Abstract
Relative toxicity of (07) seven plant extracts (Azima tetracantha, Chloroxylon sweietenia, Clerodendrum viscosum, Cleistanthus collinus, Lippia javanica, Ocimum americanum and Sphearanthus indicus) to (04) four test insects (Hyblea purea Tinolius eburneigutta, Eutectona machearalis, and Atteva fabricella) at different concentrations of was done and toxicity was observed in all the plant extracts based on the feeding behavior of the test insect and arranged in the descending order is 1.0%>0.8%>0.6%>0.4%>0.2%>0.1% concentrations and uncontrol. All insect cultures were maintained in a growth chamber in the laboratory at a temperature of 27 ± 2° C, 12: 12 L:D and with 70 ± 5 % RH during the experiments. Among all plant extracts O. americanum (LC50-0.3169 and LC50-0.3115 against H. purea and E. machaeralis) followed by C viscosum (LC50-0.4316 and LC50-0.5253 against T. eburguneita and A. fabricella) were found to be effective and more toxic against selected major insect pests that tested.
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