Ten populations of Xiphinema americanum-group nematodes were reared from individual females to evaluate inter- and intraspecific variation under identical host and environmental conditions. Data indicated that morphometric variability of X. americanum was the result of genetic variation rather than phenotypic plasticity and that genetic heterogeneity was greater than previously thought. Morphom...

A survey of vineyards in western Oregon was conducted in 1994 and 1995 to determine the association of plant-parasitic nematodes with vine health. Seventy vineyards in four regions of western Oregon (16 to 21 vineyards per region) were sampled. The regions were the northern, middle, and southern Willamette Valley, and southern Oregon. Vineyards were selected and partitioned into blocks by varie...

Up until now, there have been few studies of the helminth fauna of Brazilian populations of Pogonias cromis. In North America, P. cromis is known to be a definitive host of Cotylogaster basiri, although there have been no reports of any species of Cotylogaster infecting fish in Brazil. During necropsies of marine fish obtained from professional fisherman in the state of Rio Grande do Sul, Brazi...

Plant-parasitic nematodes cause 14 % of annual losses in different crops the world and there are more than 35 genera phytoparasitic associated with rhizosphere papaya crop (Carica spp.), being most important root-knot nematode (Meloidogyne spp). The present study aimed to carry out morphological identification cultivation Andean pubescens), Sandia district, Puno, Perú. One-hundred fifty-five so...

Grape plants (Vitis vinifera L.), like other major horticultural crops, suffer from attacks by plant pathogenic nematodes. These parasites are a serious burden for viticulturists all over the world and lead to reduced vine vigour crop yield. The nematode infesting grapevines include Meloidogyne spp., Pratylenchus Criconemella Tylenchulus Helicotylenchus Heterodera spp. etc. Besides these genera...