The experiments with black gram plants inoculated with Black gram leaf crinkle virus (BLCV)at 5-day interv- el from 5 to 50days of age showed that the plant susceptibility and the percentage of seed transmission of BLCV were reduced.as the age of the plants increased.The higher percentage of infection observed in young infected plants induced higher rate of seed transmission .The incubation of BLCV in black gram plants was positively correlated with the age of plants at the time of inoculation.but it showed a negative linear relationship with the percentage of seed transmission of BLCV.The necessary of protecting the plants at early stages of growth to avoid sead transmission of BLCV has been discussed.
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Tamil Nadu Agricultural University
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