The Effect of Some Insecticides on Parasitized and Non- Parasitized Spodoptera littoralis Larvae

Three insecticides, recommended by the Ministry of Agriculture, Egypt, for use against cotton and vegetable pests were tested . These insecticides were methomyl, methamidophos and chlorpyrifos. These insecticides were tested against the third instar of Spodoptera littoralis(Boisd.)larvae parasitized by Microplitis rufiventris (kok.) and non-parasitized S.littoralis larvae of the same age.In the first part which larvae fed oncastor oil leaves contaminated with insecticides.The insecticides can be arranged in the following descending order according to their LC50 's and statisticaly analysis. In larvae, chlorpyrifos,methomyl and methamidophos. In the second part which larvae fed on poisoned semi-artificial died. The tested insecticides can be arranged in the following descending order according to their LC50 's and statistical analysis. In both parasitized and non-parasitized larvae, methomyl, methamidophos, chlorpyrifos.

[1]  A. EL-Minshawy,et al.  Effect of parasitism on digestion and development of Spodoptera littoralis (Boisd.) larvae , 2009 .

[2]  D. Grzywacz,et al.  Application rate trials with a nuclear polyhedrosis virus to control Spodoptera littoralis (Boisd.) on cotton in Egypt , 1994 .

[3]  R. M. Sawicki Resistance to synthetic pyrethroids can be countered successfully. , 1986 .

[4]  M. E. Nassar,et al.  Rate of development of resistance and pattern of cross-resistance in fenvalerate and decamethrin resistant strains of S. littoralis. , 1986 .

[5]  M. El-guindy,et al.  Survey of resistance to organophosphorous insecticides in field strains of the cotton leafworm Spodoptera littoralis (Boisd.) during 1980 - 1984 cotton growing seasons. , 1984 .

[6]  M. abdel-sattar,et al.  Survey of resistance to pyrethroids in field strains of the cotton leafworm Spodoptera littoralis (Boisd.) during 1980 - 1984 cotton growing seasons. , 1984 .

[7]  A. Khalifa,et al.  Vertical and horizontal distribution of the Egyptian cotton leafworm eggmasses in cotton fields in Egypt. , 1982 .

[8]  A. EL-Minshawy,et al.  Suitability of Spodoptera littoralis larvae for development of Microplitis rufiventris , 1977, The Journal of Agricultural Science.

[9]  M. Kamal Biological control projects in Egypt, with a list of introduced parasites and predators. , 1951 .

[10]  F. Wilcoxon,et al.  A simplified method of evaluating dose-effect experiments. , 1948, The Journal of pharmacology and experimental therapeutics.