New World Screwworm enters the U.S.

NWS infestations were discovered just days apart on calves that grazed
roughly 5.6 miles from each another. (Photo via Hoosier Ag News) 

Despite ongoing efforts from the U.S. Department of Agriculture, the Mexican government and on-the-ground teams along the U.S.-Mexico border, last week the USDA's Animal and Plant Health Inspection Service (APHIS) confirmed two cases of New World screwworm in Texas livestock, reports Jennifer Carrico of Progressive Farmer. In both cases, the flesh-eating blowfly larvae were discovered in young calves about 6 miles apart in Zavala County, Texas.

After the second case was confirmed, Texas Governor Greg Abbott "issued an updated statewide disaster declaration for the NWS infestation," Carrico writes. At a news conference, Abbott encouraged the use of "all state resources to combat the NWS." Additionally, the executive director of the Texas Animal Health Commission, Budd Dinges, reminded the public that NWS isn't a threat to consumer food safety but rather poses a threat to livestock production. 

In response to the infestations, APHIS has "deployed mobile response trailers, and sterile fly releases are underway with 2 million aerially and 4 million released on the ground per week," Farm Journal reports. "Movement control zones have been activated at a 20-kilometer (12.4-mile) radius around each site."

Both NWS cases were found in Zavala, Texas, 
in red above. (Wikipedia map)

The discovery prompted the Canadian Food Inspection Agency to place "temporary restrictions on livestock imports from Texas," reports C.J. Miller of Hoosier Ag Today. "Under the order, cattle, horses and other livestock that originated in Texas or were present in the state within 21 days before entering Canada will be denied entry."

Although the USDA intensified its battle to prevent the NWS from reentering the U.S. including banning Mexican livestock from entering the U.S. beginning in July 2025, some ranchers don't think the government's response was enough.

"On Friday, about 100 ranchers in mud-splattered boots and cowboy hats packed a small high school cafeteria for a Texas Animal Health Commission briefing on screwworm, peppering officials with questions and venting frustration over what they saw ​as a slow federal response,” reports Heather Schlitz of Reuters. 

Even as the USDA works to contain NWS infestations, they are likely to spread throughout the summer months, Miller reports. Prior to last week, the NWS hasn't been found in the U.S. for at least 60 years.

New World Screwworm inches closer to the Texas border; flesh-eating larvae can be deadly to cattle

Brahman cows graze near Mercedes, Texas, about 11 miles 
from the Mexico border. (Photo by J. Carrico, Farm Journal)

After a few months of reduced sightings, the New World Screwworm is making news again. "Mexican authorities confirmed an NWS case in a seven-year-old bovine and a 6-day-old calf both on Jan. 5," reports Jennifer Carrico of Progressive Farmer. Both infected animals were less than 220 miles from the U.S.-Mexico border.

Despite efforts by the U.S. Department of Agriculture and Mexican authorities, NWS has inched closer to the Texas border. The parasite has spread north even as Mexico has strictly limited cattle movement across the country.

Texas Agricultural Commissioner Sid Miller told Carrico, "The screwworm now may be moving closer on its own, with no apparent link to commercial animal movement. Texas producers must act now -- stay informed, stay vigilant, and prepare immediately. We cannot drop our guard for even a moment."

NWS flesh-eating larvae can be deadly to cattle and other warm-blooded animals, including sheep, horses and dogs. Female NWS deposit their eggs in an animal's open wound, and once the larvae hatch, they eat away at the host's flesh, which can cause infection and decay. "The larvae can kill an animal in just four to seven days if not quickly detected and treated," reports Stump Denton of Farm Journal.

Since female NWS mate only once in a lifetime and store their fertilized eggs, releasing millions of sterile male NWS has been the best way to eradicate harmful larvae production. Carrico explains, "The USDA eradicated NWS from the United States in 1966 using the sterile insect technique, and it was used successfully again in 2016 in the southern Florida Keys when found in deer."

A sterile fly distribution facility at Moore Airbase in Edinburg, Texas, is expected to be up and running early this year.

Closing the border for cattle trade hurts American and Mexican livestock managers

Cattle handlers on both sides of the U.S.-Mexico border
are struggling. (Photo by Marc Hardy via Farm Progress)

The resurgence of the New World screwworm blowfly and its flesh-eating larvae over the summer prompted the U.S. Department of Agriculture to shut down live cattle trade between the U.S. and Mexico in July. The closed border has hobbled businesses in both countries.

