Submitted by suseela
Nematode pests in turmeric
Among the many species of plant parasitic nematodes reported on turmeric Meloidogyne spp. (root knot nematode), Radopholus similis (burrowing nematode) and Pratylenchus spp. (root lesion nematode) are of economic importance. Pratylenchus spp. is of common occurrence in Andhra Pradesh.
SymptomsThe symptoms of M.incognita infestation on turmeric include marginal and tip necrosis, yellowing, reduced tillering, culminating in stunted growth, coupled with root galling and rotting. R. similis infected roots of turmeric become rotten and these roots are found to retain only epidermis and are devoid of the cortex and stellar portions. The infested rhizomes are yolk yellow in colour and have shallow water soaked brownish areas on the surface. The infested plants show a tendency to ageing and dry faster than healthy ones resulting in a poor crop stand.
ManagementUse healthy, nematode-free planting material. Increasing the organic content of the soil also checks the multiplication of nematodes. Pochonia chlamydosporia can be applied to the beds at the time of sowing @ 20 g/bed (at 106 cfu/g) for management of nematode problems.