Growth Regulating Action of Leaf Extract of Cataranthus Roseus on Development of Spodoptera Litura

Feeding deterrents or antifeedant chemicals are those chemicals which inhibit feeding of insect on a treated food material without necessarily killing or repelling them. Plants with ant feeding properties are increasingly being used against phytophagous insect pests for protection of crops. In the present study of growth regulating action of Leaf extract of Catharanthus roseus on development stages of Spodoptera litura. Results show that growth regulating effect of C.roseus was more profound when larvae were treated with the leaf extract by topical application method. Highest mortality of 44.16 percent was observed during development when 2 instar larvae of S.litura were treated with 0.5% extract (compared to 13.35 percent in control). At the concentrations of 0.01, 0.05 and 0.1% total mortality recorded was 21.00, 24.99 and 36.66 percent respectively Total mortality caused during development was maximum of 44.16 percent when second instar larvae were treated with the leaf extract of Catharanthus roseus at 0.5%.