Control of citrus nematode, Tylenchulus semipenetrans in Nagpur Mandarin Orchard

A field trial for the control of the citrus nematode, Tylenchulus semipenetrans in a ten year old Nagpur mandarin orchard on rough lemon rootstock showed that the application of carbofuran 3G and phorate 10G, each at 1, 3 and 5kg a.i/ha reduced the nematode (Tylenchulus semipenetrans) populations in soil and on roots significantly within one month of nematicide application. The repeated application of the nematicides after one year kept the namatode populations significantly lower as compared to non-repeated and check treatments. Increase in canopy volume was also significant in treatments where carbofuran and phorate were applied at 5kg a.i/ha during first year and in repeated treatments during second year. In second year, the fiuit yield was increased by 32.4 and 29.7% over check in the repeated treatments where carbofuran and phorate were applied each at 5 kg a.i/ha.