Graduate Thesis Or Dissertation
 

Factors influencing wild oat control with N-benzoyl-N-(3,4-dichlorophenyl) alanine (SD 30053)

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  • Studies were conducted in 1969 and 1970 to evaluate the effectiveness of an experimental herbicide, SD 30053 (alanine, N-benzoyl-N-(3, 4-dichlorophenyl)-, ethyl ester), for wild oat (Avena fatua L.) control in winter cereals. The 1969 field studies showed that postemergence applications of SD 30053 were effective in controlling wild oats. Wild oat control and grain yields were consistently better when SD 30053 was applied to wild oats when one to three stem nodes were visible. The application of 1 lb a.i./A¹ of SD 30053 to wild oats at the third node stage of growth gave similar results as 2 lb a.i./A applied to wild oats with one stem node visible or 4 lb a.i./A applied to wild oats which had 1-4 tillers formed, The grain yields from the above treatments were all significantly higher than the weedy check. The tank-mixing of SD 30053 with the dimethylamine salt of 2, 4-D reduced the effectiveness of SD 30053 in controlling wild oats. Nugaines winter wheat was quite tolerant to all SD 30053 applications while Wade fall barley was not sufficiently tolerant. The 1970 wild oat control results were similar to those obtained in 1969. When applied alone, SD 30053 was more effective at lower rates in controlling wild oats in the one- to 3-stem node growth stage than at earlier growth stages. On these later dates of application, only 1.0 to 1.5 lb ai /A of SD 30053 were required to give satisfactory wild oat control. When applied to wild oats which were beginning to tiller, 3.0 lb a.i./A of SD 30053 gave only fair wild oat control. However, the grain yields from these early applications were comparable or higher (depending upon location) than the later applications even though wild oat control was much poorer on the early application date. The delay in application caused a yield reduction from prolonged wild oat competition. The addition of a non-phytotoxic oil to SD 30053 definitely increased its herbicidal activity at lower rates and on earlier dates of application. Growth chamber studies in 1970 showed that SD 30053 was much more effective when applied alone to wild oats which had not been previously sprayed with the dimethylamine salt of 2, 4-D. ¹a.i. refers to active ingredient
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