Utilização de nematoides entomopatogênicos (Nematoda: Rhabditida) e Inseticidas botânicos visando ao controle de adultos de Rhynchophorus palmarum L. 1764 (Coleoptera: Curculionidae)

Abstract

Although promising, there are few studies that use nematodes and botanical insecticides for the control of Rhynchophorus palmarum. Thus, this study evaluated the potential of natural pesticides and some isolates of Steinernema and Heterorhabditis, as well as compatibility with neem oil and efficiency of the mix to control the palm weevil. All EPNs isolates were pathogenic to this pest, mainly the heterorhabtids strains. The nematode Heterorhabditis sp. AL43 caused the higher mortality rate in adults of R. palmarum. Only the insecticide based on neem oil was efficient, specifically in the concentration of 5% it was greater than 90% adult mortality of R. palmarum. Entomopathogenic nematodes of the genus Heterorhabditis were compatible with neem oil at all concentrations tested. The strain Steinernema glaseri RS38 was compatible with neem oil 1%, despite have shown sensitivity when exposed to concentrations 2, 3 and 4%. The mix (4% neem + 500 IJs / mL) provoked 70% of insect mortality by, then the mixture (3% neem +1000 IJs / mL) caused 60% of insect mortality. Thus, the use of entomopathogenic nematodes and neem oil in mixture could be a potential strategy to be used in the integrated control of this pest.