ABSTRACT
Studies on reproductive biology of yellow stem borer, Scirpophaga incertulas walker in the changing climate scenario conducted at Agriculture Research Station, Gangavathi during 2020-22.Results on post eclosion behavior of yellow stem borer revealed that the maximum female moths emerged between 18:00 and 21:00 hrs from among the emerged moth the female calling was observed between 23:00 and 02:00 hrs. The time of mating commenced after the calling period and was observed between 23:00 and 03:00 hrs. The average pre-oviposition period, oviposition period and post-oviposition period were completed in 1.09 ± 0.09, 1.28 ± 0.17 and 0.85 ± 0.25 days, respectively. The longevity of adult females and males was about 3.23 ± 0.29 and 2.66 ± 0.33 days, respectively. The total number of eggs laid varied from 68 to 221 in number with an average of 146.95 ± 43.98 per female. The Operational and intrinsic sex ratio of YSB were observed to be female-biased with 1:1.35 and 1:1.44 of male to female moths, respectively.
ABSTRACT
Four genotypes of groundnut (Arachis hypogaea L.) viz., K-6, Naryani, Darani and K-9 were raised under Free Air Temperature Elevated (FATE) condition. The plants were raised in open rings with elevated temperature (+3°C) and carbon dioxide (550ppm) during rabi 2016 to investigate the effect of increased temperature and its interaction with CO2 on various seed quality parameters. The physiological parameters decreased under elevated CO2 and temperature. The results revealed that germination ranged from 81.5 to 90 per cent between four genotypes i.e., K-6, Naryani, Darani and K-9. Similarly speed of germination 49 to 83.02, shoot length 14.73 to 7.70, root length ranges from 20.80 to 9.50, and seedling vigour index 123.47 to 98.53 and seedling dry weight 0.919 to 0.100 g. Further, biochemical parameters like SOD, MDA and ? amylase content increased at eT + eCO2 as compared to control treatment. Limited evidence suggests that only short periods of high-temperature stress at critical seed development stages are required to reduce seed vigour, but further research is required. The predicted environmental changes will lead to losses of seed quality particularly for seed vigour and possibly germination.The present study shows that temperature impacts the groundnut crop’s physiological and quality parameters.