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Influence of Dicamba on the Growth and Development of Grain Sorghum¹

Experiments were conducted in the field and greenhouse to determine the responses of grain sorghum to 3,6-dichloro-o-anisic acid (dicamba). Plants were treated on different segments of the plant and at different growth stages. The influence of dicamba on floral development was also studied. Treatment of 2- to 3-week-old plants delayed maturity and reduced sorghum height. Varietal differences in dicamba susceptibility occurred, with two of seven varieties not producing seed after treatment. Soil treatments caused more injury than foliar applications. Treatments when the plants were 40 days old reduced yield. Treatments after head emergence caused increased lodging and sometimes resulted in head damage at anthesis. When applied to the 12th leaf of flowering plants, radioactive dicamba was found to translocate readily and to accumulate in the floral organs. Treatment of A- and B-line sorghum indicated that dicamba did not affect pollen production or viability. However, the female flower organs were affected.

Key Words: Herbicide injury • Sorghum bicolor • A-line • B-line • Labeled C.

² Research assistant and Professors, respectively.

Received for publication November 3, 1969.