Kansas agricultural officials and researchers are intensifying efforts to monitor the spread of the invasive corn leafhopper after confirmed detections in neighboring Oklahoma raised concerns about the potential threat to the state’s corn crop.
Through a partnership between Kansas Corn and Kansas State University, farmers across Kansas will benefit from expanded surveillance programs and free diagnostic testing aimed at identifying corn leafhoppers and the pathogens responsible for corn stunt disease before they become widespread.
Although corn leafhoppers and the destructive corn stunt spiroplasma pathogen have not yet been detected in Kansas during the 2026 growing season, agricultural experts are taking no chances. The pest has already been confirmed in both Texas and Oklahoma, increasing concerns that it could eventually move northward into Kansas corn-producing regions.
According to plant pathologist Rodrigo Onofre, early detection remains the best defense against the invasive insect.
The statewide monitoring initiative, funded by Kansas Corn, enables researchers to track leafhopper movement, analyze insect and plant samples, and provide farmers with real-time updates throughout the season. The program also offers free laboratory testing for suspected corn leafhoppers, infected insects, and corn plants showing symptoms associated with corn stunt disease.
Building on the success of the Kansas Corn Disease Network launched in 2025, the monitoring effort has expanded significantly this year. Researchers have established 35 trapping sites across Kansas, where specialists have been collecting and analyzing samples weekly since mid-April. Monitoring will continue for approximately 40 weeks, allowing experts to follow insect migration patterns throughout and beyond the growing season.
The collaborative network includes university researchers, Extension specialists, crop consultants, and industry partners working together to provide a clearer picture of emerging disease threats. Additional support comes from agronomy and entomology departments, local crop consultants, Extension offices, and agricultural technology companies.
As part of the surveillance effort, every captured corn leafhopper will be tested for pathogens linked to corn stunt disease. Confirmed findings will be added to publicly available risk maps, helping producers and agricultural advisers make informed management decisions based on local conditions.
The network is also tracking other significant corn diseases, including tar spot and southern rust, which continue to pose risks to crop production across the region.
Researchers are urging growers to remain vigilant while scouting fields. Corn leafhoppers are small insects measuring roughly one-eighth of an inch in length and can be identified by two distinctive dark spots located between their eyes. However, specialists warn that several harmless leafhopper species closely resemble the invasive pest, making laboratory confirmation essential.
Entomology expert Anthony Zukoff emphasized that proper identification is critical because not all leafhopper species transmit corn stunt pathogens. Farmers who suspect they have found corn leafhoppers are encouraged to submit samples rather than relying solely on visual identification.
The concern is heightened by the limited options available for controlling the pest. Research conducted in Oklahoma and Texas during 2025 found that many broad-spectrum insecticides provided only temporary suppression and were generally ineffective at preventing repeated invasions of adult leafhoppers. Furthermore, chemical treatments cannot cure corn plants already infected with corn stunt disease, making prevention and early detection the most effective strategies.
Kansas researchers are also drawing on lessons learned from last year’s surveillance efforts. During the 2025 season, corn leafhoppers were detected in 31 Kansas counties, while the corn stunt pathogen was found in 25 counties, though disease levels remained relatively low. Winter monitoring conducted after harvest found no evidence that the insects survived Kansas winter conditions, offering some encouragement heading into 2026.
To strengthen preparedness, Kansas State University continues to provide free testing services for farmers, crop consultants, and Extension professionals. Participants can submit insect samples or symptomatic corn tissue for laboratory analysis, helping researchers track potential outbreaks while giving producers valuable information to protect their crops.
With Oklahoma detections serving as an early warning sign, Kansas officials say the expanded monitoring network will play a crucial role in safeguarding corn yields and ensuring growers receive timely, science-based guidance as the season progresses.
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