Infestation of Root-Knot Nematode, Meloidogyne graminicola in Wheat
A survey was conducted for analysis of losses by rice root-knot nematode (Meloidogyne graminicola) in wheat were assess under 30 plots during 2004–05 and 2005–06 of Agriculture Research Farm, Institute of Agricultural Sciences, Banaras Hindu Universtiy, Varanasi. On the basis of observations, it was found that out of 30, 18 wheat plots recorded root-knot infection, during 2004–05, while during 2005–06, out of 30, only 6 wheat plots recorded root-knot infection. Thus only fields recorded 20% infection during 2005–06. The field infection of wheat by M. graminicola of seedling stage reduced height of plants by 50% in severely infected fields during 2004–2005. However, during 2005–2006 reduction in height of the plants was much less due to mild infection. During 2004–05, particularly in later sown fields, the number and length of internodes were greatly reduced. The flag leaves of severely infected plants at maturity stage extended beyond the ear head whereas in healthy plants flag leaves and ear head terminated at equal level. In general, the number of grains per ear head was reduced in the infected plants which were related to number of galls per plant.
Meloidogyne graminicola, rice root-knot nematode, yield losses, wheat, Phalaris minor, Cyperus rotundus, Cynodon dactylon.