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ViewAttendees 8

P-IE

Student Competition 10-Minute Paper

Grad 10-min: P-IE, IPM Field Crops 1

Evaluating the economic threshold of determinate and indeterminate soybeans

On-Demand
Student Competition On-Demand
Helicoverpa zea (Boddie) is one of the most serious pests that impact soybeans. Current economic injury thresholds for H. zea are based on determinate soybeans. The objective of our study is to investigate whether the economic injury level for H. zea is the same between determinate and indeterminate soybeans using four varieties of determinate and indeterminate soybeans that are closely related. During 2019 and 2020, paired determinate and indeterminate soybean plots where sampled across eight locations in North Carolina and Arkansas. Field plots where manipulated with insecticides to create a check, low, medium, and high infestation level of H. zea. During infestation, weekly samples of larval where taken along with damaged flowers and pods. At harvest, yield results were taken as well as number of seeds per pod, seed weight, and pods per plant. We then investigated how determinate and indeterminate soybeans compensate to H. zea damage. The information from this study will be used to determine if a new economic injury threshold is needed for indeterminate soybeans.