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Effect of cotton sowing date on the population buildup of sucking insect pest complex on NIAB-78 cotton variety



Effect of cotton sowing date on the population buildup of sucking insect pest complex on NIAB-78 cotton variety



Proceedings of Pakistan Congress of Zoology 25: 33-40



The study was conducted in the field of Bukera Agriculture Farm, Taluka Tando Allahyar, Distt: Hyderabad, Sindh. The seed of cotton variety NIAB-78 was sown at fortnight intervals i.e. 1(st) May, 15(th) May and 29(th) May 2000, respectively. The population counts of jassid. thrips and white fly were made at weekly intervals starting from June. 18. 2000. Both staves i.e. adults and nymphs were recorded. The results showed that the population density of jassid was above economic threshold level during July, in almost all three sowing dates. The over all sowing dates response to Jassid attack revealed that minimum population (4.18 +/- 0.64 jassid/plant) was in cotton sown on 15 h May followed by sowing dates of 29(th) May (5.20 +/- 1.10 jassid/plant) and 1(st) May (5.21 +/- 1.17 jassid/plant). Whereas, the Population densities of thrip on different sowing dates was maximum (12.4 +/- 4.58 thrips/plant) recorded in cotton sown on 15 h May. The Minimum population of thrips was recorded on 29th May (7.73 +/- 1.99 thrips/plant) and the moderate level of infestation was found in cotton sown on 1(st) May. (10.01 +/- 4.0 thrips/plant). However. the population of white flies revealed a comparatively lower trend than jassid and thrip. The result on seed cotton yield showed that the yield of cotton was significantly different at three sowing dates. The seed cotton yield (211 kg/plot) was higher in cotton sown on 1(st) May compared to the one sown on 15(th) May (171 kg/plot) and 29(th) May (192 kg/plot).

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