Frequency Occurrence and Population Density of Plant-Parasitic Nematodes Associated with Solanaceous Plantations Grown in Dakahlia Governorate

Survey of plants parasitic nematodes gives information about parasitic nematodes distribution and delivers supplementary information to agronomists about phyto-nematodes importance. A survey of four solanaceous plants i.e., potato, tomato, pepper, and eggplant grown within three counties in Dakahlia governorate i.e., El- Sinbillawain, Mansoura and Aga revealed the presence of 10 nematode genera i.e., Dorylaimus, Helicotylenchus, Hoplolaimus, Meloidogyne, Pratylenchus, Rotylenchulus, Trichodorus, Tylenchorhynchus , Tylenchus and Xiphinema . The root knot nematode, Meloidogyne spp. appeared to be the key pest as its documented 108 times with total percent incidence of 72.0 %, whereas, the nematode genera, Rotylenchulus and Trichodorus exhibited modest spreading as they occurred at rates of 55 and 50 times with percent incidence of 36.6 and 33.3%, respectively. On the other hand, Helicotylenchus and Xiphinema had the lowermost values of spreading as they occurred at rate of 13 times with percent incidence of 8.6 % for each one. However, Meloidogyne spp. showed greater rate of occurrence in clayey soil texture at El- Sinbillawain county with value of occurrence 75.8%. Potato and eggplants encountered highest nematode genera numbers with equal number (9), followed by tomato (8), while pepper have the lowest number (7) respectively.