Neck rot infection of rice: varietal resistance, panicle phenology and yield reduction [Malaysia; fungus]
1983
Supaad Mohamad Amin (Institut Penyelidikan dan Kemajuan Pertanian, Malaysia, Bumbong Lima)
Three rice varieties were inoculated with Pyricularia oryzae when 75 percent of the crops had headed. Disease severity was monitored from the time of inoculation until harvest, after which the grain yield was separately recorded for each variety. Kadaria was found to be resistant to neck rot. However, 75 percent of the panicles in Jaya and Sekencang were infected. In both varieties, it was observed that more than 45 percent of the panicles which was exserted after the time of inoculation had secondary infections. Infection of neck node reduces grain yield. As much as 41 percent and 32 precent loss in yield was observed in Jaya and Sekencang respectively. Detailed observation on Jaya showed that early infection resulted in greater loss in yield. The grain yield of the lower zone of the panicle was most affected. Laboratory experiments indicated that panicles become less susceptible to infection as they mature
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