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Q&A ViewAttendees 2

Plant-Insect Ecosystems

Student Competition 10-Minute Paper

Grad P-IE: IPM - Field Crops 1

Dosage response of Chrysodeixis NPV (ChinNPV) and the impact of larval infection of ChinNPV on soybean, Glycine max , defoliation

Monday, November 1, 2021
9:00 AM - 9:12 AM MT
Location: Colorado Convention Center, Four Seasons Ballroom 1
In-Person Student Competition
Synthetic insecticides are the most common and reliable control method for soybean looper, Chrysodeixis includes . With documented resistance to pyrethroids organophosphates, and variable control with carbamate insecticides, nucleopolyhedrovirus (NPV) is a possible alternative to synthetic insecticides. Multiple experiments were conducted in 2020 at the University of Arkansas Lonoke Research and Extension Center to evaluate the impact of ChinNPV infection on soybean looper.
For the first experiment a diet-overlay assay was conducted using ChinNPV rates, 2 (4.4x1011 OB), 2.5 (5.5x1011 OB), 3 (6.6x1011 OB), 3.5 (7.7x1011 OB), 4 (8.8x1011 OB) oz/ac. Each rate was evaluated daily on 1st, 3rd,4th, 5th, 6th instar larvae for mortality. A rate response was observed for 3rd, 4th, and 5th instar larvae but not 1st or 6th. In the second experiment, soybean loopers were caged on soybean treated with 2.5, 3, 3.5, 4 oz/a ChinNPV in the greenhouse. Percent defoliation of the soybean plants and larval mortality were recorded daily. At 8-14 DAT, all ChinNPV rates significantly reduced defoliation but less than 50% larval mortality was recorded. These studies will help us determine the utility, recommended dosage, and control expectation for ChinNPV on soybean looper.