Effect of glycyrrhiza [glycyrrhiza glabra] and henna [lawsonia inermis] plant wastes on controlling the root-Knot nematode, meloidogyne incognita on eggplant [solanum melongena]

Dry powdered root of glycyrrhiza and henna leaf powder were applied at the rates of 0.1, 1 and 10 g/pot for controlling Meloidogyne incognita on eggplant cv. Pusa Purple Long under greenhouse conditions. The higher rates [1 and 10 g] of glycyrrhiza did not decrease the number of galls and eggmasses, and plant growth parameters increased over those of the check. In contrast, increasing rates of henna powder reduced the numbers of galls and eggmasses in an increasing manner. Meanwhile, plant growth parameters insignificantly decreased in comparison with the check. Lower C/N ratio appeared to affect microbial activity resulting in lowering nematode population

Vertical and horizontal distributions of plant - parasitic nematodes associated with banana CV. Williams under flood irrigation regime

Under flood irrigation system, the vertical and horizontal distributions of plant-parasitic nematodes associated with soil and roots of banana cv. Williams were investigated. The sampling data generally indicated that the highest population density of parasitic nematodes viz. Criconemoides spp., Helicotylenchus exallus, Hoplolaimus spp. and Meloidogyne incognita were concentrated at soil depth layers of 0-15 cm, and 16-30 cm at the horizontal distance of just beneath the plant base [zero cm] and 40 cm from the banana pseudostem base which is correlated with the growth and distribution of the feeder roots of banana. These sites should be considered as the best sampling points for such coin habiting nematodes

Histopathological changes induced by either Root - Knot or spiral nematedes on banana roots

Cross and longitudinal sections in roots of banana cv. Williams infected by either Meloidogyne incognita or Helicotylenchus dihystera showed that the histological alterations induced in roots infected with M. incognita were displayed by the giant cell formation in both cortical and stelar regions. The giant cells were, always, in clusters each containing 3-6 cells. Roots infected with H. dihystera showed small brown lesions around the penetratedsites in the cortical layer causing considerable cell wall damage. The walls of the invaded cells by the nematodes were heavily stained with safranine indicating the presence of lignin, while healthy cell walls were lightly stained