SUSTABILITY OF FIVE PREEMERGENCE HERBICIDES FOR CASSAVA(MANIHOT ESCULENTA CRANZ)

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Parent Category: 1982

LO NYOK PIANG

SUMMARY

Two experiments were conducted to determine the suitability of five preemergence herbicides for cassava. The first experiment showed that alachlor [2-chloro-2', 6'-diethyl N-(methoxymethyl)- acetanilide], fluometuron [1, 1-dimethyl-3-(a, a, a-trifluro-m-toly) urea], and oryzalin (3. 5-dinitro-N4, N4-dipropylsulfanilamide) were safe to cassava at 1.5 kg/ha and produced a satisfactory weed control Applied at 1.5 kg/ha, diuron [3-(3, 4-dichlorophenyl)-1, 1-dimethylurea] induced some phototoxicityl tebuthiuron [N (5-(1, 1-dimethyl-ethyl)-1, 3, 4-thiadiazol-2-yl)-N, N-dimethylureal gave a long and excellent weed control but induced severe phytotoxicity. The second experiment confirmed that alachlor, fluometuron and oryzalin were selective and had a wide margin of safety to cassava. Diuron had been found to be partially selective and may not be safe if applied more than 1.5 kg/ha. However, it may be used in combination with alachlor at a reduced rate. It is concluded that suitable herbicides fbr cassava were alachlor, fluometuron and oryzalin

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