Selective field toxicity of four insecticides on wheat aphid, Schizoaphis graminum and its three coccinellid predators.

Document Type : Original Article

Authors

1 Department of Economic Entomology, Faculty of Agriculture, Alexandria University, Alexandria, Egypt

2 Department of Pesticide Chemistry Faculty of Agriculture, Alexandria University, Alexandria, Egypt

10.21608/jpces.2000.460488

Abstract

Selective toxicity of dimethoate 40% E_C. at the rates of 0.4 and 0.8 L/ha, malathion 57% E.C. at the rate of 1.0 and 1.5 L/ha, pirimiphos-methyl 50% E.C (2.0 L/ha), and pirimicarb 50%W.P. (0.3 kg/ha) in controlling wheat aphids and their adverse effects on the coccinellid predators was carried out. The results showed that pirimiphos-methyl was the most toxic insecticide to wheat aphid, Schizoaphis graminum, while, malathion (1L/ha) was the least one. Pirimiphos-methyl treated plants produced significantly high levels of wheat grains followed by dimethoate  (0.8 L/ha), pirimicarb (0.3 kg ma), dimethoate (0.4 L / ha), and malathion (1.0 and 1.5 L / ha) The data indicated that malathion (1.5L/ha) and dimethoate (0.8 L/ha) had significantly affected the food consumption of aphids by the laidy predator becthes, however, pirirniphos-methyl showed low effects in this respect. Malathion (I .5 L /ha) was the most nonselective insecticide to the three types of the beneficial coccinellid beetles where it caused 100 % mortality. However, pirimiphos-methyl was relatively more selective. Generally, it can be concluded that pirimiphos-methyl was efficient in controlling the wheat aphid but relatively safe for its natural enemies coccinellid predators under field conditions

Keywords

Journal of Pest Control and Environmental Sciences
Volume 8, Issue 1
April 2000
Pages 85-96

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