STUDIES ON SEASONAL INCIDENCE OF PESTS ON Jasminum spp. EMPHASIZING ON BUD BORER COMPLEX AND THEIR MANAGEMENT ON Jasminum multiflorum (BURM. f.) ANDREWS
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Date
2016-11-18
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University of Horticultural Sciences, Bagalkot (COLLEGE OF HORTICULTURE, GKVK POST, BANGALURU)
Abstract
Seasonal incidence of pests on Jasminum spp. emphasizing on bud borer complex and their management were undertaken at College of Horticulture, Bengaluru during 2015-16. Among the pest species observed, eriophyid mite was predominant on J. multiflorum and was significantly and positively influenced by maximum temperature followed by bud and shoot worm. Peak incidence of bud worm was noticed during February with negative significant correlation with morning and evening relative humidity. Shoot web worm and thrips had a significant positive correlation with maximum temperature. An unidentified pupal parasitoid (Hymenoptera: Ichneumonidae) on Elasmopalpus jasminophagus, two Hymenopteran larval parasitoids, Dolichogenidea stantoni (Braconidae) and Tetrastichus sp. (Eulophidae) on both, E. jasminophagus and Hendecasis duplifascialis were documented. Among the four jasmine species observed viz., J. multiflorum, J. sambac, J. auriculatum and J. grandiflorum only J. multiflorum and J. sambac were severely infested by H. duplifascialis and E. jasminophagus whereas, J. grandiflorum was completely free from bud borers. Total life cycle of E. jasminophagus on J. multiflorum lasted for 32 to 41 days under laboratory and 31 to 40 days under field conditions with five larval instars. Average fecundity was 50 eggs per female and laid preferably on green bud calices. Among six insecticides and two botanicals evaluated against bud borers of J. multiflorum, chlorantriniliprole 18.5 SC @ 0.2 ml/l, profenophos 50 EC @ 2 ml/l, quinolphos 25 EC @ 2 ml/l, spinosad 45 SC @ 0.2 ml/l and NSKE (5%) recorded lower larval population with higher yield and cost benefit ratio.