Evaluating toxicity of extracted nano -Destruxin against the desert locust Schistocerca gregaria in Egypt

Abstract

Nano destruxin tested under laboratory and semifield condition. Results show that the LC50s of the locust S. gregaria after treatment with destruxin , 210 X 104, 221 X 104, 250 X 104 spores/ml, of newly hatched nymphs last nymphal stage and adult stage., respectively. The results show that, the LC50s of the corresponding stages significantly decreased after treated with the nano-destruxin which is recode, 99 X 104,106 X 104 and 114 X 104 spores/ml . Under semi field condition, the LC50s of newly hatched nymphs, last nymphal stage and adult stages, 210 X 104, 227 X 104 and 224 X 104 spores/ml . The effect of nano-destruxin against S. gregaria under semi-field conditions show that after 20 days, the infestations number were significantly decreased to 2.2±1.2, as compared to 2.4±5.3, and 12.2±2.2 individuals after treated with destruxin and in the control. After 90 days of the post applications, the corresponding infestations, recorded that, 20±8.9, 18±3.4 and 60±4.9 individuals, respectively. After 120 days the infestations number significantly decreased to 29±8.9individuals after treated with nano-destruxin.