Efeito de extrato aquoso de Melia azedarach no desenvolvimento das fases imatura e reprodutiva de Spodoptera frugiperda (J. E. Smith, 1797) (Lepidoptera: Noctuidae)

Abstract

The effect of different concentrations of aqueous extracts of Melia azedarach on Spodoptera frugiperda biology was investigated under laboratory conditions. Corn leaves were immersed in solutions with extract concentrations of 0.1%; 1.0% and 5.0% and offered to newly-born larvae. At higher doses (1.0% and 5.0%) the extracts caused 100 % mortality of larvae. Observations of dead larvae showed abnormal moults and death at ecdysis. At the concentration of 0.1%, chinaberry extract increased the larval phase and reduced significantly the larval and pupal weight. Reproduction parameters, as the number of eggs per female, eggs per oviposition and eggs viability were affected using emerged adults from treated larvae with concentration of 0.1% Melia extract. The fecundity was drastically reduced. Survival and duration of egg stage were not affected by the extracts. No effect was observed in relation to attractiveness of caterpillars at first instar in tests with possibility of choice. The chinaberry aqueous extract showed good potential to be used as a control agent for S. frugiperda.

Aqueous Extracts of Species of the Genus Campomanesia (Myrtaceae) Affect Biological Characteristics of Plutella xylostella (Linnaeus, 1758) (Lepidoptera: Plutellidae)

“…Another interesting feature is that the C. xanthocarpa extract increased larval duration, consequently increasing pupal biomass, whereas the C. adamantium extract decreased larval duration and pupal biomass. Therefore, pupal weight is directly related to the insect performance in the larval stage (Maroneze & Gallegos, 2009).…”

“…This decrease may be related to the quantity and quality of nutrients absorbed during the larval stage, since these parameters may influence the number of ovarioles per ovary and consequently decrease egg production (Costa et al, 2004). This is very important in the field, because this decreased egg survival will decrease the number of individuals in the next generation, and fewer caterpillars will cause less damage to crops (Maroneze & Gallegos, 2009). According to Peres et al (2017), the aqueous extract of Alibertia sessilis increased larval duration, which resulted in larval mortality or late pupal mortality.…”

Histological and Histochemical Changes by Clove Essential Oil Upon the Gonads of Spodoptera frugiperda (JE Smith) (Lepidoptera: Noctuidae)

“…The search for new control methods includes the use of secondary plant metabolites, as several substances derived from plants have shown efficacy in pest control, exertingdifferent biological effects, such as repellency, feeding and growth inhibition, changes in the hormonal system, morphogenetic changes, disturbances in sexual behavior, sterilization, mortality in immature or adult stage, reduced fecundity and fertility, among others (Isman, 2006;Gallegos & & Maroneze, 2009).…”