Abstract
The effect of sowing date of groundnut on the population buildup of tobacco caterpillar, Spodoptera litura (Fab.) and its effect on leaf damage (%) and yield was studied at the Agricultural Research Farm of the Banaras Hindu University, Varanasi, Uttar Pradesh, India during rainy season consecutively for three cropping years. The tobacco caterpillar average population and groundnut leaf damage (%) was found maximum in the groundnut crop sown on 20th July followed by 5th July and 20th June during all the three years of study. The first infestation of tobacco caterpillar was observed at 45 days after sowing which disappeared 135 days after sowing. The interaction effect of sowing dates and the periods of observation on the leaf damage was found significant. The yield recorded from groundnut crop sown on 20th June was found maximum while the crop sown on 20th July recorded minimum yield.
Highlights
Groundnut (Arachis hypogaea L.) is an important oilseed crop which occupies first place in India in respect of acreage and production
Kathryn et al, (2014) reported on the basis of their experiment that sowing dates can be used as a pest control measure against insect pests of chilli, it is concluded that early sowing (January 15th or January 30th) resulted in low incidence of aphids, thrips, jassids, whitefly and fruit borer except mites
The population of tobacco caterpillar recorded in the groundnut crop sown on 20th June, 5th July and 20th July during different years of study differed significantly
Summary
Groundnut (Arachis hypogaea L.) is an important oilseed crop which occupies first place in India in respect of acreage and production. Kathryn et al, (2014) reported on the basis of their experiment that sowing dates can be used as a pest control measure against insect pests of chilli, it is concluded that early sowing (January 15th or January 30th) resulted in low incidence of aphids, thrips, jassids, whitefly and fruit borer except mites. Such low level of insect pest caused less crop injury which resulted in enhancing green pod yield of chilli. Keeping these facts in view, the effect of sowing dates of groundnut on the population of tobacco caterpillar, Spodoptera litura (Fab.), and its effect on leaf damage and yield of groundnut was studied
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