Graduate Thesis Or Dissertation
 

Effect of timing and rate of metribuzin on wheat and barley cultivars and on Italian ryegrass

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  • A field study was conducted in 1973 and 1974 to determine optimum timing of metribuzin (4-amino-6-tert-butyl-3(methylthio) as - tria.zine-5(4H)one) on winter wheat (Triticum aestivum L. 'Hyslop') for control of Italian ryegrass (Lolium multiflorum Lam. ). Herbicide treatments were applied at 5 different stages of growth of winter wheat. Metribuzin at 0.56 kg/ha applied in December at the three to four tiller stage gave the best combination of high wheat yields and excellent ryegrass control. Preemergence and early postemergence treatments caused more wheat injury than later applidations. Poor ryegrass control was obtained from April treatments. The objective of the greenhouse experiments was to compare the responses of wheat and barley cultivars to metribuzin. Experiments were conducted either in the greenhouse or in growth chambers. Wheat cultivars were Hyslop, McDermid, Wanser, Paha, and Yamhill. Kamiak and Hudson were the barley cultivars. Metribuzin was applied at the two-leaf stage at rates ranging from 0.11 kg/ha to 1.68 kg /ha. Within barley cultivars, Kamiak tended to be more tolerant to metribuzin than Hudson. The relative sensitivity of the five wheat cultivars varied between experiments but three of the cultivars, Paha, Wanser, and Yamhill tended to be less susceptible than Hyslop and McDermid. Under the conditions of higher light intensity and higher temperature, barley cultivars were found to be significantly less susceptible to metribuzin injury than wheat cultivars.
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