Seasonal Occurrence of Jassid (an Insect Pest) on Bt. Cotton in Sourthern Punjab, Pakistan
Seasonal Occurrence of Jassid (an Insect Pest) on Bt. Cotton in Sourthern Punjab, Pakistan
Zeshan Siraj1*, Amjad Farooq1 and Zahid Mehmood2
ABSTRACT
The current study was conducted to find out the population dynamics of Jassids in relation to climatic factors (air temperature, relative humidity and rainfall) on different cultivars of Bt. cotton from May-November 2011 -May-November 2013 at cotton research institute, Multan, Pakistan, Jassids appeared in 21st Standard Meteorological Week(SMW)and attain its peak in 36th SMW. Maximum and minimum mean population of jassids (4.19±0.16 and 0.03±0.13 per leaf) was observed in September and November 2011, respectively. Maximum and minimum population of jassids (2.43±0.11/leaf) and (0.00±014/ leaf) was recorded in 2012 September and November whereas maximum and minimum infestation of jassids 3.59 ±0.06 and 0.03±0.12 (per leaf) was observed in September and November 2013. Jassids population was recorded above the economic threshold level (ETL) in all three years. Jassids infestation was non-significantly correlated with temperature, relative humidity and average rainfall in all consecutive years 2011-2013. Data revealed that jassids population had a positive non-significant correlation with minimum temperature and minimum relative humidity in 2011 and 2013. A positive association of jassids with maximum temperature was observed in 2012-2013 whereas it was negatively correlated in 2011. Jassids infestation was negatively associated with average rain fall in 2011 and 2012 and had a positive relationship in 2013. A positive correlation of jassids with maximum humidity was observed in year 2011 and 2012 however it was negatively associtated in 2013. Peak infestation of average population of jassids was recorded in September .The present research concluded that infestation of sucking pest jassids is more frequent in Mid of September , therefore it is recommended for local farmers to do some control measures to avoid attack of jassids in this month priorly in order to reduce the economic loss,.It was concluded that mid of September was more suitable for incidence of jassids
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