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Abundance of Non-Target Predators in Genetically Modified Corn

Hernández-Juárez, Agustín, Aguirre, Luis A., Cerna, Ernesto, Flores, Mariano, Frías, Gustavo A., Landeros, Jerónimo, Ochoa, Yisa M.
TheFlorida entomologist 2019 v.102 no.1 pp. 96-100
Bacillus thuringiensis, Chrysoperla carnea, Coleomegilla maculata, Orius insidiosus, Zea mays, corn, hybrids, isogenic lines, nontarget organisms, pesticide application, planting, pollination, population dynamics, predators, risk, statistical analysis, toxins, transgenic plants, Mexico
Genetically modified corn (maize) Zea mays (Poaceae) expressing Bacillus thuringiensis (Bt) Berliner (Bacillaceae) toxins is a controversial issue due to the risk they could pose to predators as non-target organisms. Thus it is important to evaluate that risk before Bt corn is released for commercial planting in Mexico. The effect of genetically modified corn hybrid Agrisure® Vipteraᵀᴹ 3111 on the abundance of non-target predators Orius insidiosus Say (Hemiptera: Anthocoridae), Coleomegilla maculata (De Geer) (Coleoptera: Coccinellidae), and Chrysoperla carnea (Stephens) (Neuroptera: Chrysopidae) was evaluated at Oso Viejo and El Camalote in Culiacan, Sinaloa, and compared with its non-genetically modified isoline with and without insecticide treatment in a randomized complete block design with 3 treatments and 4 replicates. Complete plant visual samplings were performed to determine predator abundance, frequency, and population fluctuation using the Kruskal-Wallis non-parametric statistical test. A total of 5,228 predators were collected in all hybrids in both localities: 2,431 at Oso Viejo and 2,797 at El Camalote with 2 peaks before and after pollination. In both locations, each predator population had a similar fluctuation in all hybrids. Although no statistical difference was found among treatments, in all cases, Agrisure® Vipteraᵀᴹ 3111 had higher abundance than the isolines with and without insecticide treatment. Results show that Agrisure® Vipteraᵀᴹ 3111 does not have a negative effect on predator abundance of O. insidiosus, C. maculata, and C. carnea.