Eficiência e efeitos subletais de nim sobre Bonagota salubricola (Meyrick) (Lepidoptera: Tortricidae)

Abstract

RESUMO -O objetivo deste trabalho foi avaliar a eficiência e os efeitos subletais de um inseticida à base de nim (10 g.L -1 de azadiractina A) sobre a lagarta-enroladeira Bonagota salubricola em laboratório. Nos bioensaios, foi utilizado o produto à base de azadiractina NeemAzal-T/S ® nas concentrações de 0,06%; 0,09%; 0,12%; 0,16%; 0,18% e 0,20% do produto comercial (p.c) e uma testemunha (água destilada). A dieta artificial foi cortada em cubos e imersa nas caldas das respectivas concentrações do produto, e, em seguida, lagartas recém-eclodidas foram transferidas para tubos de vidro, contendo os cubos de dieta tratados. Quando a dieta artificial foi tratada com concentração de 0,20% do produto comercial, houve 100% da mortalidade aos 6 dias após a inoculação. Por outro lado, as concentrações de 0,16 e 0,18% prolongaram a fase larval, reduziram a viabilidade de pupas e afetaram negativamente a fecundidade do inseto. Termos de indexação: Azadiractha indica, nim, lagarta-enroladeira. EFFICIENCY AND SUBLETHAL EFFECTS OF NEEM ON Bonagota salubricola (MEYRICK) (LEPIDOPTERA: TORTRICIDAE)ABSTRACT -The objective of this study was to evaluate the efficiency of control and sublethal effects of neem insecticide (10 g.L -1 of azadirachtin A) to the leafroller Bonagota salubricola at laboratory condition. In the bioassays, it was used an azadirachtin based product (NeemAzal-T/S ® ) at concentrations of 0.06%, 0.09%, 0.12%, 0.16%, 0.18% and 0.20% of the commercial product (c.p.) and a control (distilled water). The artificial diet was cut in cubes and immersed in the syrups of the respective product concentrations, soon afterwards recently-emerged caterpillars were transferred to glass tubes, containing the diet cubes treated. When the artificial diet was treated with a concentration of 0.20% of the commercial product, the mortality was 100% at the 6 th day after inoculation. Additionally, concentrations of 0.16% and 0.18% extended the larval stages, reduced pupae viability and negatively affected the fecundity of the insect.

The Sublethal Effects of Insecticides in Insects

“…The essential oils of Eucalyptus staigeriana F. Muell. azadirachtin A) presented different sublethal effects upon Bonagota salubricola (Meyrick) (Lepidoptera: Tortricidae), such as prolonged larval period, reduced pupal viability and fecundity [18]. In Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae), an increase in the pupal period was reported, when the moths were exposed to the neem oil by ingestion [19].…”

Effect of Sublethal Dose/Concentration on Various Insect Behaviors

“…Minyak esensial dari Eucalyptus staigeriana F. Muell, Ocimum gratissimum L. dan Foeniculum vulgare Mill menunjukkan beberapa pengaruh subletal pada biologi S. frugiperda, yaitu berkurangnya berat larva dan kepompong pada dosis subletal LD10, LD20 dan LD40 [16] . Minyak neem (10 g L -1 azadirachtin A) memberikan pengaruh subletal yang berbeda terhadap Bonagota salubricola (Meyrick), seperti periode larva yang berkepanjangan, berkurangnya viabilitas kepompong dan fertilitasnya [17] . Pada serangga Helicoverpa armigera (Hübner), dilaporkan terjadi peningkatan periode kepompong ketika ngengat terkena minyak Mimba dengan cara menelannya [18] .…”