Actual Conditions on Paddy Fields Shown the Dwarfish Symptoms of Rice Plants, Caused by Benthiocarb Applications

TAKEICHI Yoshio, KOYAMA Yutaka

doi:10.3719/weed.24.247

The dwarfish symptoms in growing rice plants which had occurred at Chiba prefecture in 1978 were investigated. The results obtained were as follows. 1. The rice plants in question had following typical symptoms, that is, the half or 2/3 plant height compared with normal, dark green color of the leaves, irregular occurence of the tillers, small amount of the root-development, and brown color of the roots. 2. The occurence places shown such dwarf rice plants in paddy fields were classified as follows, that is, corner part appearance in a field, parallel appearance to levee, ridge-line appearance, spotty appearance, and whole hill appearance in a field. 3. In the fields shown such plants mentioned above, the herbicides contained benthiocarb were applied without fail, and their fields had had chiefly an application of fresh rice straw before the cultivation at last autumn or that spring. 4. The oxidation-reduction conditions in the soil in question showed a positive reduction condition, that is, it was about -60mV for pH 6.0 compared with about +10mV in the normal growth condition. 5. The discrimination in the soil texture shown the dwarfish symptoms was difficult owing to these plants being occurred in various soils, such as loam, coarse loam, sand, and others.

Actual Conditions on Paddy Fields Shown the Dwarfish Symptoms of Rice Plants, Caused by Benthiocarb Applications

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