EFFECT OF VARYING DENSITIES OF SORGHUM CYST NEMATODE, HETERODERA SORGHI, ON PLANT GROWTH AND NEMATODE MULTIPLICATION ON SORGHUM
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Authors
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ARCHANA MITTAL AND S. C. DHAWAN
Division of Nematology, Indian Agricultural Research Institute
New Delhi 110 012
Abstract
Studies conducted on the effect of varying densities of Heterodera sorghi on sorghum revealed a negative correlation between nematode densities and plant growth characters. Fresh weights of shoot and root decreased significantly at the initial inoculum level of 8 larvae/cm- soil, whereas dry weights of shoot decreased significantly at the initial inoculum level of 4 larvae/ cm3 soil. A positive correlation was evinced between initial nematode densities and number of cysts formed and larval population in soil. On the contrary, cysts contents (eggs and larvae/cyst) showed a negative correlation with maximum being at the lowest level of nematode density (1 larva/ems soil) and minimum at the highest level (16 larvae/cm' soil). The threshold damaging level was found to be 8 larvae/cm- soil.
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