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acre Agriculture American foulbrood annual areas average beekeepers bees bushels calcium arsenate cent codling moth commercial committee cooperation corms crop crop rotation disease Edgecombe Experiment Station farm farmers federal feet fertilizer Fitch flowers forest fruits and vegetables Garden Clubs grade growing harvest honey Horticultural Horticultural Society inches increase Indianola infestation insects Iowa apples Iowa Florists Iowa Fruit Growers Iowa State College Iowa State Horticultural Jonathan land lead arsenate lime manure Mason City mealy bug meeting melons method Mitchellville Moines moisture muck Muscatine onions orchard pack peat Pellett plants plots pounds President Clark President Hass production Prof pruning R. S. Herrick resistant root system rotation scab season Secretary secretary-treasurer seed soil spray spring sweet potatoes temperature tests thin wood tile tion tomatoes trees varieties vegetable growers Virginia Crab weeds Wolford yields