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acreage Agricultural Experiment Station anthracnose boilers caused chopped hay condenser cover Crop rotation cultivated culture cutworms damage deep plowing dieldrin disease distillation tubs ditches drained early equipment extension pipe farm farmers fected fertilizer Figure first-year flavor flea beetle frequently fungus furrow grow growers grown growth harrowed harvest Heavily infected plants herb inches Indiana insecticide irrigated leaf leafhoppers leopard spot loopers lower leaves meadow Mentha Michigan mint-producing areas mints muck lands muck soils nematode OIL RECEIVER oil yield older operation Oregon outlet Pacific Northwest peppermint and spearmint Peppermint Oil permint plant an acre planting stock production rates of application reduced roots rust on peppermint sandy loam soils Scotch spearmint season sickle bar spearmint oils species spray spread spring Stationary tubs steam and oil stem stolons for planting tion usually verticillium wilt Washington weather weed control wild mints Willamette Willamette River Willamette Valley worm yield of oil young plants