National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692 Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
A field experiment to study the seasonal incidence of mealybug on grapevine was conducted at Grape Research Station, Rajendranagar, Hyderabad from July, 2014 to March, 2015. Studies on seasonal incidence of mealybug of grapevine in relation to abiotic factors were carried out during 2014-15 (July to March). The incidence of mealybug on grapevine started increasing from the first standard week of January 2015 and continued to increase thereafter till the end of the season up to harvesting of bunches. Higher incidence of mealybug colonies coincided with the fruiting stage and mealybugs were observed on the bark also. Correlation studies of mealybug population with weather parameters indicated that weather had a substantial influence on its incidence. Among the various weather parameters, morning relative humidity (r = -0.6500***) and evening relative humidity (r = -0.5429***) had maximum impact (significant and negative, p < 0.001) on mealybug incidence. Maximum temperature (r = +0.4074*) and sunshine hours (r = +0.3445*) had significant (p < 0.05) positive influence on the pest. The other factors did not influence pest incidence significantly. This explains the higher incidence levels in summer months when relative humidity is very low, maximum temperature and sunshine hours are higher. However mealybug incidence correlated negatively and non-significantly with minimum temperature (r = -0.0485), rainfall(r = -0.1130) and wind speed(r = -0.2256).
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