Insects and Mites
Blotch Leafminer Injury on Garden Mum
Leafmining is formed by insects that produce“mines” in leaves by feeding. Different species of leafminers feed upon different plants. Leafminers may be either a wasp, fly, moth or beetle species.
Usually the immature, or larval stage, of insects produces the “mines”. Most leafminers drop to the ground to pupate. Leafmining insects are typically classified as “serpentine leafminers” or “blotch leafminers”. Serpentine leafminers typically form leaf mines in a zigzag pattern. Blotch leafminers like in this photo generally make large mines without a particular pattern. Blotchminers may be confused with leaf spot diseases.
For more information on management see: New England Greenhouse Pest Management Guide
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