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Control of italian rye grass and wild oats in winter wheat with hoe 23408

Control of italian rye grass and wild oats in winter wheat with hoe 23408

Agronomy Journal 69(6): 911-913

Italian ryegrass (Lolium multiflorum Lam.) and wild oats (Avena fatua L.) are widespread and competitive weeds in winter grain fields of western Oregon and Washington [USA]. Field studies were conducted at 12 locations in 1974-75 and 1975-76 to evaluate the effectiveness and consistency of weed control with HOE 23408 {methyl 2-[4-(2,4-dichlorophenoxy) phenoxy] propanoate} in winter wheat (Triticum aestivum L.) and to measure the influence of removing ryegrass and wild oats on wheat grain yields. HOE 23408 was applied preemergence, early postemergence (2-3 leaf stage) and late postemergence (tillering stage) at rates of 0.84-2.24 kg/ha. When applied preemergence, HOE 23408 gave adequate control of ryegrass when the seedbed was relatively free of clods and plant residues, but wild oat control was erratic. Nearly complete control of both species was obtained from all postemergence treatments at rates as low as 0.84 kg/ha. Increases in wheat grain yield were often dramatic; in 1 case the increase over the untreated control was 6000 kg/ha from treatment at 1.12 kg/ha applied early postemergence. Average yields from this treatment exceeded yields from plots treated with diuron [3-(3,4-dichlorophenyl)-1,1-dimethylurea], barban (4-chloro-2-butynyl m-chlorocarbanilate), and triallate [S-(2,3,3-trichloroallyl)diisopropylthiocarbamate] by 2170, 1280 and 1580 kg/ha, respectively. HOE 23408 has considerable potential for control of ryegrass and wild oats; large increases in yield of wheat gran can be expected when severe infestations of these weeds are controlled.

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Accession: 005050219

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