Research
Characterization of Environmental Conditions Conducive For Spread of Whitefly Population and Epidemic Development of Chilcv
Chilli (C.annum L.) is one of the main solaneaous crop in Pakistan and treated by many viral diseases. This experiment was performed to check the effect of environmental conditions on whitefly population and disease incidence development as well as correlation and regression analysis of environmental factors like maximum, minimum temperature, relative humidity, rainfall and wind speed with whitefly population on Chilli plants. For the determination of effect of environmental factors on the incidence of virus and whitefly Population, five environmental factors were kept in consideration which were maximum temperature, minimum temperature, relative humidity, rainfall and wind pace. The data recorded on disease incidence and whitefly population was subjected to correlation and regression analysis for determining the relationship between environmental variables and incidence of disease and whitefly population. All environmental parameters including (maximum temperature, minimum temperature, and relative humidity) showed positively significant correlation and wind speed and rainfall showed negatively significant correlation.
Comparative Efficacy of Insecticides and Plant Extracts For Management of Chilcv Disease In Relation to Epidemiology
Three Chilli varieties/lines including 7-ph, Biaddy and Tatapuri were sown to check the comparative efficacy of different insecticides and plant extracts. Three insecticides including Imidacloprid, Bifenthrin and acetameprid and three different plant extracts including onion extract, Garlic extract and parthenium were evaluated against Chilli leaf curl virus (ChiLCV) and whitefly. Bifenthrin was very much effective in reducing whitefly population while Acetameprid was least effective as compared to control. Garlic extract at 5% concentration was very much effective in reducing whitefly population while parthenium extract at 5% concentration was least effective compared to control. Correlation of environmental factors (maximum and minimum temperature, relative humidity and rainfall) chiLCV disease incidence % was also determined. There was a significant correlation of environmental variables with ChiLCV disease incidence %. The use of Bifenthrin (10%EC) proves to be significant option in case of epidemiological occurrence of environmental variables followed by acetamaprid (20%SL) and imidacloprid (25%WP) respectively.
