Vol. 10, Issue 4 (2021)

Author(s):
Silpi Patel and BK Dash

Abstract:
Investigation has been done on the relationships between the population density of Meloidogyne incognita and its effect on urd bean cv. T-9. Result of the pathogenicity test showed an initial inoculum level of 1000 J₂ of Meloidogyne incognita per kg soil was the damaging threshold level with which plant growth parameter was inversely proportional, except fresh and dry weight of root. With increasing inoculum densities reduction seen in the plant vegetative growth parameters and nematode population. An initial inoculum level of 100 nematodes per kg of pot soil caused significant reduction in plant growth parameters and proved to be pathogenic. Maximum galls per root system were recorded in 100 and 1000 J₂ per kg of soil, which suddenly decreases at 10000 inoculum level. Again the final nematode population increases with increase in inoculum levels but nematode multiplication rate was inversely proportional to the nematode inoculum level.