Dr. D. M. KoratKAVAD NILESH K.2017-04-272017-04-272013http://krishikosh.egranth.ac.in/handle/1/5810010225Investigations on biology and activity of Diaeretiella rapae (McIntosh) an endo parasitoid of aphids infesting cruciferous crops were carried out at Biological Control Research Laboratory as well as Agronomy farm of B. A. College of Agriculture, Anand Agricultural University, Anand (Gujarat) during 2011-12 and 2012-13. Studies on biology of D. rapae revealed that the egg to pupal period ranged from 8 to 10 days with an average of 8.83 ± 0.83 days. Longevity of male and female was 7.06 ± 0.83 and 5.50 ± 0.51 days, respectively. Entire lifespan of female and male was 15.90 ± 0.99 and 14.33 ± 0.99 days, respectively. Sex ratio (male : female) of the parasitoid was 1 : 1.40 in laboratory reared adults. Morphometry observations of adults revealed that the females were relatively larger in size than males.enAgricultural Entomology,StudyStudyThesis