ESA Annual Meetings Online Program

0527 Occurrence and larval movement of sugarcane borer, Diatraea saccharalis (F.) in mixed plantings of corn expressing pyramided Cry proteins

Monday, November 14, 2011: 9:15 AM
Room A16, First Floor (Reno-Sparks Convention Center)
David Sindani Wangila , Department of Entomology, Louisiana State University AgCenter, Baton Rouge, LA
B. Rogers Leonard , LAES Administration, Louisiana State University, Baton Rouge, LA
Mukti N. Ghimire , Department of Entomology, Louisiana State University AgCenter, Baton Rouge, LA
Karla D. Emfinger , Department of Entomology, Louisiana State University AgCenter, Winnsboro, LA
Liping Zhang , Department of Entomology, Louisiana State University AgCenter, Baton Rouge, LA
Yaoyu Bai , Department of Entomology, Southwest University of China, Beibei, China
Fei Yang , Entomology, Louisiana State University, Baton Rouge, LA
Graham P. Head , Global IRM Strategy Lead, Monsanto Company, St. Louis, MO
Fangneng Huang , Department of Entomology, Louisiana State University, Baton Rouge, LA
Three independent trials were conducted to evaluate larval movement and occurrence of sugarcane borer (SCB), Diatraea saccharalis (F.), (evaluated in 2009-2011) in four seed mixture planting patterns for pyramided Bt corn, SmartStaxTM: (1) open fields with natural insect populations (2009), (2) open fields with artificial infestations of 50 SCB eggs on center plants (2011), (3) greenhouse studies with artificial infestations of 50 SCB eggs on the center plants (2010-2011). Number of live SCB in the other trials was checked 21-27 days after infestations. There were no significant differences in number of larvae/pupae observed between the central non-Bt plants in T2 and T3. Furthermore, no significant differences in SCB occurrence among the central non-Bt plants in T2 and the non-Bt plants in T3 in trial 1. Natural SCB infestations in the trial site were not observed during 2011, thus artificial infestations were employed in the open field. An average of 2.0 and 2.4 surviving larvae/ plant were recovered from the center non-Bt plants 21 days after egg infestation in T2 and T3, respectively. In the greenhouse tests, 10.9 and 6.9 larvae survived in center non-Bt plants after 21 days in T2 and T3. In both trials 2 and 3, no larvae were found in the center Bt plant in both T1 and T4. A limited number (0.5-4.3 insects) of larvae moved from center non-Bt /Bt plants to adjacent non-Bt plants. Results of this study suggest that non-Bt plants in the mixed plantings of non-Bt and Bt plants could provide an equivalent refuge population of SCB as structured refuge plantings

doi: 10.1603/ICE.2016.58888

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