Faunistic survey of plant parasitic nematode and wilt disease infecting pea.

摘要

A survey on plant parasitic nematodes and wild disease of pea crop grown in Uttar Pradesh, India, especially in areas covering the central part such as Kanpur (New Dairy Farm, Oilseed Farm, Vegetable Research Farm, Uttaripura Res. Farm and IIPR Farm) and Allahabad (Ghoopur village, New Jhusi and Allahabad Agricultural Institute Farm), was conducted. The root knot nematode Meloidogyne incognita (Mi) recorded the highest frequency (73.0) and relative frequency (26.5) of occurrence on pea, among the nematodes found (Helicotylenchus elegans, H. aquli, Hemicriconemoides cocophillus, Hoplolaimus indicus, Pratylenchus zeae, P. thornei, Rotylenchulus reniformis, Tylenchorhynchus nudus and Xiphinema insigne). This nematode was isolated from both locations with unthrifty growth and yellowing of foliage with marked swelling on the root system. Fusarium oxysporum f.sp. pisi (Fop) was also found in wilt-affected pea plants. Both the disease-causing agents were found in almost all the commercial pea growing areas. Plants of pea cv. Boneville were highly susceptible to both Fop and Mi. The close observation under filed conditions revealed that this cultivar wilted quite early in the patches where crop was affected by the root knot nematode. Out of 5 locations in Kanpur, the Mi infestation was the maximum in the Vegetable Research Farm and wilted plants were also high in number, attributed to probably continuous cultivation of pea during rabi. In Allahabad, village Ghoopur was found to be very much affected with root knot and wilt disease symptoms.