SCREENING OF CHILLI GERMPLASM AND BIO –INTENSIVE MODULES FOR THE MANAGEMENT OF CHILLI THRIPS AND MITES
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Date
2018-07
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University of Horticultural Sciences, Bagalkot (COLLEGE OF HORTICULTURE, GKVK POST, BANGALURU)
Abstract
Investigations were undertaken at Horticulture Research and Extension Centre, Devihosur, Haveri district, Karnataka during kharif 2015. There was a significant variation among the 46 genotypes evaluated against thrips and mites under field conditions. Seven chilli germplasm lines viz., DCA-1, DCA-29, DCA-17, DCA-6, DCA-16, DCA-12 and DCA-15 have been found promising with least population density (0.18 to 0.61 thrips/leaf ; 0.22 to 0.66 mites/leaf) and damage by thrips (0.25 to 0.85) and mites (0.40 to 0.97) and these germplasm may be explored further in resistance breeding. Chilli germplasm line, DCA-23 (2.27, 1.92 & 2.25, 2.52) may be used as a susceptible check along with Byadagi Kaddi (1.92, 1.67 & 2.12, 2.12) and Byadagi Dabbi (2.10, 1.55 & 1.95, 2.12). Survey carried at green and red chilli stages in three districts i.e., Haveri, Kolar and Bengaluru urban districts showed that incidence of chilli thrips and mites was heavy in Haveri district (0.22, thrips/leaf, 0.10 mites/leaf, 1.22 LCI due thrips & 0.65 due to mites, respectively) and was least (0.06, 0.03, 0.32 & 0.32) in Bengaluru urban. Among the five bio intensive modules evaluated against chilli thrips and mites, based on the pest population and LCI, the Module - T5 comprising of two rows of sorghum border crop around chilli, vermicompost (1 t/ha) + neem cake (2.5 q/ha in two splits at 2 week after transplanting (WAT), sprays of Lecanicilium lecani (2 g/l at 7 WAT), Neemazol 10,000 ppm (2 ml/l at 9 WAT) and diafenthiuran 50 WP (1 g/l at 11 WAT) has recorded least thrips (0.68, 0.44, 0.29 and 0.07 thrips/leaf) and mites (0.03, 0.06, 0.03 and 0.03 mites/leaf) with lowest LCI due to thrips (0.44, 0.56, 0.46 & 0.63) and mites (0.10, 0.20, 0.10 & 0.10) at 7th, 9th, 11th and 13th WAT, respectively with highest benefit cost ratio (3.22) among the bio intensive modules.