The concentration of carboxin was determined on individual seeds of seed lots of the bunt-susceptible spring wheat cultivar Laura obtained from different seed treatment operators, farmers, and the manufacturer. These seeds were subsequently infested with a composite of teliospores of virulent races of Tilletia tritici and T. laevis and seeded in irrigated and dry 1989 and 1990. At mean bunt infection levels of 19.2 and 50.0%, which occurred in 1990, failure to achieve target rates of carboxin of 550-690 mg/kg in seed appeared to be the greatest cause of poor efficacy (...)
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D. A. Gaudet (1992) studied this question.
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