EFFECT OF ORGANIC SOURCES OF NUTRIENTS ON DEFOLIATOR, Catopsilia pjwanthe (L.) (LEPIDOPTERA: PIERIIDAE) OF SENNA
A field experiment was conducted at Agricultural College and Research Institute, Madurai during March - September 2007 to evaluate the influence of various organic sources of nutrients on defoliator, Catopsi/ia pyranthe (L) ofsenna. It was found that senna plots applied with vermicompost (2t1ha) + neem cake (250 kg/ha) + bio-fertilizers (2kg/ha) + NPK (40:40:40 kg/ha) had significantly less incidence of defoliator, recording the overall mean leaflet damage of 3.5% in main crop and 2.1% in ratoon crop. Leafsamples obtained from senna plots applied with vermicompost + neem cake + bio-fertilizers NPK recorded higher phenol, ash and sennoside contents and the same treatment enriched the population of beneficial micro-flora like consortia of bacteria, fungi and actinomycetes in soil. Yield in the effective treatment was the highest of 1544.0 kg dry leaves/ha and 546.7 kg pods/ha with cost benefit ratio of I: 1.28.
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