Weeds - 70



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Research in the last two years has made rapid progress against weeds -- one of the most costly items in growing rice. The project includes both liquid and granular materials distributed by air. A prime factor is improved techniques with materials currently available.

Since propanil is not generally allowed north of Interstate 80 in California, growers in 1971 will fight rice weeds primarily with molinate (Ordram«) and MCPA. Be sure to follow manufacturer's directions and local regulations exactly!

TOK (nitrofen) is a new commercial product offered to growers on an experimental commercial basis. It appeared effective in tests at both Biggs and Davis. Follow manufacturer's treatment time and seeding-delay time precisely.

IMC-3950 is a Japanese rice herbicide that appears very promising under California conditions. In Japan it is known as "Saturn." In 1971 it will be studied by researchers in the field and in some small experimental commercial tests. It performs similarly to molinate on watergrass but is more effective in controlling sedges and broadleaf weeds. Incorporation is unnecessary if applied preflood. Tests will also try it applied 7 to 14 days after water seeding.

Studies in 1970 confirmed that MCPA for control of broadleafs should not go on until jointing or stem elongation (50 to 62 days after planting) are well under way. Then the rice is most resistant to it.

Many new compounds are being screened to develop more economical and safer ways of controlling all types of weeds of California rice fields. Accent is on locating compounds that in a single application will kill all weeds and not injure rice. Chemical companies are providing materials and some financial support.


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