Impacts of Nosema sp. (Microsporidia: Nosematidae) on the sugarcane borer, Diatraea saccharalis (Lepidoptera: Crambidae).

摘要: Abstract In Brazil, the sugarcane borer, Diatraea saccharalis (Fabricius, 1794) (Lepidoptera: Crambidae), is controlled with massive releases of hymenopteran parasitoid Cotesia flavipes Cam. (Hymenoptera: Braconidae); over 3 million hectares are treated annually 18 billion parasitoids. order to meet this demand, parasitoids produced in D. under laboratory conditions where a Nosema sp. reported be an important problem mass rearing host. The goals for work were study pathogenicity and progression disease host conditions. average median lethal time (LT 50 ) first instar varied from 9 ± 0.3 42 ± 2.3 days at concentration 5 × 10 5 –0.5 spores/mm artificial diet (10 7 –10 spores/μl). For third instar, LT ranged 32 ± 0.7 37 ± 0.7 days –5 × 10 2 4 spores/μl saline). necessary cause 50% mortality (LC larvae was 5.6 (0.9–17.6) estimated LC 1,200 (200–4700) spores/μl. impacts on analyzed fed 0.5 diet. Duration viability larval pupal stages, adult longevity, weight fertility life table measured offspring mating pairs composed infected females uninfected males or compared pairs. infection resulted adverse effects all biological parameters except duration stages male pupae, which did not differ statistically between groups. intrinsic rates growth ( r m greater either female infected. rate individual by adults 48.2% faster than it negative (−0.003) when Our confirms impact production but shows potential use as microbial control agent borer.