ESA Southeastern Branch Meeting Online Program

Evaluation of transgenic corn containing single or pyramided Bt genes against Cry1F-susceptible and -resistant fall armyworm

Tuesday, March 5, 2013
Hilton Baton Rouge
Ying Niu , Department of Entomology, Louisiana State University Agricultural Center, Baton Rouge, LA
Robert Meagher , Behavioral and Biological Control Unit, USDA - ARS, Gainesville, FL
Fei Yang , Department of Entomology, Louisiana State University Agricultural Center, Baton Rouge, LA
Vikash Dangal , Department of Entomology, Louisiana State University Agricultural Center, Baton Rouge, LA
Fangneng Huang , Department of Entomology, Louisiana State University Agricultural Center, Baton Rouge, LA
Multiple greenhouse trials were conducted to evaluate larval survival and plant injury of Cry1F-susceptible (SS), -resistant (RR), and –heterozygous (RS) genotypes of the fall armyworm (FAW), Spodoptera frugiperda on nine corn hybrids. The nine hybrids included three non-Bt, two single-gene Bt (Herculex® I and YieldGard® corn borer) and four pyramided Bt (Genuity® VT Double ProTM, VT Triple ProTM, SmartStaxTM, and Agrisure® VipteraTM ) corn products. Larvae of the three insect genotypes on non-Bt corn plants caused an average leaf injury rating (Davis’ 1 to 9 scales) of 8.8-9.0 after 15 days. Leaf injury rating of SS and RS on Herculex® I was 1 to 2.4, but it was high (8.4) for RR larvae. Leaf injury rating on the four pyramided corn products was low, < 2.5. After 15 days, live larvae were observed in 37.5-75.0% of non-Bt plants. For Herculex® I plants infested with RR larvae, this number was 43.8%. In contrast, survival rate on the four pyramided Bt corn products was low regardless of the insect genotype. The results showed that the Cry1F-RR FAW was highly resistant to Cry1F corn, but it was still susceptible to the four pyramided Bt corn products.
See more of: Poster Presentations:  Plant-Insect Ecosystems - Resistance Management, Transgenic Crops
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