Desempenho de larvas de Helicoverpa armigera(Hübner) (Lepidoptera: Noctuidae) em diferentes fontes alimentares

Abstract

RESUMO Recentemente observada no Brasil, Helicoverpa armigera tornou-se praga relevante, tanto pela rápida disseminação como pela importância econômica das culturas nas quais se estabeleceu, como a soja e o milho. A compreensão do processo de estabelecimento em diferentes regiões e sistemas de produção e da dinâmica populacional de uma praga reconhecidamente polífaga, como base para o seu manejo, depende do conhecimento sobre o efeito de espécies vegetais como alimento, na biologia da espécie. Conduziu-se experimento em laboratório, fornecendose às lagartas órgãos reprodutivos de soja, milho, canola, aveia-preta, aveia-branca, nabo e azevém. Concluiu-se que as diferentes fontes alimentares afetam o desenvolvimento larval de H.armigera. Espigas de milho e de trigo e síliquas de canola são os melhores alimentos para o desenvolvimento de H.armigera. Espigas de azevém, por outro lado, são o pior alimento. Panículas de aveia-preta e aveia-branca e síliquas de nabo são menos adequadas que vagens de soja, como fonte de alimento para as lagartas.

Biology and fertility life table of Helicoverpa armigera (Lepidoptera: Noctuidae) in different hosts

“…Suzana et al . () reported that pupal survival with soybean and artificial diet were 56% and 72%, respectively, which are values similar to those obtained in this research. Kunjun et al .…”

“…Suzana et al . () revealed that the larvae of H. armigera fed only on corn leaves did not complete this stage of growth, whereas those fed on the reproductive parts of wheat showed a survival of 64%, which was similar to the values shown in this research. Amer and El‐Sayed () observed that larva mortality for corn was 48.33%, which was also similar to the value shown in this research.…”

“…Host plants influence the survival, the intensity of consumption of the larvae (Suzana et al . ) and the fecundity and longevity of adults (Ruan & Wu ; Kulkarni et al . ).…”

“…Caterpillars of this species grow at different phenological stages on several families of plants, though they prefer feeding on the reproductive structures of their hosts, such as flower buds, fruits, spikes, panicles and other inflorescences (Wackers et al 2007). Host plants influence the survival, the intensity of consumption of the larvae (Suzana et al 2015) and the fecundity and longevity of adults (Ruan & Wu 2001;Kulkarni et al 2004). Although caterpillars of many species of Lepidoptera have acquired a large capacity of digestion over time, the mechanisms of antibiosis present in plants can directly affect the survival, the size or the weight of the insects (Bernays 1998;Sarfraz et al 2006).…”

Efficacy evaluation of spinosad bioinsecticide capsules suspension for the control of Helicoverpa armigera

“…) in very extensive management contiguous areas with non-judiciars use of high toxicity pathology category agrochemicals has contributed to resistance development in H. armigera, which resultand in heavy crop losses each year (Vijayabharathi et al, 2014;Specht et al, 2013;Suzana et al, 2015).…”