Feedlot owners in Texas, who make their living caring for Mexican cattle after they pass through the U.S. port of entry, have seen their herd sizes and incomes dwindle. Jennifer Carrico of Farm Progress reports, "Mark Rogers, owner of Rogers and Sons, Ltd. Custom Cattle Feeders in Dimmitt, Texas, has fed Mexican cattle for over 25 years. The border closure has lowered his cattle number to 70% of the feedyard's capacity compared to a year ago."

On the Mexican side of the border, Omar Gonzalez, who is Rogers' cattle broker, is also struggling. He told Carrico, "Screwworm isn't a problem up here in the Northern Plains of Mexico, and now we are having to find a place to put these cattle that normally go to the U.S."

Mexican ranchers aren't just looking for lots to hold cattle, but also for corn to feed them and packing facilities, which have typically been managed once the cattle were in the U.S.

As long as the border remains shut, the "decrease in cattle coming to the U.S. not only affects the feedyards but many others in the industry," Carrico writes. "Those who find themselves out of a job include truckers, employees at the ports of entry and those who help expedite getting the cattle to the border on the Mexican side and to the feedyards on the U.S. side."

Business owners in the U.S. and Mexico worry that the border will remain closed. Rogers told Carrico, "I'm not sure what I will do or my neighbors (will do) if the border doesn't reopen."

Texas cattle owners remain on 'high alert' as a human infection of New World screwworm is confirmed

A sterile male screwworm fly is numbered to study fly dispersal.
(USDA photo via PBS)

Despite focused efforts to prevent the flesh-eating New World screwworm parasite from entering the U.S., a human case of screwworm was confirmed on Sunday. The parasite was "detected in a person in Maryland who returned to the U.S. after traveling to El Salvador, according to the Department of Health and Human Services," reports Rebecca Falconer of Axios. 

While the HHS does not consider screwworms a significant threat to humans, American livestock farmers and the U.S. Department of Agriculture are preparing for the parasite. Cassandra Garrison, Tom Polansek and Leah Douglas of Reuters report, "Industry cattle ranchers, beef producers and livestock traders [are] already on high alert for potential U.S. infestations as screwworm has moved northward from Central America and southern Mexico."

Since November, the USDA has worked with Mexico to contain the aggressive parasite from nearing the U.S.-Mexico border, including closing cattle trade ports and having massive sterile fly releases. Last week, USDA Secretary Brooke Rollins announced plans to build a sterile fly facility in Texas to combat screwworm infestations.

Most experts believe that Texas is the most likely place for screwworms to enter the country. Reuters reports, "The USDA has estimated a screwworm outbreak could cost the economy in Texas, the biggest U.S. cattle-producing state, about $1.8 billion in livestock deaths, labor costs and medication expenses."

For a more in-depth explanation of screwworms, click here.

USDA announces a new Texas facility to push screwworms from U.S.; the insidious larvae threaten the beef industry

Screwworm infestations eat their living host's flesh.
They are painful and can be deadly. (Adobe Stock photo)

In an effort to combat the threat parasitic screwworms pose to U.S. livestock and wildlife near the U.S.-Mexico border, the Department of Agriculture announced it will "spend up to $750 million to build a facility in Texas that produces sterile flies to fight the flesh-eating livestock pest," report Tom Polansek and Leah Douglas of Reuters. The production plant will be built in Edinburg, Texas, at Moore Air Base.

USDA scientists and agricultural partners have been working diligently with Mexican authorities to push the blowfly and its flesh-eating larvae southward; however, the newly announced facility signals that those efforts may not be enough to protect U.S. cattle. Texas ranchers are "anticipating the return of screwworm for the first time in decades," Reuters reports. "The U.S. eliminated screwworm in the 20th century by flying planes over hotspots to drop boxes packed with sterile flies."

The new facility is expected to "produce 300 million sterile screwworm flies per week, according to USDA Secretary Brooke Rollins," Polansek and Douglas write. Mass numbers of sterile male blowflies work to create a buffer by out-competing the fertile male flies. Female blowflies only mate once, so when they mate with a sterile male blowfly, no screwworms can be produced.

