Maggots commonly hatch when spring weather is wet and cool. Female flies lay cracks in the soil. When the eggs hatch, the maggots emerge and attack the roots of vegetables, including radishes, broccoli, cabbage, cauliflower, turnips and white onions.
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Megan Smith has been a freelance writer and editor since 2006. She writes about health, fitness, travel, beauty and grooming topics for various print and Internet publications. Smith earned a Bachelor of Fine Arts in writing from New York University.