HERBICIDAL EFFECTS OF TCA AND DALAPON ON FLAX

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Abstract
The herbicidal effects of TCA (trichloroacetic acid) and dalapon (2,2-dichloropropionic acid) on three flax varieties (Marine, Redwood and Raja) were studied in 1958 and 1959. Morphological deformities, seed yield, oil content, iodine values and seed viability were used to measure the tolerance of flax to these herbicides.In 1958, TCA and dalapon applied at the recommended rates of 4 pounds and 1 pound per acre, respectively, did not result in appreciable injury to flax plants. In 1959, comparable treatments reduced yields significantly and in several instances lowered the oil content and iodine values. TCA applied at 8 pounds per acre and dalapon applied at 3 pounds per acre resulted in considerable crop injury in both years. Stage of flax growth at time of treatment did not appear to influence the degree of injury. No consistent differences in the tolerance of flax varieties were apparent with respect to the factors studied. TCA treatments were, in general, less injurious than dalapon treatments.