Biological parameters of Spodoptera cosmioides Walker (Lepidoptera: Noctuidae) in cotton varieties

Abstract

Spodoptera cosmioides Walker is a polyphagous insecticide-resistant species found in various regions of Brazil. Despite occurring at low densities, it is considered a potential pest of cotton, soybean, and bean crops in the Brazilian cerrado. This work investigated the comparative biology of S. cosmioides in the commercial transgenic cotton NuOPAL (Bollgard I, Evento 531) and the conventional isoline variety DeltaOPAL. The experiment was conducted under laboratory conditions (26 ± 1°C; relative humidity: 70 ± 10%; photoperiod: 12h), using newly-hatched and individualized larvae. We evaluated the duration and viability of immature stages, duration of the biological cycle, pupal weight, sex ratio, percentage of deformed adults and of adults trapped in the pupal case, adult longevity, fecundity, and egg viability. The biological parameters observed showed no significant differences between the two varieties studied, which enabled high consumption, high assimilation, high fecundity, and viability for S. cosmioides.

Survival and development of Spodoptera eridania, Spodoptera cosmioides and Spodoptera albula (Lepidoptera: Noctuidae) on genetically‐modified soybean expressing Cry1Ac and Cry1F proteins

“…Similar results were observed for S. eridania fed on Cry1Ac/Cry1F‐cotton 30 . Previous studies also reported that S. eridania and S. cosmioides had naturally low susceptibility to Cry1Ac and Cry1F proteins in diet bioassays 13,31–34 and to Cry1Ac‐soybean 13,35 and Cry1Ac‐cotton 36,37 . Consistent with these findings, other species from the Spodoptera genus including S. frugiperda , S. exigua (Hübner) and S. litura (F.) exhibited low susceptibility to Cry1Ac‐soybean, 13,37 Cry1Ac‐cotton 24,25,38,39 and Cry1Ac/Cry1F‐cotton 24,26 .…”

Voltammetric Determination of Total Phenolic Compounds in Cotton Leaves of Gossypium barbadense and Gossypium hirsutum Challenged with Spodoptera cosmioides (Walker)

“…42 It is an important cotton pest, and biotechnology for its control has been developed: the use of Cry toxins of Bacillus thuringiensis (Bt) (Berliner, 1915) in transgenic or biological control. 8 For the infested G. hirsutum plants, otherwise, both younger and older leaves presented equivalent total phenolic levels, as the young non-infested leaf. Therefore, the physiological response to the loss of leaf area fed by S. cosmioides caused a reduction in the Table II.…”

“…7 Spodoptera cosmioides (Walker) (Lepidoptera, Noctuidae) caterpillars are polyphagous, causing damage to cotton, soybean maize, and other crops. 8 Plant secondary metabolites comprise more than 100.000 substances that may have applications such as pharmaceuticals, insecticides, dyes, flavors, and fragrances. 9 Secondary metabolites may be induced by pests that become more tolerant to new infestations.…”