These flies will lay their eggs on the underside of the leaf and when the larvae hatch they will begin to feed. Plants in the spinach family, like Swiss chard and beets, are also favorites, but leafminers will also feast on cucumber, celery, eggplant, lettuce, pea, potato, and tomato leaves, Yes, that's pretty much everything in the vegetable garden. The key to getting rid of a leaf miner infestation is to prevent it before it starts, but gardening doesn’t always work that way. Leaf miners are occasionally a problem. Pea leafminer (Liriomyza huidobrensis) ... Larval feeding results in slender, winding trails on the leaves, which form large, white blotches when mining becomes severe. Spinach, Swiss chard, and other greens Description. Another one is the vegetable leafminer, this leafminer feeds on the bean, tomato, squash, potato, watermelon, cucumber, eggplant, pepper, pea, beet and many others like lettuce. ... Answer: I wouldn't eat the leaves of Swiss chard with Cercospora. Adults can make as many as 100 feeding punctures on a single leaf. The beet leaf miner has two or three generations between April and September. The spinach leaf miners feed on tomato, cucumber, celery, spinach, and swiss chard. Spinach and Swiss chard leafminer flies are 1/2 inch long and gray with black bristles. One larva may feed on more than one leaf. If these insects do damage plants, it affects only appearance, not yield. Swiss chard is relatively free of pests. Kicking a Leaf Miner Infestation. These are larvae of a small fly called beet/spinach leaf miner. Instead, if you find yourself with leaf miners invading your garden, opt for natural methods such as introducing beneficial … Leafminer larvae are tiny, and somewhat flattened to fit inside a leaf. And, they’re tough to remedy. This leaf miner lay eggs on the underside of the leaves side by side singly or in batches up to five. The damaged leaves are unmarketable. They will even chew their way … The females, which resemble small house flies, lay small batches of eggs on the foliage of beetroot, spinach beet and Swiss chard. Two fungal diseases sometimes occur. As the larvae feed, they eat the green tissue inside the leaf, leaving a thin, winding trail covered by a papery sheath. If you’re growing chard, spinach or other leafy greens in Seattle this month, you may be seeing widening lines of twirling damage running through your crops. Around 5% of these punctures may contain actively feeding larvae. Includes. Leaf Miners: Leaf miners eat the tissue of the leaf. The trail may contain small brownish black pellets of insect excrement, and if you look closely you may be able to see larvae. Chard, Swiss-Leafminer. Eucalyptus oil organic pesticides. Prevent damage by covering young plants with a floating row cover in spring when leaf miner flies are most active. Fall and Spring seem to be the season for the leafminer to go crazy on our food crops.