Rollins previously predicted that "such a facility would take two to three years to build," Reuters reports. During the facility's construction, the "USDA will spend another $100 million on technologies to combat screwworm. . . and hire more mounted officers to patrol the border for infested wildlife. . . The USDA has also invested in a sterile fly production plant in Mexico that is slated to open next year."

Should screwworms return to the U.S., they could devastate the cattle industry. Polansek and Douglas explain, "An outbreak could further elevate record-high U.S. beef prices by reducing the U.S. cattle supply. Rollins told Reuters, "All Americans should be concerned."

Ag roundup: Screwworm update; Prop 12 egg suit; zoning officials close15-year-old's bait shop; disaster aid opens

Screwworm concerns closed U.S.-Mexico livestock trading 
again. (Meredith Corp. photo via Successful Farming)

Continuing its uphill battle to prevent screwworms from re-entering the U.S., the Department of Agriculture suspended its plan to "gradually resume imports through four further ports in the coming months," reports Oliver Ward of Successful Farming. "The announcement came just two days after USDA reopened a single port of entry for Mexican livestock in Douglas, Arizona."

Chickens and eggs are back in the news as the Trump administration files suit against California over its Proposition 12 egg rules that require cage-free housing for egg-laying hens. The suit claims the state's restrictions "violate the federal Egg Products Inspection Act, which it said trumps state egg regulations," reports Philip Gruber of Lancaster Farming. "California law raises egg prices for consumers by preventing farmers across the country from using standard agricultural practices that would help keep prices down, President Donald Trump’s administration said in a July 9 filing."

Max McKinney and his bait stand that officials have
now closed. (Photo by Foss Farms via Farm Journal)

At 15 years old, Max McKinney was already an entrepreneur running his own bait and snack shop until zealous county officials shut him down. McKinney’s 6’x15’ shop "was deemed a zoning violation by Washburn County, Wis., officials," reports Chris Bennett for Farm Journal. "After snapping photographs of the stand as proof of McKinney’s assault on county code, zoning officials issued a cease-and-desist letter, ordering closure under penalty of daily fines." Read how the McKinney family responded here. McKinney's bait shop isn't the only one to get zapped by rule-strapping officials.

Farmers with crops battered by natural disasters in 2023 and 2024 can now apply for USDA aid payments. "The program, referred to as the Supplemental Disaster Relief Program, will be administered in two stages," reports Lydia Johnson of Successful Farming. "The first application stage begins this week for producers with eligible crop losses caused by hurricanes, wildfires and other weather events who received assistance under crop insurance or the non-insured crop disaster assistance program. The second stage will begin in the fall for producers with eligible shallow or uncovered losses."

A Kansas district will open its ag-focused center in a remodeled grade school 
that was closed years ago. (USD 269 photo via The Daily Yonder)

After years of declining student enrollment, the Palco-Damar-Zurich school district (Unified School District 269) in western Kansas found a way to harness its farming history and grow again. "About a dozen new students have signed on, drawn by a new Ag-Focused School model and the opening of USD 269’s Northwest Kansas Agriculture Education Center program," reports Lane Wendell Fischer of The Daily Yonder. "Their vision is to provide some form of agriculture education from preschool through high school. At the elementary levels, students will be engaged in ag-related activities, lessons, and will even roll up their sleeves to do some chores."

Few people are more obsessed with the weather than farmers. While American farmers have a myriad of tools to use, many rely on the U.S. Drought Monitor to measure critical rainfall information. But the Drought Monitor also informs scientists, academics, water management experts and regular citizens about national rainfall across time. Below are examples of July Drought Monitor maps, where the difference of a year can be easily compared. 

 

An in-depth look at screwworms and the USDA response to keep the problem from spreading in the U.S.

An adult female screwworm fly can lay up to 300 eggs
at a time. (USDA photo via Offrange)

 

Hollywood horror flicks can't hold a candle to the gruesomely parasitic screwworm. The flesh-eating larvae were eradicated in the U.S. nearly 60 years ago, only to reappear in South America and then migrate back into Mexico, where the Department of Agriculture has played hardball at the border, trying to keep the insidious pest from re-entering the states.

