Laboratory and field efficacy of some natural and chemical formulation on Aphis crassivora, koch, homoptera: aphidiae, and its natural enemies
2009
Ragab, M.E. | Abdel-Baky, N.F. | Abd-Rabou, S. | Elashram, D.F.
The cowpea aphid, Aphis crassivora (Koch) (Homoptera : Aphididae) one of the most important pests in Egypt. This work dealt with the laboratory and field tests of the effect of Biofly, Neemex and Sumithion compounds on the cowpea aphid and its parasitoids and predators. The laboratory tests indicated that the potency of Biofly, Neemex and Sumithion was varied tremendously due to compounds and also, data proved that at any of the compounds the higher the concentration, the higher was the rate of mortality and vice versa. The obtained results indicated that, when A. crassivora, the parasitoid Aphidus ervi Haliday (Hymenoptera:Aphididea), the predator, Chrysoperla camea (Steph.) (Neuroptera: Chrysopidae) and Coccinella undecimpunctata L. (Coleoptera : Coccinellidae) were treated with Biofly, Neemex and Sumithion, the mortality percentages ranged from 6l.4-92.5, 59.7-89.7, and 89.5 100%.; 62.8-93.6, 61.2-91.9 and 91.8-100%; 61.5-91.3 ,59.6-88.6 and 89.7-100% and 59.8-92.7, 58.2-80.5 and 87.1-100%, respectively. In the filed tests the results observed, the two compounds Biofly and Neemex gave moderate effect against adults , nymphs of A. crassivora, C. undecimpunctata, C. camea and A.ervi with percent reduction 68.1 and 74.3% and 64.43 and 71.87% ; 68.2 and 78.66% and 68.70 and 75.8% :59.1 and 56.1% and 60.3 and 58.2%; 57.2 and 63.8% and 58.3 and 68.4% and 63.60 8 65.1% and 60.3R and 58.2%; 57.2 and 63.8% and 58.3 and 68.4% and 63.60 and 65.1% and 66.8 and 60.4% after 15 days. in the first and second years,respectively. on the other hand, Sumithion gave high efficacy against all targets, adult, nymphs of A. craccivora, C. undecimpunctata , C. camea and A.ervi with percent reduction 97.5 and 97.3; 96.8 and 96.6%; 94.6 and95.8 ; 96.7% and 95.6% and 97.6% and 98.7% after 15 days from application in the first and second years, respectively.
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