Management of Kalahasti Malady (Tylenchorhynchus brevilineatus) of groundnut through crop rotation

Field experiments with 15 crop rotation treatments were conducted in farmers field at Guttivaripalli, Chittoor district, Andhra Pradesh, to determine the effect of crop rotation on kalahasti malady. Rabi groundnut preceded by summer rice and kharif rice recorded maximum decrease in nematode population (59.7%), disease severity (42.6%) and increase in pod yield (83.3%). This was closely followed by the two cropping sequences viz., rabi groundnut preceded by summer rice and kharif sunhemp and rabi groundnut preceded by kharif rice. Blackgram, greengram and maize proved to be susceptible hosts for the nematode.