Luckily for cattle and other mammals, the screwworm, which is a type of blowfly's larva, isn't even a particularly effective parasite because it inevitably kills its host.

Female Cochliomyia hominivorax fixate on the smell of blood from any wound as a place to "lay their eggs — up to 300 at a time. These hatch out spined maggots that anchor themselves into flesh, then proceed to eat their way through it, sometimes deep into muscle," reports Lela Nargi of Offrange. "If it’s deep enough, the host animal cannot survive."

The USDA continues to use a multi-pronged approach to control screwworms:

• In May, U.S. Secretary of Agriculture Brooke L. Rollins suspended the import of live cattle, horses, and bison through U.S. ports of entry along the Mexican border, aiming to curtail entry possibilities while providing time to prepare and counter any screwworm infestations. While Rollins announced a phased reopening of the southern ports this July, the plan comes with heightened and constant monitoring.
• The plan includes the incremental release of thousands of sterile male screwworm producers with heavy monitoring by U.S. and Mexican scientists. The mass numbers of sterile screwworm-producing blowflies work to create a buffer by out-competing the fertile male flies. Since a female screwworm blowfly can only mate once in a lifetime, when she mates with a sterile male blowfly it insures that her eggs will never hatch -- no matter how many eggs she lays.
• Experts can also trap and measure the ratio of sterile to fertile male screwworm producers in different areas. Sterile releases aim to overwhelm the wild population, which scientists can also measure through traps.
• The USDA also employs teams affectionately known as "tick cowboys" who patrol borders on horseback, looking for any signs of illness in herds. By scouting for any cattle that appear distressed, the USDA can quickly detect, contain, and report any screwworm (or other) infestation.

An active screwworm infestation can be treated and cured, but like the worms themselves, it's "disgusting," Nargi writes. "The maggots have to be removed before the wound is cleaned and sutured." 

Screwworms do have a natural enemy -- fire ants. Nargi writes, "Unsurprisingly, no one is talking about dispersing more fire ants to eat the screwworms."

Experts are already hard at work helping livestock owners get prepared. Philip Kaufman, an entomologist at Texas A&M, "helped compile a new screwworm fact sheet that’s being distributed to ranchers," Nargi reports. "He isn’t prone to screwworm pessimism." He told her, "We are concerned, but we are not in a crisis. People are getting trained up and we’re gonna tackle this and solve it again."

Sharing any suspicious findings is key. Kaufman told Nargi, "Reporting is the number one thing people can do. If you ignore this, that fly population is just going to get bigger and bigger and cause more of a problem for everybody else. This is a community issue.”

If you get bitten by a tick, save it -- and other tips for dealing with ticks' ever-spreading presence

Illustration of a tick biting. 
(Art by Sebastian Kaulitzki, Adobe Stock)

What's to like about ticks? They are an important food source for wildlife, such as birds, lizards and bats. What's not to like? For humans, the list is long. 

Ticks can carry and spread more than 12 different "disease-causing agents including toxins, allergens, bacteria, parasites and viruses," reports Pien Huang of NPR. Across the U.S., some 31 million people are bitten by ticks every year.

Although not every tick bite ends in disease, many do. "Most reported cases of vector-borne disease (including mosquitoes) come from ticks, which can carry pathogens with terrible consequences," Huang explains. "Lyme disease is the most common tick-borne disease in the U.S., estimated to affect more than 470,000 people each year."

When it comes to ticks, working to avoid contact is the first line of defense; however, knowing what to do if you find one attached or have suspicious symptoms such as a rash is just as important.

If you find a tick attached, remove it immediately, but place it in a plastic bag or container it can't escape. Huang writes, "Identifying some key information about the tick can help determine your risks. That includes what kind of tick it is, whether it's in the nymph or adult stage and how long it's been feeding on you." 

The University of Rhode Island's website contains tick identification tools and instructions on how to submit the tick's photo to a tick-tracking expert.

An engorged deer tick. (CDC photo)

The ever-growing list of diseases ticks carry often depends on geography, although warming temperatures have led some tick species to spread into new regions. "In the past 20 years, scientists have discovered at least seven new tick-borne pathogens in the U.S.," Huang reports. "The mid-Atlantic recently saw its first fatal case of Heartland Virus."

