Diversity of nematode populations on cruciferous and solanaceous crops in Bagmati province of Nepal

A total of 211 soil samples were collected in different crop fields from 10 districts. Out samples, 137 diagnosed for plant parasitic nematodes. The the cruciferous and solanaceous crops. All together twelve nematodes identified. identified genera are Meloidogyne, Helicotylenchus, Pratylenchus, Tylenchus, Tylenchorhynchus, Hoplolaimus, Belonolaimus, Criconemoides, Aphelenchoides, Hirschmanniella, Longidorus Rotylenchulus. They found either single or more than one genus a sample. It means they existed both combine with two same place root zone. population some nematode was recorded above threshold level below to cause significant yield loss In potato, Pratylenchus Tylenchus equal 2 per gram soil. Similarly, tomato, Tylenchorhynchus level. Likewise, distribution cabbage, cauliflower, chilly, capsicum, board leaf mustard, carrot radish also had reduce crops yield. Hence, lower may not show any symptom caused by alone so effects easily be overlooked, but become problem when surpasses damage threshold; at that point due pathogen is measurable need manage them.