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Q&A ViewAttendees 2

Plant-Insect Ecosystems

Student Competition 10-Minute Paper

Grad P-IE: Education and Extension

Comparison of transgenic Bt technologies in Arkansas cotton systems for control of cotton bollworm, Helicoverpa zea

Monday, November 1, 2021
10:42 AM - 10:54 AM MT
Location: Colorado Convention Center, Meeting Room 207
In-Person Student Competition

One of the widely used methods of controlling cotton bollworm (Helicoverpa zea) in cotton is the use of transgenic Bt technologies. Resistance has recently been documented in cotton bollworm to two gene cotton cultivars and commonly, additional foliar applications must be made to protect cotton yield. There is some evidence that, while more efficacious against bollworm, three gene cotton cultivars yield less than two gene cultivars. Due to this yield gap, growers could have greater profits using two gene cultivars despite the possible need for foliar applications. Research was conducted in 2020 in Desha County, Arkansas to evaluate the efficacy of several Bt technologies. In this trial unsprayed three gene cultivars had similar levels of damage as the two gene cultivar when sprayed with Vantacor at 1.71 oz/a. Results indicate that dual gene cultivars may require supplemental foliar applications to manage high populations of bollworm.