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In this study the potential acaricidal activity of three species of Cinnamomum viz., C. camphora, C. zeylanicum and C. tamala was ascertained by using the methanol extracts from the leaves and barkagainst Tetranychus urticae Koch infesting tomato. The leaf extracts were evaluated at 4% and 8%concentration and bark extracts at 3% and 6%. The leaf extracts of all the three species of Cinnamomum @ 8% resulted in significant walk-off (repellence) of spider mites from the treatedleaves up to 24 hours, the highest repellency was with C. camphora (59%) which also caused highmortality of mites (48%). On tomato leaves treated with Cinnamomum extracts, spider mite females laid less number of eggs (31 to 50/female) compared to that on the untreated leaves (121eggs/female) and the Oviposition Deterrent Index (ODI) ranged from 41 to 59. Also compared tounexposed spider mite females, the ones exposed to Cinnamomum extracts lived short (16 to 23days) with an apparently short egg laying period (14 to 21 days).
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