It has long been recognized that chemotaxis is the primary means by which nematodes locate host plants. Nonetheless, chemotaxis has received scant attention. We show that chemotaxis is predicted to take nematodes to a source of a chemo-attractant via the shortest possible routes through the labyrinth of air-filled or water-filled channels within a soil through which the attractant diffuses. The...

Nematodes comprise a large phylum of animals that includes plant and animal parasites as well as many free-living species (Maggenti, 1981). Plant parasitic nematodes are obligate parasites, obtaining nutrition only from the cytoplasm of living plant cells. These tiny roundworms (generally 4 mm long and barely visible to the human eye) damage food and fiber crops throughout the world and cause b...

Abstract Root-knot nematodes ( Meloidogyne spp.) have been reported to be responsible for large economic losses of agricultural crops due their wide host range and variety suitable climates. The control measures these parasitic depend upon synthetic nematicides a small number bio-based products. Chemical are eliciting adverse effects on the environment human health. In present study, an alterna...

Root-knot nematode disease occurs frequently due to continuous monocropping and excessive water nitrogen input. The degree gall index are often used evaluate the damage of root-knot disease. However, weak correlation between these two indicators tobacco leaf dry weight has been reported. objective this study was verify whether use density (RKD)—the number per unit root or volume—as a new indica...