Seasonal incidence and natural enemies of leaf webber cum fruit borer, Pempelia morosalis (Saalm Uller) on Jatropha inVindhyan region

摘要

During 2009-2010, maximum infestation of leaf webber in the field was found in mid of October with a mean population of 4.70 larvae/5 plants, damaging to a level of 29.9 %. Highest natural parasitisation of leaf webber by Tachinid spp. was 35.9%, while 33.4% larvae were parasitized by Bracon hebetor. The infestation by leaf webber larva and plant infestation was positively correlated with maximum and minimum temperatures and sunshine. Parasitism of leaf webber by tachinid fly and B. hebetor showed positive correlation. In the year 2010-2011, peak incidence of leaf webber was during mid of September with a mean population of 5.80 larvae/5 plants with corresponding 26.5% plant damage. Maximum parasitisation of leaf webber by Tachinid spp. and Bracon hebetor 36.0 and 28.4%, respectively. Leaf webber larval population and plant infestation showed positive correlation with maximum and minimum temperatures, morning and evening relative humidity and rainfall. Negative correlation was found between leaf webber larval population, tachinid fly and B. hebetor.