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Articles by G.K. Ramegowda
Total Records ( 3 ) for G.K. Ramegowda
  Mohd Yaqoob Dar , R.J. Rao , G.K. Ramegowda and Vishal Mittal
  Life history traits of Panonychus ulmi on mulberry (Morus multicaulis) determined under ambient conditions; the temperature and relative humidity were same as that in natural conditions in three seasons of 2012. Developmental time from egg to adult for female and male varied from 12.66-23.24 and 10.62-18.65 days, respectively. Total and daily egg production was highest during summer (34.00 and 4.68 eggs, respectively) followed by spring (27.33 and 3.60 eggs) and lowest during autumn (17.80 and 1.87 eggs). Panonychus ulmi completed its life span in 19.07 and 21.76 days for male and female, respectively during summer and took more than one and half times during autumn. All parameters were intermediate during spring compared to highest during summer and least during winter. Intrinsic rate of natural increase (rm) were 0.091, 0.147 and 0.051 day1 during spring, summer and autumn seasons, respectively. Mean generation time (To) of the population ranged from 18.01 days during summer to 30.80 days during autumn. Based on the observed demographic parameters during three seasons, it is concluded that the summer season with average temperature of 25.72°C is highly favorable for development of P. ulmi.
  Mohd Yaqoob Dar , Asha Singh , G.K. Ramegowda and R.J. Rao
  Background and Objective: Production of quality mulberry leaf and subsequent production of quality silk is hampered due to the incidence of various insect pests. Such incidence of pests has been found to be affected by weather parameters. Strawberry spider mite, Tetranychus turkestani (Ugarov and Nikolskii) have been found to damage large number of agriculture crops. This study was conducted in Pampore of Kashmir valley, India during 2011-2012 cropping seasons to measure the incidence (mite incidence, MI) and severity (percent damage index, PDI) of Tetranychus turkestani on mulberry foliage in relation with climatic factors. Materials and Methods: Observations were made fortnightly on the incidence and severity of pest from May-October along with the influence of weather parameters. Mite species were recorded from May onwards until leaf fall in October during 2011 and 2012. Results: Incidence and severity were lesser during May and reached maximum during 2nd fortnight of July and 1st fortnight of August from there it declined to reach a lower level during 2nd fortnight of October with the onset of leaf fall. Correlations were positive and highly significant for both incidence and severity. The minimum temperature and relative humidity registered significant positive correlation and rainy days showed negative correlation with both MI and PDI. Multiple regression modules with five weather parameters of same and previous fortnight with incidence and severity had higher probability and R2 values. Conclusion: This study showed that T. turkestani is a serious pest to mulberry foliage causing severe damage to its quality and quantity with respect to the weather conditions.
  G.K. Ramegowda , Irfan Illahi , Vishal Mittal , Imtiyaza Akhter , Anil Dhar and M.A. Khan
  This study was conducted at Pampore in Kashmir valley, India during 2009-2011 cropping seasons to measure the incidence and severity of lesser mulberry pyralid, Glyphodes pyloalis Walker (Lepidoptera: Pyralidae) (LMP) and mulberry looper, Hemerophila atrilineata Butler (Lepidoptera: Geometridae) (ML). Fortnightly observations were made on incidence and severity from May to October. Influence of weather parameters on the seasonality and severity LMP and ML was quantified. LMP was recorded from July onwards until leaf fall in October during 2009 and 2010. It was recorded early during 2011 by May 2nd fortnight. Incidence and severity levels of ML were relatively lower compared to that of LMP. During 2009 and 2010 mulberry looper prevailed from July onwards till leaf fall in October. In contrast, during 2011 ML appeared a month late from August 2nd fortnight onwards with a steep increase during last two intervals of observation. Correlations were negatively significant at p = 0.01 for LMP incidence with minimum and maximum temperatures and number of rain days during same fortnight (SFN). Severity of LMP with preceding second fortnight’s morning relative humidity was negative and significant at p = 0.01. Correlations for both incidence and severity of ML with minimum temperature of SFN were negatively significant at p = 0.01. Multiple regression modules with weather parameters of SFN had higher probability and R2 values. There is need to continue the studies to establish precise relations with weather and pest incidence and severity.
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