Khidr,, A., Mohamed, H., Ahmed, M. (2006). EVALUATING THE TOXIC AND LATENT EFFICACY OF SPINOSAD AGAINST THE COTTON LEAFWORM, Spodoptera Iittoralis (BOISD.). Journal of Plant Protection and Pathology, 31(10), 6725-6733. doi: 10.21608/jppp.2006.235328
A. A. Khidr,; H. A. Mohamed; M. A. Ahmed. "EVALUATING THE TOXIC AND LATENT EFFICACY OF SPINOSAD AGAINST THE COTTON LEAFWORM, Spodoptera Iittoralis (BOISD.)". Journal of Plant Protection and Pathology, 31, 10, 2006, 6725-6733. doi: 10.21608/jppp.2006.235328
Khidr,, A., Mohamed, H., Ahmed, M. (2006). 'EVALUATING THE TOXIC AND LATENT EFFICACY OF SPINOSAD AGAINST THE COTTON LEAFWORM, Spodoptera Iittoralis (BOISD.)', Journal of Plant Protection and Pathology, 31(10), pp. 6725-6733. doi: 10.21608/jppp.2006.235328
Khidr,, A., Mohamed, H., Ahmed, M. EVALUATING THE TOXIC AND LATENT EFFICACY OF SPINOSAD AGAINST THE COTTON LEAFWORM, Spodoptera Iittoralis (BOISD.). Journal of Plant Protection and Pathology, 2006; 31(10): 6725-6733. doi: 10.21608/jppp.2006.235328
EVALUATING THE TOXIC AND LATENT EFFICACY OF SPINOSAD AGAINST THE COTTON LEAFWORM, Spodoptera Iittoralis (BOISD.)
Plant Protection Research Institute. Agricultural Research Center. Dokki. Giza. Egypt
Abstract
Spinosad is an insect control agent. Spinosad is derived from the metabolites
of the naturally occurring bacteria, Saccharopolyspora spinosa. The objective of this
study is to evaluate the toxicity as well as the latent efficacy of spinosad against the
4'11 instar larvae of the cotton leafworm. Spodopfera ifitoralfs (Boisd) Different
bioassays namely; dipping, contact to a surface film and immersion techniques were
used in this investigation. The biocide was bioassayed after 24, 48, 72 and 96 hours.
The highest toxicity of spinosad was noticed after 96 hours. Results illustrated the
superiority of dipping technique for the 4''1 instar larvae to the biocidal action of
spinosad. The efficiency of the bioassay techniques reflecting the larval susceptibility
could be descendingly arranged as follows: dipping. immersion and contact to a
surface film. The corresponding Lcso and LCgo values against the tested larvae after
96 hours were 122.85 8. 518.61; 129.90 8. 606.78 and 141.34 8. 978.38 ppm.
respectively. The 4'11 instar larvae of S. iiioraiis showed moderately susceptibility to
the biocidal action of spinosad as demonstrated by the toxicity ratios. The toxicity
ratios of all bioassay techniques were less than 1.00. The susceptibility index as well
as the potency level expressed as numbers of folds at both L050 and Lean values
increased with increasing the period of determination. The latent effects of spinosad
on the pupation as well as the adult emergence were determined. The corresponding
ECso and ECgo values associated to quintals scoring of pupation due to dipping,
immersion and contact to a surface film of bioassays were 36.248. 251.95; 50.02 8
549.34 and 63.57 8. 711.97 ppm. respectively. Whereas the corresponding ICso and
lovalues associated to inhibition of the adult mergence were 7.28 8. 215.44; 43.52
8. 291.42 and 54.12 8. 386.07 ppm, respectively.
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