Evaluation of Current Tarnished Plant Bug (Hemiptera: Miridae) Thresholds in Transgenic MON 88702 Cotton Expressing the Bt Cry51Aa2.834_16 Trait

被引:9
作者
Corbin, J. C. [1 ]
Towles, T. B. [1 ]
Crow, W. D. [2 ]
Catchot, A. L. [1 ]
Cook, D. R. [2 ]
Dodds, D. M. [3 ]
Gore, J. [2 ]
机构
[1] Mississippi State Univ, Dept Biochem Mol Biol Entomol & Plant Pathol, Mississippi State, MS 39762 USA
[2] Mississippi State Univ, Delta Res & Extens Ctr, Stoneville, MS 38776 USA
[3] Mississippi State Univ, Dept Plant & Soil Sci, Mississippi State, MS 39762 USA
基金
美国食品与农业研究所;
关键词
IPM; lygus resistant; Bacillus thuringiensis; HETEROPTERA-MIRIDAE; INSECTICIDE RESISTANCE; POPULATIONS; IMPACT; ACEPHATE; YIELD;
D O I
10.1093/jee/toaa075
中图分类号
Q96 [昆虫学];
学科分类号
摘要
The tarnished plant bug, Lygus lineolaris (Palisot de Beauvois), is an important pest of cotton in many areas of the southern United States. An experiment was conducted at two locations in Mississippi during 2016 and 2017 to evaluate action thresholds for tarnished plant bug on a novel Bacillus thuringiensis cotton that expresses the Cry51Aa2.834_16 toxin. Treatments included the current action threshold, a 2x threshold, and treatments where insecticides were only applied during the early season (preflower) or only during late season (during flowering) based on the current action thresholds.These were compared to an untreated control and a weekly insecticide use regime that received weekly insecticide sprays. All treatments were imposed on both Bt Cry1Aa2.834_16 cotton and a nontraited cotton. The Bt Cry1Aa2.834_16 trait reduced the number of tarnished plant bugs and injury, and improved yields compared to nontraited cotton. For all spray treatments except the weekly insecticide use regime, yields were greater for the Bt Cry51Aa2.834_16 cotton than the nontraited cotton. In terms of thresholds, Bt Cry1Aa2.834_16 cotton sprayed based on current action thresholds resulted in similar yields to the weekly insecticide use regime of both cotton types. In contrast, the 2x threshold resulted in lower yields than the current threshold for both cotton types. Though thresholds intermediate to the currently recommended action threshold and the 2x threshold were not tested, these data suggest that currently recommended action thresholds appear appropriate for Bt Cry51Aa2.834_16 cotton. These results suggest that this trait will be an important component of current IPM programs in cotton where tarnished plant bug is an important pest.
引用
收藏
页码:1816 / 1822
页数:7
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