EVALUATION THE EFFICIENCY OF SOME INSECTICIDES IN CONTROLLING COTTON LEAF-WORM Spodoptera littoralis (BOISD) (LEPIDOPTERA: NOCTUIDAE) ON POTATO (Solanum tubersum L.) AND SURVEY        THE NATURAL ENEMIES OF THE INSECT

F. Al-Jassany, R.; K. J. Rabee, S.; H. Samir, S.

	EVALUATION THE EFFICIENCY OF SOME INSECTICIDES IN CONTROLLING COTTON LEAF-WORM Spodoptera littoralis (BOISD) (LEPIDOPTERA: NOCTUIDAE) ON POTATO (Solanum tubersum L.) AND SURVEY THE NATURAL ENEMIES OF THE INSECT
IRAQ JOURNAL OF AGRICULTURE
Article 1, Volume 14, Issue 3, 2009, Pages 0-0
Authors
R. F. Al-Jassany; S. K. J. Rabee; S. H. Samir
Abstract
This study was carried out in fields of College of Agriculture, Abu-Gharib during autumn season 2000 to evaluate the activity of some insecticides in controlling cotton leaf-worm on potato crop (deseri variety). Results showed that the insecticides Fastak, Carbaryl and Presor were very effective in reducing the population density of larvae after 1, 3 and 7 days after application but the efficiency was reduced after 14 days. Although the chitin inhibitor Match was low activity in reducing larvae population after 1 and 3 days, Match showed higher activity after 7 and 14 days. The mixture of Presor and Match gave good results after two weeks of treatment, however the mixture of presor and Fastac achieved the best control of larvae compared when used each one alone. Regarding natural enemies results indicated presence of two species of porasitoides Exorista sp. (Diptera: Tachanidae) and another unidentified species belongs to Ichenumonidae and presence of two predators the wasp Ammophilla sp. (Hymenoptera: Sphicidae) and unidentified species of ant. Also the virus NPV was recorded on larvae of th e insect. According to the results of this study it can be recommended for controlling cotton leaf-worm to apply the insecticides at the first stages of plant and depend on natural enemies at late stages of plant.

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