10/01/2026
Thursday Industry Insight: Mealybugs
Cooper Larson || KRIRM Graduate Student
Pasture mealybugs are an emerging threat to pasture and hay production in the southern United States, particularly in Texas, Louisiana, and Florida. Juvenile mealybugs feed on grasses by sucking plant sap, but most of the damage comes from the saliva they inject into the plant. This can result in yellowing, red or purple discoloration, stunted growth, poor root development, premature leaf death, and eventually plant mortality. Infested pastures may appear drought-stressed even when rainfall is adequate.
Mealybugs can damage economically important forage grasses, including bermudagrass, Bahia grass, buffel grass, and other pasture species. Mealybugs may occur beneath leaves, within thatch, and near or below the soil surface, making detection and control difficult. Movement of contaminated hay, mowing equipment, and potentially livestock can contribute to the spread of pasture mealybugs between fields.
Control efforts are still under evaluation. Pasture mealybugs thrive in tall, dense forages; thus, grazing and mowing may reduce insect populations in combination with a subsequent chemical application. One challenge for chemical control is the lack of adequate coverage in tall, dense forage stands. Two chemicals, Centric 40WG and Sefina Inscalis, have shown progress in reducing, but not eliminating, mealybug populations. Products with the active ingredients of fipronil or pyrethroids are not effective in control of the pasture mealybug.
For more information, visit Texas A&M AgriLife Extension:
https://agrilifeextension.tamu.edu/pasture-mealybug/
Photo Credit: Texas A&M AgriLife Extension Service