For people heading outdoors, Huang provides this tick-avoiding guidance from CDC experts:

• Do careful and frequent tick checks on yourself and your family members and pets.
• If you're hiking, it helps to stay in the middle of a well-maintained trail, since ticks tend to hang out in the shrubs and foliage around the edge.
• Treat outdoor clothing with permethrin, a chemical similar to chrysanthemum extracts that stops ticks from biting.
• Additionally, treat your exposed skin with EPA-registered insect repellents containing DEET, picardin, or other active ingredients that deter ticks. (Use the EPA's search tool to find one that works.)

Farm updates: Eradicating screwworms; air detecting for bird flu; John Deere suit continues; Farm Dog of the Year!

Tusk-like mandibles can rasp the flesh of living warm-
blooded animals. (USDA photo via Successful Farming)

Despite its eradication from the U.S. in 1966, the New World Screwworm has returned to Mexico, which means the aggressive, flesh-eating flies could re-enter the U.S. 

While the NWS could prey on any warm-blooded animal, its return would be devastating for the U.S. cattle industry. Angie Stump Denton reports for Farm Journal, "The larvae can kill an animal in just four to seven days if not quickly detected and treated."

Experts believe Texas would be the most likely place for NWS to enter the U.S. from Mexico. In late April, after Agriculture Secretary Brooke Rollins threatened to suspend cattle imports from Mexico to the U.S. as she did in November 2024, the two countries were able to agree on a strategy to control the NWS. Listen to more details on the NWS and USDA approaches for "complete eradication" here.

New bird flu detection sensors are fast. By testing air from exhaust vents, the systems monitor for
 bird flu 24/7. (ASC Publications graphic)

Bird flu remains a significant concern for egg and poultry industries as well as backyard and small chicken or turkey farms. The virus presents numerous difficulties, one of which is a lack of "any 'early warning' system," reports Alfred Poor for Offrange. "Testing requires a lab and can take days to deliver results. … A new detection technology can produce results in minutes and is designed to be installed on-site, right in the flock housing buildings, to provide continuous monitoring. … The system samples air from the exhaust vents from the animals’ housing. The researchers have described their results in a paper in ACS Sensors."

The new detection technology doesn't require any technical training to run and it's accurate. Poor adds, "According to the team’s own published results, the system’s results showed a 90% correlation with the standard PCR lab results."

Even though U.S. farmers can now legally repair their tractors, a lawsuit addressing John Deere's past repair policies and tactics with farmers will still make its way through the court system. "The Agriculture equipment giant must face a lawsuit by the U.S. Federal Trade Commission accusing the company of forcing farmers to use its authorized dealer network and driving up their costs for parts and repairs," reports Mike Scarcella of Reuters. "U.S. District Judge Iain Johnston in the federal court in Rockford, Illinois, ruled for now to reject Deere’s effort to end the lawsuit."

Deere countered the suit saying that "it does not compete in the market for repair services," Scarella reports. "The company also challenged the lawfulness of the structure of the FTC. … Deere alleged that restrictions against removing FTC commissioners illegally bar the president from exercising lawful oversight."

We don't know how we missed it, but it's our pleasure to introduce "Sirius," the amazing and lovable 2025 Farm Bureau Dog of the Year. "Livestock guardian dog Sirius is a 'hero behind the heroes' – a herd of miniature therapy horses that bring comfort to those who have experienced traumatic events," the American Farm Bureau Federation reports. 

The mini-horses that Sirius and his fellow Maremma sheep dogs help protect from behind the scenes have given people joy during some of their worst experiences. They visited families after the Sandy Hook school shooting and comforted victim families and first responders after the Pulse Nightclub shooting. They make people smile and laugh in children and veteran hospitals wherever they go. 

While Sirius and his fellow canine guardians stay home at the farm, they help owners Jorge and Debbie Garcia-Bengochea know the horses are safe. Jorge told FB, "The Maremma breed is intended to bond with the herd. When these dogs are on alert and watching the herd, I feel like it's a  24/7 security system."

Farmers are encouraged to enter their tremendous farm dog here for the 2026 award.

