Screening of Onion and Garlic Genotypes for Resistance against Thrips tabaci Lindeman in Mid-Hill Regions of Himachal Pradesh
Keywords:
<I>Allium cepa, Allium sativum</i>, Thrips, Germplasm, Screening.Abstract
In order to explore the possibility of sources of resistance and relative tolerance of cultivars based upon the damage inflicted, studies were undertaken to evaluate onion and garlic entries/genotypes during February-April, 2016. The screening of the genotypes revealed thrips population to remain low till the end of March which attained peak in the first week of April. Mean thrips population count on onion was maximum on ON-14-01 being at par to ALRO 213, ON14-04 and minimum on genotype OLR 1352 which being at par with ON 15-16 and OLR 1372. Among the garlic genotypes AVT-2/GRL-1351 and AVT-1/GN-14-25 showed maximum thrips population whereas GRL-1349 and AVT-1/GN14-23 sustained minimum population. Foliar damage varied from 4.90 to 25.40 per cent and 0 to 6.6 per cent in onion and garlic, respectively. Correlation of population build-up with environmental factors showed positive correlation with prevailing temperature but negative with rainfall, relative humidity, wind speed and sunshine hours for both the crops but correlation with maximum relative humidity and wind speed was significant for onion crop only.Downloads
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