Efficacy of 0.01% fenvalerate, 0.07% endosulfan and 0.1% dichlorvos for the control o! Plutella xylostella on cabbage was evaluated using three experimental designs viz.. randomized block, serial block and exploded biock design. The results indicate probability of incorrect inferences that could be drawn for efficacy reports when randomized block design and serial block design are followed due to interplot movement of insects. Based on the results obtained, suitability of adopting modified exploded block design which has limited interplot movement has also been indicated for testing insecticides with varying efficacy.
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