LEUCOKININ II A NEUROPEPTIDE HORMONE AFFECTING BIOLOGICAL AND BIOCHEMICAL ACTIVITIES OF THE EGYPTIAN COTTON LEAFWORM Spodoptera littoralis (BOlSD.) | ||||
Journal of Plant Protection and Pathology | ||||
Article 4, Volume 31, Issue 8, August 2006, Page 5445-5452 PDF (102.08 K) | ||||
Document Type: Original Article | ||||
DOI: 10.21608/jppp.2006.235239 | ||||
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Authors | ||||
M. S. Salem,1; A. S. El-Maasarawy1; Sondos A. Mohamed2; Samah Abd El-Khalek | ||||
1Economic Entomology Department, Fac.Agric.,Cairo Univ.,Giza, Egypt | ||||
2Plant Protection Research institute, ARC, Dokki. Giza, Egypt | ||||
Abstract | ||||
The insect neuropeptide, leucokinin it was injected into larvae of the cotton leafworm Spodoptera littoraiis(Boisd.) to investigate the influence on development, digestive enzyme release and heamolymph main component. One injected dose of (2x166 to 4x10'aM) of leucokinin ll into the 5"" instar larvae induced prolongation in pupal period in all experimental groups, while it had no effect on the timing of larval ecdysis and length of feeding period. Also leucokinin ll caused a great reduction in pupal weight, adult longevity, oviposition period, fecundity and fertility. A significant increase in larval mortality 66.66 to 86.66% was observed. Leucokinin ll inhibited the release of digestive. protease, amylase, trehalase and invertase. A significant reduction was obtained in total protein level, whereas total carbohydrate and total lipid levels were significantly increased in dose dependent manner. | ||||
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