Effect of weather parameters on the incidence of major insect pests and their natural enemies in few selected kharif and rabi crops
Loading...
Files
Date
2013
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
UAS Dharwad
Abstract
Field studies were carried out to address the effect of weather change on the incidence
of insect pests during kharif and rabi 2011-12 and 2012-13 at the Main Agricultural Research
Station, Dharwad. Forecasting model for pod damage in greengram depicted minimum
temperature and rainy days at four weeks lead time is consistently significant positively
associated.
Higher shoot fly eggs in kharif sorghum were noticed with increase in both minimum
temperature and morning RH. At three week before, incidence of deadheart had positive
relationship with evening RH and significant negative association with maximum
temperature. Forecasting model for per cent defoliation in soybean at two weeks prior
showed that morning RH is consistently significant negative association in normal sown crop.
However, rainfall had significant positive relationship with foliage damage.
Forecasting model for per cent pod damage due to Helicoverpa armigera in chickpea
at four weeks before showed minimum temperature is consistently highly significant and
negatively associated. Forecasting models developed for deadheart due to shoot fly in M-35-
1, at three week before in late sown crop and minimum temperature only had highly
significant positive correlation, whereas, in DSV-4, evening RH had highly significant
positive relationship. Forecasting model for aphids per 5cm central twig in safflower showed
that solar radiation at four weeks prior is consistently significant and negatively associated.
In intercrop, Bt, spinosad, emamectin benzoate and RPP spray efficacy on
lepidopteran pests was higher with rise in evaporation, solar radiation and maximum
temperature. Whereas, Beauvenia bassiana showed higher efficacy with rise in morning RH
and minimum temperature.
Validation of forecasting model for per cent deadheart due to shoot fly infestation on
rabi sorghum in late sown condition resulted lead week three model gave minimum error
(3.66) and performed better in 2008 than 2009 and 2010 years with high R2 value of 0.71.