Abstract
Mefluidide {N-[2,4-dimethyl-5-[[(trifluoromethyl) sulfonyl] amino] phenyl] -acetamide}, a chemical with plant growth regulator properties, was applied to the foliage of potatoes (Solanum tuberosum L.) in field experiments to determine its effects on tuber development, maturity, and storage of the cultivars Russet Burbank and Norland. The rate of sucrose loss before harvest was reduced in mefluidide-treated plants. Total and marketable yields generally were lower in treated plants. Specific gravity tended to increase in Russet Burbank with application rates up to 1.0 kg ai/ha mefluidide. Preharvest treatments of mefluidide resulted in an increase in periderm thickness and russeting. However, weight loss during storage was greater in tubers from treated plants. Less sprouting occurred in storage in tubers from mefluidide-treated plants. Mefluidide resulted in a lower anthocyanin content and consequently an undesirable color change in Norland tubers.
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