Herbicide Resistant Weeds

Identification of graminicide-resistant johnsongrass (Sorghum halepense).

Smeda, R. J., C. E. Snipes, and W. L. Barrentine. 1997. Identification of graminicide-resistant johnsongrass (Sorghum halepense). Weed Science. 45: 132-137.

Resistance to fluazifop-P and quizalofop-P (aryloxyphenoxypropionates), and sethoxydim (cyclohexanedione) was identified in 2 populations of johnsongrass in both field (Washington County, MS) and greenhouse studies. The cropping history (1983-91) of the sites indicated 1 or more annual applications of a graminicide (primarily fluazifop-P) since the early 1980s. Under field conditions, control of resistant seedling and rhizome johnsongrass (R91F) with fluazifop-P, quizalofop-P, fenoxaprop-ethyl and sethoxydim was <35%. Clethodim provided up to 80% control of R91F. Under greenhouse conditions, ratios (R/S) of the I50 values (amount of herbicide required to inhibit plant growth by 50%) of resistant (2 sites: R91F and R91S) to susceptible (S91H) seedling (20-30 cm height) plants were >388 (fluazifop-P), >15 (quizalofop-P) and from 2.3 (R91S) to 3.4 (R91F) (both sethoxydim). For rhizome (30-45 cm height) plants, the R/S ratios were >388 (fluazifop-P), >16 (quizalofop-P) and 2.8 (R91S) to 8.5 (R91F) (both sethoxydim). Labelled rates (in kg ai ha-1) of fluazifop-P (0.10 and 0.21), quizalofop-P (0.039 and 0.08), and sethoxydim (0.21 and 0.21) were applied on seedling and rhizome plants, respectively, and resulted in little or no control of resistant johnsongrass. Greenhouse studies indicated registered rates of clethodim (0.10 and 0.14 kg for seedling and rhizome plants, respectively) effectively controlled the resistant populations, but tolerance was measured for both seedling and rhizome plants at sublethal doses (down to 0.007 and 0.009 kg, respectively), with I50 ratios ranging from 1.5 (R91S) to 2.1 (R91F) for seedling plants and 4.5 (R91S) to 4.8 (R91F) for rhizome plants. Control of resistant seedling and rhizome johnsongrass under field conditions was adequate with glyphosate at 0.84, glufosinate at 0.84 and sulfosate at 0.84 kg, indicating no cross-resistance.