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Evaluation of Bacillus thuringiensis to Control Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) under Laboratory Conditions
University of Basrah, Basrah, Iraq
Department of Plant Protection, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
Department of Plant Protection, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
- 1 University of Basrah, Basrah, Iraq
- 2 Department of Plant Protection, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
- 3 Department of Plant Protection, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
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Abstract
The tomato leaf miner, Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) is among the most destructive pests that attack tomato in many countries. In this study, the efficiency of three suspensions (10 6 ; 10 5 ; 10 4 cell/ml) of Bacillus thuringiensis var. Kurstaki was tested on T. absoluta larvae 1 st , 2 nd , 3 rd and 4 th instar was assessed to study the effect of these suspensions on larval mortality. Results showed that the concentration 10 6 cell/ml resulted in the highest mortality of all instars larvae with an average mortality of 20%, 22.66%, 18.66% and 23.33% was recorded for the first, second, third and fourth instar, respectively. The greatest percentage of mortality occurred in the third day after the larvae fed with leaves treated with suspension B. thuringiensis.
KeywordsBacillus thuringiensis var. KurstakiThree SuspensionsTuta absolutaMortalityFour Larvae Instar
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