Efficacy of some insecticides on certain small powder post beetles (Family: Bostrychidae) infesting mango trees.
Batt A. E. M.
Author Affiliation: Plant Protection Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt.
Egyptian Journal of Agricultural Research 78 : 1525-1540
Abstract : The toxicity of four insecticides, diazinon (Basudin 60EC), phenthoate (Cidial L50EC), fenvalerate (Sumicidin 60EC) and fenitrothion (Sumithion 50EC), all applied at 1.5, 3 and 6 ml/litre, against the bostrychid borers, Dinoderus minutus, Enneadesmus obtusedentatus and Sinoxylon sudanicum, infesting mango trees, was studied under laboratory conditions. Toxicity of the insecticides, based on toxicity index (TI) obtained from LC50 and LC90 values, varied according to the tested borers. Diazinon was the most effective insecticide against D. minutus. Based on LC50 and LC90 values, fenitrothion and phenthoate were the most effective against E. obtusedentatus, while diazinon and phenthoate were most effective against S. sudanicum. The percentages of infestation reduction showed highly significant differences between insecticides. Diazinon at 3600 and 1800 ppm, phenthoate at 3000 ppm and fenvalerate at 3600 ppm resulted in 62-75% reduction of D. minutus and 63.5-77.8% reduction of S. sudanicum, while diazinon, phenthoate and fenvalerate at 6300 ppm resulted in 67.3-81.6% reduction of E. obtusedentatus.