Plant-parasitic nematode densities in cereal and legume based cropping systems on vertisols uri icon

abstract

  • Densities of plant-parasitic nematodes in traditional, low-input cropping systems were 3 times lower than in high input cropping systems in Andhra Pradesh, India, during 1991-93. Sorghum/pigeonpea (intercropped), soyabean/pigeonpea (intercropped) and green gram (Vigna radiata) were identified as systems very conducive to the build up of Heterodera cajani. Very high population densities (>3500 nematodes/100 cubic cm soil) of Rotylenchulus reniformis were recorded on sunflower. The densities of plant parasitic nematodes did not increase significantly in plots that were either fallowed or sown with pearl millet (Pennisetum glaucum) in the rainy season. A summer fallow period between Feb. to June reduced the soil densities of all plant parasitic nematodes by 42%;R. reniformis population was reduced by 80%. H. cajani, Tylenchorhynchus sp. and total plant parasitic nematode densities were significantly higher in plots treated with inorganic fertilizers than in plots treated with farmyard manure. R. reniformis densities were higher in irrigated than in rainfed fields., 17 ref., Densities of plant-parasitic nematodes in traditional, low-input cropping systems were 3 times lower than in high input cropping systems in Andhra Pradesh, India, during 1991-93. Sorghum/pigeonpea (intercropped), soyabean/pigeonpea (intercropped) and green gram (Vigna radiata) were identified as systems very conducive to the build up of Heterodera cajani. Very high population densities (>3500 nematodes/100 cubic cm soil) of Rotylenchulus reniformis were recorded on sunflower. The densities of plant parasitic nematodes did not increase significantly in plots that were either fallowed or sown with pearl millet (Pennisetum glaucum) in the rainy season. A summer fallow period between Feb. to June reduced the soil densities of all plant parasitic nematodes by 42%;R. reniformis population was reduced by 80%. H. cajani, Tylenchorhynchus sp. and total plant parasitic nematode densities were significantly higher in plots treated with inorganic fertilizers than in plots treated with farmyard manure. R. reniformis densities were higher in irrigated than in rainfed fields

publication date

  • 1994