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acre acreage amount antibiotics application areas beans better breeders breeding Canada carrots chemical chips cluster color consumers cost cucumbers dieldrin disease downy mildew early effective Experiment Station F1 hybrid factors farm farmers fertilizer field flower fresh fruit fungicides Fusarium wilt glasshouse green greenhouse growing grown growth harvest head lettuce heptachlor herbicide hybrid important inches increase infected insecticides irrigation land late blight leaf leaf mold lettuce light lindane methods Michigan million bushels mosaic virus muck National Vegetable Week nitrogen onions organic packaging parathion peas percent period plants plastic potatoes pounds problems processing processors production resistance retail season seed treatments seedlings soil tests specific gravity spray storage streptomycin supply sweet corn temperature tion tobacco mosaic tobacco mosaic virus tomatoes tubers United varieties vegetable crops Vegetable Growers Association VGAA weed wilt yields