RESPONSE OF FOUR POTATO CULTIVARS TO METRIBUZIN TIME AND RATE OF APPLICATION

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Abstract
Over a 4-yr period (1974–1977) the effect of metribuzin at three rates and times of application was evaluated on four potato (Solanum tuberosum L.) cultivars commonly grown on Prince Edward Island. Metribuzin applied preemergence and early postemergence had no adverse effect on marketable and total yields of Irish Cobbler, Netted Gem, Kennebec, and Sebago cultivars. Delaying metribuzin application until late postemergence resulted in significantly reduced marketable yields of Irish Cobbler and Sebago but not Netted Gem and Kennebec when compared with preemergence and early postemergence treatment. Total yields with late postemergence treatment were significantly less than those with the preemergence treatment for all four cultivars and significantly less than early postemergence treatment with Irish Cobbler and Sebago.

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