Document Type : Original Article
Authors
1
Plant protection Department, Faculty of Agriculture, South Valley University, 83523 Qena, Egypt
2
Scale Insects and Mealybugs Research Department, Plant Protection Research Institute, A.R.C, Dokki, 12511 Giza, Egypt
Abstract
On citrus leaves, a laboratory trial was conducted to test the effect of several compounds against the nymphs of the cottony cushion scale, Icerya purchasi, under laboratory conditions at Plant Protection Dept., Faculty of Agriculture, South Valley University, Qena governorate, Egypt. Two insecticides (thiamethoxam 25% and malathion 57%), mineral oil (active cable 2), three plant oils (clove oil, mint oil and ginger oil) and two plant extracts (garlic and moringa) were used. The results demonstrated that under laboratory circumstances, the investigated substances on I. purchasi were varied. The tested compounds could be descendingly arranged as follows: thiamethoxam 25%, malathion 57%, active cable 2, clove oil, mint oil, ginger oil, garlic and moringa. The corresponding LC50 values after 72 h. were 0.02, 0.24, 0.91, 3.11, 3.44, 4.17, 31.36 and 35.06 ppm. While, LC90 values were 0.10, 1.11, 4.56, 6.87, 7.92, 11.36, 121.96 and 178.86 ppm. Also, the insecticidal efficiency of thiamethoxam 25% and malathion 57% showed the highest toxicity against nymphs of scale insect on citrus leaves, while the plant extract, moringa showed the lowest effect.
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