Source of antibiosis to Spodoptera frugiperda (Lepidoptera: Noctuidae) in mocó cotton genotypes (Gossypium hirsutum raça marie galante L. Hutch)

Abstract

Spodoptera frugiperda (Lepidoptera: Noctuidae) cause damage in cotton plants since the plant emergence until maturation. The objective of this work was to evaluate antibiosis in mocó cotton genotypes (Gossypium hirsutum var marie galante L. Hutch) to S. frugiperda. Newly hatched larvae were individualized in plastic containers (100 mL) sealed with polyethylene film to prevent the insect scape, where they were fed with cotton leaves. The treatments were 27 cotton genotypes, with 40 replications for antibiosis and 20 for nutritional parameters, using a completely randomized design. The biological parameters evaluated were: larval period and viability, weight of caterpillars at ten days, pre-pupal period and viability and pupal weight at 24 hours, life cycle and total viability, adult longevity and sex ratio. Additionally, cotton genotypes were characterized by four microsatellite markers linked blue disease resistance, angular leaf spot, root-knot nematode and reniform nematode. There was high initial mortality of S. frugiperda larvae in genotypes BA0512, MA0423, PI0438, PI0432, CE0461, CE0507, RN0512, MA0425, MA0438, PI0429, MA0430, PI0440, PI0467, AC0602, PI0416, BA0477, MA0409 and MA0409 CE0467. The cotton genotypes presented antibiosis and SSR resistance markers for nematode and blue disease, highlighting that the germplasm of this species is an important source of multiple resistance for insect resistant genotype selection programs