Division of Mycology and Plant Pathology, Indian Agricultural Research Institute, New Delhi-110 012.
** Part of the thesis submitted for the degree of Doctor of Philosophy.
Estimation of phosphorus, nitrogen and potassium in shoots and roots of tomato varieties as influenced by virus and nematode infections singly or in different combinations was investigated. The roots in nematode affected as well as in nematode virus combined treatments showed a higher percentage of total N, P and K as compared to shoots. The N, P, K percentage of shoot was higher in cases of healthy plants i.e., virus alone (V) and virus preceding nematode inoculation (V+n) treatments while just the reverse was observed in both, simultaneous inoculated (N+V) and the treatment where nematode preceded virus inoculation (N+v). In the roots of N+V and N+v treatments there was more accumulation of N, P and K.
