ABSTRACT
Laboratory and field experiments was conducted to evaluate the toxicity of two biocides i.e. onion oil and
byrovect (mixture of Bacillus thuingiensis var kurestaki and Spodotera littorales NPV) against Pectinophora
gossypiella (PBW) and Earias insulana (SBW). The LC
50
& confidence limits (95%) for values of onion oil and
byrovect after 2 hours, 2 days and 7 days of treatment were determined. Moreover, the biological effects of LC
50
of
the onion oil against pre-adult and adult stages of PBW were studied. Also, the two biocides and Chlorofet EC
(48%) (As a chemical insecticide) were evaluated in Qalyoubia Governorate cotton field, individually (each one
alone in sequence of 4 applications) as well as the three compounds in 2 different sequences program against cotton
bollworm complexes, SBWand/or PBW. Present results cleared that the sequencing spray of onion oil (1
spray),
chlorofet EC (48%) (2
nd
spray) and byrovect (3
rd
spray) was the most effective program against the PBW cotton
boll infestation and larval content. In this respect chlorofet EC (48%) individually revealed high potential efficacy
against SBW and boll complexes.
st