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Agronomy Journal Abstract -

Differential Responses of Sorghum Varieties to Picloram1


This article in AJ

  1. Vol. 62 No. 6, p. 775-777
    Received: Apr 6, 1970

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  1. C. J. Scifres and
  2. R. W. Bovey2



‘Pioneer 820’ seedlings were the most tolerant of seven sorghum (Sorghum bicolor (L.) Moench.) varieties to pre- or postemergence irrigation and to postemergence sprays with various concentrations of 4-amino-3,5,6-trichloropicolinic acid (picloram). Response to the herbiside varied widely among varieties. Significant increases in dry weight of Pioneer 820, ‘RS-625’, and ‘PAG-665’ occurred when treated preemergence with irrigation water containing 0.5, 1, and 2 ppm of picloram whereas ‘GA-615’, ‘RS-671’, ‘Tophand’, and ‘RS-626’ were reduced in growth by these concentrations. Dry weights of Pioneer 820 and RS-625 were increased by irrigation water containing .001 to .005 ppm of picloram applied postemergence or when treated with sprays containing 0.035 to 0.7 kg/ha. Tophand was the least tolerant of picloram regardless of method of application. Varieties intermediate in susceptibility to picloram such as GA-615, RS-671, and RS-626 tolerated the low concentrations used with the various treatment methods, but the higher concentrations often reduced seedling growth.

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