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Q&A ViewAttendees 3

Plant-Insect Ecosystems

10-Minute Paper

P-IE: IPM - Field Crops

Chemigation efficacy of applied insecticides for western bean cutworm (Striacosta albicosta) management in corn

Tuesday, November 2, 2021
1:54 PM – 2:06 PM MT
Location: Colorado Convention Center, Meeting Room 102-106
In-Person

Western bean cutworm (WBC) is a native insect in North America which is recognized as an economically important pest of corn and dry beans in Nebraska. Larval feeding on corn ears can cause significant yield loss. Therefore, the majority of corn growers apply insecticides by airplane targeting this pest, while some of them apply insecticides by central pivot irrigation which is known as chemigation. Information about efficacy of chemigation for control of WBC is scarce. For that reason, two years of field studies were conducted to determine the efficacy of chemigation using different insecticides on the control of WBC. Bifenthrin and chlorantraniliprole were used at their highest (6.4 and 20 fl oz/ac) and lowest label rates (2.1 and 14 fl oz/ac) and applied through central pivot irrigation at two carrier volumes of water (0.25 and 0.75 acre-inches). Plastic jars positioned within each plot were used to collect chemigation samples. Plots were scouted for the presence of live or dead WBC adults, eggs, and larvae by destructive sampling of 10 plants per plot at 7, 14, and 21 days after treatment (DAT). At 28 DAT, 10 ears per plot were collected and assessed for the presence and size of larvae and the amount of feeding damage (cm2) was measured. The percent of infested ears, amount of feeding, and potential yield loss was compared between all treatments.