Interaction of agricultural drainage water cations with insecticide potency

الملخص EN

The insecticides potency for controlling target insects in field may affected by many cations which present in water used in insecticides preparation in the field.

The toxicity of three types of insecticides lufenuron, lambda-cyhalothrin and tetramthrin and dimethoate.

The LC50 values for each compound against the 4th instar larvae of cotton leafworm Spodoptera littoralis (Boisduval) (Lepidoptera: Noctuidae) 72 hours was 0.001, 0.21 and 0.046 ppm.

Six different types of cobalt, sodium, potassium, calcium, magnesium and manganese all in a chloride salt to study their toxicity in presence and absence of LC50 of tested insecticides to examine their interaction and interference with insecticides toxicity.

Sodium and magnesium chloride had categorically decreased the toxicity of all tested insecticides at concentration 100, 0.01 ppm mortality decreased to 10, 40 and 36 % and 30, 30, 50 %, respectively.

Inhibition percentage of total ATPase and AChE were investigated.

Na+ counteracts effects of all tested insecticides with significant decrease in the levels of ATPase inhibition.

Conversely, Mg2+ decrease in the levels of AChE inhibition.

The toxicity and biochemical data had shown a very interrupted effect due to the presence of these cations due to their interference with the site of action of these pesticides.