Chemical control of ufra disease in transplanted rice [Bangladesh].
1985
Rahman M.L. | Miah S.A.
Four nematicides, common salt, and zinc sulfate were tested for control of ufra caused by the stem nematode Ditylenchus angustus. At harvest, recovery was 64% with carbofuran, 69% with fenamiphos, and 73% with disulfoton. Plants treated with these nematicides yielded 14, 21, and 20 g/pot. There was no yield from other treatments. Secondary tillers of the three successful treatments were not ufra-infected. All tillers died in the other treatments. A trial was conducted in an ufra-infested transplanted aman field to identify the proper carbofuran dosage to be applied after plants show ufra symptoms. Carbofuran at 0.5, 1.0, or 1.5 kg ai/ha was incorporated in soils in 2-3 cm standing water at 1-mo intervals at tillering and late tillering. Carbofuran at 1.5 kg ai/ha gave best results. In most cases, ufra infestation was less at harvest than at booting stage. The experiments showed that nematicides can control ufra in transplanted rice, even after symptoms have developed.
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