Aphids make Early Appearance in Kansas Alfalfa Fields

Apr 20, 2022

By Shelby Varner

Kansas State University crop entomologist Jeff Whitworth said he has received numerous calls from farmers who are already seeing cowpea and pea aphids in their alfalfa fields.

The aphids, he said, are probably in every field in Kansas, but “we usually do not see this many of them this early.”

He said the cowpea aphid population desnity that producers are seeing now is more typical of June or July, usually with the second or third alfalfa cutting.

“Alfalfa is a good host for beneficial insects, so when we see lady beetles over winter and they start going around feeding they’ll find some cowpea aphids or pea aphids because they arrive early in the season,” Whitworth said.

Because of that, he adds, “I still have a hard time recommending treating for aphids, whether they’re cowpea aphids or pea aphids."

Whitworth said many producers worry about the honeydew on alfalfa plants that cowpea aphids produce. “If you’re really worried about them, I really don’t think there’s a specific percentage that creates the need for the aphids to be treated,” he said.

If a producer decides to treat for aphids, Whitworth said they may want to consider one of the new insecticides that are labeled for alfalfa aphids.

“If producers leave them untreated, I think the beneficial insects will find them and start helping to control them a little bit,” Whitworth said.

According to Whitworth, spraying for alfalfa weevils will also kill the aphid populations.

He said that a producer should choose to spray alfalfa weevils once the weevils are found on at least 50% of the alfalfa plants.

Whitworth said that the alfalfa plant does not need to be luscious on top when spraying alfalfa weevils because the treatment should still be effective in decreasing or eliminating alfalfa weevils from the field.

Source : k-state.edu

Video: Why Your Food Future Could be Trapped in a Seed Morgue

In a world of PowerPoint overload, Rex Bernardo stands out. No bullet points. No charts. No jargon. Just stories and photographs. At this year’s National Association for Plant Breeding conference on the Big Island of Hawaii, he stood before a room of peers — all experts in the science of seeds — and did something radical: he showed them images. He told them stories. And he asked them to remember not what they saw, but how they felt.

Bernardo, recipient of the 2025 Lifetime Achievement Award, has spent his career searching for the genetic treasures tucked inside what plant breeders call exotic germplasm — ancient, often wild genetic lines that hold secrets to resilience, taste, and traits we've forgotten to value.

But Bernardo didn’t always think this way.

“I worked in private industry for nearly a decade,” he recalls. “I remember one breeder saying, ‘We’re making new hybrids, but they’re basically the same genetics.’ That stuck with me. Where is the new diversity going to come from?”

For Bernardo, part of the answer lies in the world’s gene banks — vast vaults of seed samples collected from every corner of the globe. Yet, he says, many of these vaults have quietly become “seed morgues.” “Something goes in, but it never comes out,” he explains. “We need to start treating these collections like living investments, not museums of dead potential.”

That potential — and the barriers to unlocking it — are deeply personal for Bernardo. He’s wrestled with international policies that prevent access to valuable lines (like North Korean corn) and with the slow, painstaking science of transferring useful traits from wild relatives into elite lines that farmers can actually grow. Sometimes it works. Sometimes it doesn’t. But he’s convinced that success starts not in the lab, but in the way we communicate.

“The fact sheet model isn’t cutting it anymore,” he says. “We hand out a paper about a new variety and think that’s enough. But stories? Plants you can see and touch? That’s what stays with people.”

Bernardo practices what he preaches. At the University of Minnesota, he helped launch a student-led breeding program that’s working to adapt leafy African vegetables for the Twin Cities’ African diaspora. The goal? Culturally relevant crops that mature in Minnesota’s shorter growing season — and can be regrown year after year.

“That’s real impact,” he says. “Helping people grow food that’s meaningful to them, not just what's commercially viable.”

He’s also brewed plant breeding into something more relatable — literally. Coffee and beer have become unexpected tools in his mission to make science accessible. His undergraduate course on coffee, for instance, connects the dots between genetics, geography, and culture. “Everyone drinks coffee,” he says. “It’s a conversation starter. It’s a gateway into plant science.”