INHIBITION OF GROWTH AND DEVELOPMENT OF COTTON LEAFWORM (LEPIDOPTERA : NOCTUIDAE) LARVAE BY -CARBOLINE ALKALOIDS | ||||
| Journal of Plant Protection and Pathology | ||||
| Article 6, Volume 30, Issue 1, January 2005, Page 671-679 PDF (509.71 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jppp.2005.238607 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| H. A. Eldoksch; M. G. Elsherief | ||||
| Central Pesticide Laboratory, Agricultural Research Center, Ministry of Agriculture, Doki, Giza, Egypt | ||||
| Abstract | ||||
| The feeding deterrence and growth retardant effect of petroleum ether extract and total b-carboline alkalods isolated from Peganum harmala L. seeds were assessed against the cotton leafworm S. littoralis larvae. Thin layer chromatography was used for separation of the compounds in the alkaloids mixture with Rf values of 0.24, 0.38, 0.60 and 0.68. Using the leaf disc technique, the total b-carboline alkaloids showed the highest feeding deterrence to the larvae (1000 ppm concentration caused 100% deterrence) followed in a descending order by petroleum ether extract. Acetone and methanol extracts exhibited slight antifeeding activity to the larvae. The larval average weight was relatively low by feeding on the alkaloid mixture-treated diet. Only 51.7% of the larvae pupated at the concentration of 0.2% (2000 mg/g diet). The petroleum ether extract also revealed antifeeding and growth retardant activity. A negative correlation between the concentration of total alkaloids in the diet and feeding response was found represented by larval growth and pupation. The results showed that the pre-pupal stage was highly affected by the petroleum ether extract and b-carboline alkaloid mixture. | ||||
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