University of Maryland Extension

insect problems

Perfect Weather for Seed Maggots and Other Soil Pests

Figs. 1, 2 and 3. Swollen stem of cucurbit plant with collapsed rotting roots and seed maggot damage to bean. When stem is cut open maggots can be seen.
The weather we are having is perfect for several soil pests in growers’ vegetable fields. This sudden cool, wet spring is good weather for pests of seeds, transplants, and bulbs—like the seed corn maggot Delia platura (SCM) and other seed maggots such as Cabbage maggot Delia radicum (it prefers to...

Mites (Two Types) Found in Strawberries

While visiting some strawberry fields over the last few weeks, I ran into a few areas that had two spotted spider mite (TSSM) feeding. These were mostly in fields that had been using row cover. Spider mites Tetranychus urticae are well adapted to high-temperatures and can complete their life cycle...

Allium (Onion) Leafminer

The allium leafminer Phytomyza gymnostoma (also known as the onion leafminer) has recently been detected and confirmed from infested leeks in Lancaster County, PA. This is the first confirmed infestation in the Western Hemisphere. Host Plants and Damage Symptoms The allium leafminer has been...
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