2018). This pest is highly polyphagous and migratory in behaviour that can colonize over 80 different plant species of which maize is not an exception. It also attacks crops such as alfalfa, soybean, sorghum (Bohnenblust et al., 2014) cotton and other diverse pasture grasses (Murúa and Virla, 2004). The caterpillar feeds on all stages of the corn plant by consuming the foliage and mostly prefers the young plants (Ameida de Moraes et al., 2015). Rows of perforations are produced in the leaves due to the feeding done in the whorls of the plant
Field experiment was conducted on population dynamics of Aphis gossypii Glover on coriander (Gujarat coriander 2) in relation to biotic and abiotic factors during winter season of 2011-12 and 2012-13. Incidence of aphid on coriander started from 3 rd week of December (51 st SMW) and continued till 1 st week of March (10 th SMW) with a peak level during 5 th week of January (5 th SMW). Minimum and mean temperature had highly significant negative association with aphid incidence during first year, whereas nonsignificant negative correlation with the pest activity during second year. The morning vapour pressure had significant negative relationship with A. gossypii during first year and non-significant negative association during second year. Remaining all the tested meteorological parameters showed non-significant relationship with aphid population on coriander crop during both the years. The biotic factors, viz., coccinellids and syrphids as well as their cumulative numbers showed highly significant positive correlation with aphid population during both the years.
Studies on bio-efficacy of insecticides against castor capsule borer, Conogethes (=Dichocrocis) punctiferalis Guenee on castor were carried out during Kharif, 2011-12. The results on efficacy of insecticides showed that chlorantraniliprole 20 SC @ 0.006 per cent and indoxacarb 14.5 SC @ 0.015 per cent were found superior and recorded 7.92 and 8.12 per cent capsule damage, respectively during spray schedule. At harvest, plots treated with chlorantraniliprole 20 SC (0.006%), indoxacarb 14.5 SC (0.015%) and emamectin benzoate 5 WG (0.002%) had found lower per cent capsules damage. Statistically higher castor seed yield was recorded in chlorantraniliprole @ 0.006% (3185 kg/ha), indoxacarb @ 0.015% (3110 kg/ha) and emamectin benzoate @ 0.002% (2760 kg/ha). However, cost benefit ratio was highest in indoxacarb 14.5 SC (1:16.62) followed by alphamethrin 10 EC (1:15.73) and chlorantraniliprole 20 SC (1:12.02).
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