Resistência de híbridos de milho convencionais e isogênicos transgênicos a Spodoptera frugiperda (Lepidoptera: Noctuidae)

Abstract

This study evaluated the effect of damage caused by S. frugiperda on yield of maize hybrids and their conventional and isogenic transgenic versions, with different Bt toxins, in field conditions. Experiments were conducted in the municipalities of Campinas and Mococa, São Paulo State, Brazil, in the growing seasons of 2010/2011 and 2011/2012, in a randomized complete block design, with 12 treatments and four replications. The variables evaluated were: grain productivity, one hundred grain weight and grain yield. For the assessment of damage caused by S. frugiperda was verified the intensity of leaf injuries through visual scale of notes, with variation of 0 and 9, from 15 to 60 days after sowing. Lower scores of damage caused by S. frugiperda were found in transgenic hybrids. Most conventional hybrids do not differ in grain productivity from at least one of isogenic transgenic versions. The same maize hybrid with different Bt toxins may have different productive behavior in field conditions. Different Bt toxins respond differently to damage caused by S. frugiperda.

Interaction between Corn Genotypes with Bt Protein and Management Strategies for Spodoptera frugiperda (Lepidoptera: Noctuidae)

“…The major damage in the transgenic hybrid P 3862 HX and in the conventional BM 3061 confirms that plants without or with only 1 protein (Yieldgard®, Monsanto, São Paulo, Brazil; Total Liberty®, Bayer, São Paulo, Brazil; and Herculex®, Du Pont/Dow AgroScience, São Paulo, Brazil) are more vulnerable to S. frugiperda, whereas genotypes with more than 1 protein, such as Impact VIP 3, are less vulnerable (Michelotto et al 2013;Moraes et al 2015). Reduction of S. frugiperda damage with the interaction of integrated pest management and Impact VIP 3 demonstrates that genotypes with a single protein, such as P 3862 HX (Cry1F), should not be used as an isolated strategy in S. frugiperda integrated pest management, and that combinations of these are the best alternative for pest management in agricultural crops (Bueno et al 2011;Ramalho et al 2011).…”

“…Palavras Chave: lagarta-do-cartucho; parasitoides; Resistência de plantas a insetos; Zea mays Corn (Zea mays L.; Poaceae) is one of the most important agricultural crops in the world, but pests can compromise the yield and quality of this plant (Teixeira et al 2014;Moraes et al 2015). Lepidoptera larvae are among the most significant corn pests in Brazil, especially Diatraea saccharalis Fabricius sensu Guenée (Lepidoptera: Crambidae), Elasmopalpus lignosellus (Zeller) (Lepidoptera: Pyralidae), Helicoverpa zea Boddie (Lepidoptera: Noctuidae), Mocis latipes (Guenée) (Lepidoptera: Erebidae), and Spodoptera frugiperda (JE Smith) (Lepidoptera: Noctuidae) (Pereira et al 2000;Girón-Pérez et al 2014;Paiva et al 2016).…”

Induction of resistance to fall armyworm (Spodoptera frugiperda) (Lepidoptera: Noctuidae) in transgenic and conventional corn plants

“…These results are attributable to the presence of genes of B. thuringiensis bacteria with insecticidal activity against S. frugiperda (Moraes et al, 2015).…”

Influência De Danos Foliares De Lagarta-Do-Cartucho Em Híbridos De Milho Transgênicos E Convencionais

“…A resistência do tipo não-preferência ocorre quando a planta é menos utilizada pelo inseto, para alimentação, oviposição, ou abrigo, do que outra planta em igualdade de condições, podendo ser de natureza física, química e/ou morfológica (BOIÇA JUNIOR et al, 2013;MORAES, 2015).…”