Abstract
The present work aimed to studying the effect of ethanol extract of Ricinus commnuis L. seeds on biological and physiological for cotton leafworm Spodoptera littoralis 2nd and 4th instar larvae. The results cleared that the larval duration were 17.08 &15.58 days and 10.11 & 9.36 days for treated and untreated of the 2nd & 4th instar larvae, respectively. The pupation percent was 60.0 and 96.0 % for treated and untreated of the 2nd instar larvae and 61.0 and 93.0 for treated and untreated of the 4th instar larvae. The pupal weight was affected by the botanical extract. The pupal duration was 11.40 and 11.71 days for treated and untreated of the 2nd instar larvae and it was 11.96 and 12.51 days for treated and untreated of the 4th instar larvae. The emergence % was 82.0 compare to 97.0 % and 86.0 compare to 98.0 % for the 2nd & 4th instar larvae, respectively. On the other hand, the malformed adult was 28.0 and 2.0 % for the 2nd instar larvae (treated and untreated) and 16.0 & 5.0 % for 4th instar larvae (treated and untreated), respectively. There are decreasing in fecundity for treatment by botanical extract to S. littoralis 2nd and 4th instar larvae. Effect of LC50 value of the tested plant extract on the biochemical aspects of the 4th larval instar of S. littoralis was detected. The biochemical aspects AST, ALT, alkaline and acid phosphatase and total protein activities post treatment were considered throughout the present study.
Highlights
The Egyptian cotton, Gossypium barbadense L., is one of the most economic agricultural cash and industrial crops
The stock culture of susceptible S. littoralis was reared on castor oil leaves Ricinus communis L. for several generations at laboratory conditions of
The efficiency of some solvent extracts for R. communis were evaluated against S. littoralis 2nd and 4th larval instar, which were hexane, acetone, ethanol and water extract are tabulated in Tables (1&2) and graphically illustrated as toxicity lines in Figs. (1&2)
Summary
The Egyptian cotton, Gossypium barbadense L., is one of the most economic agricultural cash and industrial crops. Data concerning the effect of LC50 value of the ethanol extract of tested plant, R. communis on the biological aspects of the 2nd and 4th larval instar of S. littoralis.
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