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Plant-Insect Ecosystems

Student Competition Poster

Grad P-IE: IPM 1 - Field Crops, General, and Horticulture

D3050: Larval distribution of soybean gall midge in soil from infested soybean plants

Monday, November 1, 2021
9:00 AM – 6:30 PM MT
Location:: Exhibit Hall F
Student Competition In-Person Poster
The soybean gall midge (SGM), Resseliella maxima Gagné (Diptera: Cecidomyiidae), was recently identified as a new pest on soybean. Adults lay eggs at the base of the stem where the larvae feed resulting in a dark discoloration of the stem. Mature larvae exit the stem and form cocoons in the soil. Since this insect was only recently identified, much of the biology and ecology of SGM is still unknown. As a result, a two-year field study is being conducted in Lancaster County, NE to understand the moment of SGM larvae from a host plant prior to pupation. The study consists of two soybean rows 30 meters long, planted parallel to the field edge adjacent to another site that was infested with SGM in the previous year. No soybean or other plants will be present perpendicular to these two rows for 6.5 meters. Soil samples will be collected at 1-8, 10-17, 20-27, 40-47, 80-87, 160-167, 300-307, and 600-607 cm in both directions from the soybean rows. Larvae and cocoons will be isolated using a brine extraction technique. The number of larvae and cocoons will be counted at a dissecting scope. Data from 2020 showed the presence of SGM larvae up to three meters away from the soybean row, however, further studies are needed to validate this result. These results increase the understanding of the spatial distribution of larvae under field conditions as well as potential limitations evaluating adult emergence from small plot field research.