Quick hits: Bakery sign debate; global cheese demand; Marlboro man's mystique; discover the Stargazer Highway

Local art students created the bakery sign, but a code enforcement 
officer said it had to come down. (Leavitt's Country Bakery reel photo)

Even in closely-knit small towns, not everyone gets along. In Conway, New Hampshire, town officials and Sean Young, a bakery business owner, have been in a legal dust-up since Young installed a front signage mural made by local high school students. "But the town of Conway told Young the painting wasn’t a mural, it was a sign that exceeded the town’s legal size limit and would need to be taken down," reports Kyle Melnick of The Washington Post. "Young left the mural up, and sued the town the following year, claiming its ordinance violates the First Amendment." In May, a judge ruled that Leavitt’s Country Bakery sign, with its giant muffins, donuts and beaming sun, could stay.

The love of cheese products is going global, which is good news for American dairy farmers. "While domestic cheese sales remain soft, global cheese demand is accelerating rapidly," reports Taylor Leach of Daily Herd Management. "Much of that growth is coming from international restaurant menus that are incorporating cheese in new and creative ways. . . . Beyond cheese, other dairy products are gaining traction in international markets as well. Whey proteins and milk proteins, in particular, are seeing increased demand across Asia."

The Marlboro man 'was always adaptable to the times.'
(Philip Morris ad via MEL magazine)

Despite the illness and death cigarette smoking has caused, the Marlboro man remains a strong, stoic, and unequivocally American icon. "The Marlboro man was something of a chameleon, in that he took on multiple meanings and was always adaptable to the times — which, more than anything else, speaks to the durability of the cowboy in American culture," reports Brian VanHooker for MEL magazine. VanHooker shares the storied history of one of the most successful ad campaigns in U.S. history. "Twenty years later, while the Marlboro Man may evoke a sense of nostalgia for some due to its beautiful imagery of the West, for so many who have had a loved one die from smoking-related illnesses, he has a much darker legacy."

Department of Agricultural Secretary Brooke Rollins announced a listing of new Farm Service Agency and Rural Development state directors tasked with implementing the Trump administration's rural agenda. During her announcement, Rollins told reporters, "Our latest additions to the USDA family are personally invested in ensuring farmers and rural America prosper." Mariah Squire of Successful Farming provides a by-state listing of new appointees, with a limited look at their professional backgrounds.

The dark night skies of the Black Canyon in Gunnison National Park, Colorado.
(Photo by G. Owens, National Park Traveler)

America's National Parks offer visual experiences rarely found in other places. A group of photographers wanted to understand more about Native American spiritual history, so they set out across the National Park's path known as the "Stargazer Highway," Eric Jay Toll writes for National Park Traveler. "More than a dozen tribes have traditional lands through which the Stargazer Highway passes, and each has sacred tribal legends explaining the stars in the skies and lessons, consequences, and morals on Earth. . . . These stories [are] along the highway, better known as U.S. 191, and many of its side roads. The road runs 1,545 miles from Mexico to Canada through Arizona, Utah, Wyoming, and Montana, passing 24 national parks, monuments, and tribal parks."

IQOS is marketed as sophisticated and 'safer' than
burned tobacco. (Adobe Stock photo)

Phillip Morris has a slick-looking new tobacco product hitting U.S. markets. "The chicly futuristic branding of IQOS, a heated tobacco product owned by Philip Morris International, is one of several things worrying researchers and anti-tobacco advocates," reports Sarah Todd of STAT. "The company is rolling out pilots of the device. . . peddling IQOS (pronounced “eye-koss”) as the 'next step in tobacco harm reduction.' The company positions the devices as a better alternative for smokers compared to cigarettes." Health advocates don't agree with the company's sales pitch and say that savvy IQOS marketing could convince some people to start an unhealthy, addictive habit. 

Ticks can transmit diseases to humans.
(CDC photo)

The problem with ticks isn't that they look creepy; they spread illnesses with alarming efficiency. Every summer it's good to review the best ways to avoid and if needed, remove hitchhiker ticks. "These vile little creatures transmit Lyme disease, babesiosis, anaplasmosis, Rocky Mountain spotted fever, and ehrlichiosis, among others, and symptoms can range from swollen joints to meat allergies," report Annemarie Conte and Doug Mahoney of Wirecutter. Click here to read "their favorite picks and the advice to keep in mind as you head outdoors this summer."