부산대학교 도서관

The study was conducted to analyse the influence of increased temperature and carbon dioxide levels on biological parameters of Plutella xylostella on cauliflower. Insect population was collected from two locations viz. Ludhiana and Malerkotla. Study was conducted at six different combinations of temperature and CO2 levels viz. 25:11 °C and 28:14 °C at 350, 400, 450 ppm carbon dioxide concentrations. The incubation period of eggs decreased non-significantly with increase in temperature and CO2 levels in population of both the locations. In Ludhiana population, total larval duration, pupal duration, female adult longevity and male adult longevity decreased from 11.68, 4.32, 14.17, 20.51, respectively at 25:11 °C to 10.02, 3.71, 11.14, 16.62 days, respectively at 28:14 °C. Similarly, when CO2 levels increased from 350 to 450 ppm, the total larval duration, pupal duration, female adult longevity and male adult longevity decreased from 11.43, 4.22, 13.85, 20.17 to 10.30, 3.77, 11.37 and 16.90, respectively. Whereas fecundity of P. xylostella increased significantly from 165.56 to 186.00 eggs female−1 with increase in temperature and from 167.50 to 183.67 with increase in CO2 levels. Similarly in Malerkotla population fecundity increased with the increase in temperature and carbon dioxide levels. Increase in fecundity and decrease in longevity will effect generation time which could lead to more number of generations per year by the virtue of Plutella xylostella will cause more damage to the Cole crops.