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I live in northeast Pa.I live in northeast Pa. Started my first garden ( 12.raised beds 4' x 12') last year. Did well with everything except the red beets, spinach and Swiss chard leaves hit hard with leaf miners. How can I prevent this!

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?