Leafminers
(click image to enlarge) Symptoms:
• Green to white winding mines
• Mines expand and run together forming necrotic, sometimes blister-like areas
Epidemiology:
• Adult flies emerge from the soil from late April to mid-May
• Eggs are small (1 mm long), white, cigar-shaped and arranged in rows of 2-10 on the underside of the leaf
• Pale green maggots hatch in 3-10 days and tunnel into leaf tissue
• Fully grown larvae pupate in the soil and potentially overwinter
• Up to 3 generations per year
Description:
• Flies with clear wings, gray-greenish to gray-brown, hairy bodies, 7 mm long
Control:
• Destruct common lambsquarters and other alternate hosts
• Insecticidal seed treatments
• Foliar applied insecticides