An investigation was carried out at AICRP on cotton scheme, Chamarajanagar, Karnataka during kharif season of 2016-17 and 2017-18 to evaluate the bio-efficacy of pyriproxifen 10% EW against sucking insect pests of cotton viz., whitefly (Bemisia tabaci Genn.), aphids (Aphis gossypii Glover), thrips (Thrips tabaci Lind), and leafhopper (Amrasca bigutulla bigutulla Ishida). The study indicated that spraying of pyriproxifen 10% EW @ 200 g.a.i/ha has recorded significantly higher seed cotton yield (19.43 q/ha) with maximum per cent reduction in whiteflies (95.28%), aphids (90.04%), thrips (98.78%) and leafhoppers (94.40%), respectively. Followed by spraying pyriproxifen 10% EW at 125 g.a.i/ha. However, all the insecticide treated plots were superior in reducing the pest load as compared to un treated control.
Among pulse crops, green gram is an important annual legume grown principally for its high protein seeds that are used as human food (Singh et al., 1988). The wild mung bean progenitor of present day cultivated species is widely distributed in the
A field experiment was conducted at AICRP on cotton, Haradanahalli, Chamarajanagara during kharif 2018 to know the population dynamics of insect pests of cotton on HB2110 cultivar. The peak incidence of aphids (64.28 aphids/3 leaves), leafhoppers (5.24 leafhoppers/3 leaves), thrips (5.51 thrips/3 leaves) and whiteflies (4.97 whiteflies/3leaves) were observed during 36, 28, 40 and 38 th SMW. Pink bollworm incidence was started during 32 SMW and attended its severity at 46 th (15 larvae/20 bolls).The correlation results of the meteorological variables with insect population revealed that aphids, thrips, whiteflies and PBW showed significant positive correlation with maximum temperature while, leafhopper showed positive non-significant correlation. However, all the above pests showed nonsignificant negative correlation with minimum temperature, evening relative humidity and rainfall except leafhopper and aphids showed significant positive correlation and non-significant negative correlation with morning relative humidity, respectively.
Genotypic coefficient of variability gives the magnitude of genetic variance present in the population. The heritability in broad sense is a measure of proportion of total genetic variance reflecting the performance repeatability and its appropriate estimate for clonally propagated crops like sugarcane. The genetic advance as per cent mean summarizes the information contained in the heritability and genotypic coefficient of variability. Hence, the information on these parameters is of paramount importance to sugarcane breeders.
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