Some studies on the species of Criconematids (Nematoda: Tylenchida) from Hilly Districts of Nepal

A nematological survey was conducted in three hilly districts – Bhaktapur, Kavre and Dhading surrounding capital city of Nepal ranging the altitudes between 1340m to 1540m. Randomly collected soil samples from vegetable fields processed through Cobb’s sieving and decantation method yielded various tylenchid nematodes. Among six species of criconematid nematodes found associated with vegetable crops, four species viz. Hemicriconemoides mangiferae Siddiqi, 1961, Criconemoides brevistylus Singh and Khera, 1976, Discocriconemella retroversa Sauer and Winoto, 1975 and Hemicycliophora arenaria Raski, 1958 are described here with their morphometric data along with localities and host plants and illustrated with photomicrographs.