Yadav, D. N.PATEL, H. M.2018-07-122018-07-121987http://krishikosh.egranth.ac.in/handle/1/5810059564Captopsilia pyranthe Linn. (Lepidoptera : Pieridae) has been reported as a serious defoliator of a medicinal crop, Senna, Cassia angustifolia Vahl. Studies on its biology, seasonal abundance, natural enemies and chemical control were carried out at Anand Campus of Gujarat Agricultural University during 1983-84 and 1984-85. Biological observations revealed that, the pest lays eggs singly on the foliage which hatch out in two days. It passed through five distinct larval instars to complete its development and duration of each instar was on an average 1.20, 1.12, 1.32, 1.68 and 2.83 days during June (when average minimum and maximum temperatures were 30.49 °C and 38.00 °C and relative humidity was 68.3 per cent and 1.73, 1.33, 1.60, 1.93 and 3.13 days during September and October (when average minimum amd maximum temperatures were 27.71 °C and 34.75 °C respectively and relative humidity was 59.09 per cent) respectively.enAGRICULTURAL ENTOMOLOGY, AGRICULTUREA STUDYThesis