Influence of soil types on the morphometrics of Tylenchulus semipenetrans and growth of Citrus paradisi Das T.K.*, Mukhopadhyaya M.C. Nematology Laboratory, Department of Zoology, University of Burdwan, Burdwan-713 104, West Bengal, India. * Present address: Department of Zoology, K.C. College, Hetampur-731124, Birbhum, West Bengal. Abstract Tylenchulus semipenetrans was cultured on Citrus paradisi in five different soil types for twelve months at the end of which nematodes were measured to study the influence of soil types on the degree of varIation in taxonomic characters. Shoot and root weights of the host species and nematode population were also estimated. Significant differenceswere observed in the morphometric characters of the nematode as well as in plant yields. Body length and width, stylet and neck lengths, width of the median bulb, shoot and root weights and population of T. semipenetranswere maximum in alluvial and minimum in sandy and red gravelly soil; laterite and clay behaving as intermediates. Top Key words Tylenchulus semipenetrans, Citrus paradisi, soil type, morphometries, multiplication. Top |