Aqueous extract of Trichilia pallida and the development of Spodoptera frugiperda on corn genotypes

Abstract

The effect of aqueous extract of Trichilia pallida Swartz (Meliaceae) twigs was evaluated in relation to the development and survival of Spodoptera frugiperda (J. E. Smith) reared on two corn genotypes, the commercial standard C 901 and the resistant variety CMS 23. Newly hatched larvae of S. frugiperda were fed on the corn genotypes previously treated with the extract at concentrations of 0.1 and 1%. The following parameters were evaluated: weight, duration and viability of the larval and pupal stages. All larvae died when the 1% extract was used on both corn genotypes. At the concentration of 0.1%, the extract reduced the larval survival and weight, and prolonged the development period. Survival, weight and development period of the larvae were also affected by the genotype CMS 23.