Laboratory and Field Evaluations of Two Biocides and an Insecticide Against Pectinophora gossypiella (Saund.) (Lepidoptera: Gelechiidae) and Earias insulana (Boisd.) (Lepidoptera: Noctuidae)

摘要

Laboratory and field experiments was conducted to evaluate the toxicity of two biocides i.e. onion oil andbyrovect (mixture of Bacillus thuingiensis var kurestaki and Spodotera littorales NPV) against Pectinophoragossypiella (PBW) and Earias insulana (SBW). The LC50& confidence limits (95%) for values of onion oil andbyrovect after 2 hours, 2 days and 7 days of treatment were determined. Moreover, the biological effects of LC50of the onion oil against pre-adult and adult stages of PBW were studied. Also, the two biocides and ChlorofetEC (48%) (As a chemical insecticide) were evaluated in Qalyoubia Governorate cotton field, individually (eachone alone in sequence of 4 applications) as well as the three compounds in 2 different sequences programagainst cotton bollworm complexes, SBWand/or PBW. Present results cleared that the sequencing spray ofonion oil (1st spray), chlorofet EC (48%) (2nd spray) and byrovect (3rd spray) was the most effective programagainst the PBW cotton boll infestation and larval content. In this respect chlorofet EC (48%) individuallyrevealed high potential efficacy against SBW and boll complexes.