Leaf symptoms of adult allium leafminer activity were observed on scallion and wild garlic in Lancaster, York and Perry counties on March 17 and 18. When they hatch, the tiny larva feed on the leaves, working their way toward the base of the plant. The Allium leafminer (ALM) is an invasive insect that was first reported in NYS in spring 2017. Allium leaf miner is an insect pest similar to leek moth, as it causes a substantial amount of damage to Allium crops at the larval stage. Controlling Leafminers . Insecticides are rarely recommended to control leafminers. ALM (Figure 1, above) has two generations per year. Allium roylei is a non-bulbing wild relative of common onion (Allium cepa) with several desirable traits, including resistance to Botrytis leaf blight (BLB) and downy mildew. At the 2019 International Allium Conference, Dr. Brian Nault of Cornell University charted a potential path for the pest to spread throughout the country. “I don’t think that Allium leafminer is likely to move west on its own. and allium leaf miner pests. Larvae mine leaves, and move towards and into bulbs and leaf sheathes where they pupate. It provides readers with information on upcoming meetings, pesticide updates, pest management strategies, cultural practices, marketing ideas and research results from Cornell University and Cornell Cooperative Extension. As a review, allium leafminer has spread from Pennsylvania into New Jersey, New York, and Maryland. Allium leafminer, Phytomyza gymnostoma Loew, is the newest invasive pest of allium crops in North America. The larval stage is the most damaging to allium plants, when the larvae move toward the center of their host plants where young leaves are formed to feed. At present, the main area of infestation in New Jersey appears to be in the northern counties. This is about one month earlier than we normally see the spring flight of this potentially devastating pest of all allium crops — … ALM (Figure 1) has two generations per year. Photo courtesy Ethan Grundberg, Cornell Cooperative Extension. Asparagus. Allium Leaf Miner; Garlic Bloat Nematode; White Rot of Alliums; Organic Resources for Vegetables; CCE Commercial Vegetable Programs. Allium Leaf Miner in Home and Public Gardens (2 page PDF) From Cornell Cooperative Extension Beneficial Insects and Pollinators Beneficial Insects-Nature's Pest Control (3 page PDF) From CCE of Oneida County) It is currently found in several counties in New Jersey and Pennsylvania. The allium leafminer has been reported to infest species in the genus Allium. During this meeting, farmers joined Howard Prussack of High Meadows Farm, University of Vermont Agricultural Engineer Chris Callahan and Cornell Cooperative Extension Vegetable Specialist Crystal Stewart for a field walk discussing garlic and onion production and postharvest handling. Niching Down to Become Profitable with Ray Tyler of Rose Creek … This is the first confirmed infestation in the Western Hemisphere. Allium Leaf Miner: A new invasive insect pest in the Northeast known as the Allium leafminer (ALM), Phytomyza gymnostoma Loew, damages crops in the Allium genus (e.g., onion, garlic, leek, scallions, shallots, and chives) and is considered a major economic threat to allium growers. Cornell Food Safety . Allium leaf miner adult – L. Barringer, Pennsylvania Department of Agriculture. Last summer we had a twilight meeting all about Alliums at High Meadows Farm on July 12th, 2018. 10:30-11:00- Emerging pest issues: leek moth and allium leaf miner. 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