Spinich Leafminer- Identification and Management

The adult fly appears in early to mid- May after overwintering in the soil as pupae. It is a about 5 mm long and are gray in color. The adults can be seen flying near the ground between the plants. The females deposit eggs singly or in rows of two to five side by side on the underside of the leaves. In as little as three days but more commonly in four to six days the tiny legless, white to yellowish maggots hatch from the eggs and work their way into the leaf tissue. The maggots feed between the upper and lower leaf surfaces of the host plants mining out the tissue in between. It is not unusual for several larvae to be in the same leaf. As the maggot grows and continues to feed, the mines, which are at first thread-like, become blotch-like and are easily seen on the infected leaves. The larvae are full-grown in 7 to 16 days when they drop to the ground and burrow a few inches into the soil to pupate. Two to four weeks later the adult flies emerge and will soon lay eggs for another generation. In New York you can expect three to four generations each year.
Management- a preventive spray schedule beginning when the spinach is two true leaves and repeated every 7 days. Remove wild hosts like lambsquarter, nightshades, chickweed, and plantain. Deep plowing in the spring can reduce the overwintering population by burying existing pupae. In smaller stands, infected leaves can be picked before the maggots drop to the ground. Removing and destroying these infected leaves can lessen the leafminer pressure
-Ray Range


Upcoming Events
2025 Berry Twilight Meetings

July 2, 2025 : Berry Twilight Meeting at Dressel Farms
New Paltz, NY
Join Heather Kase, CCE ENYCHP, and Anna Wallis, Cornell IPM, for seasonal updates on berry pest man-agement and IPM.

July 16, 2025 : Berry Twilight Meeting at Samascott Orchards
Kinderhook, NY
Join Heather Kase, CCE ENYCHP, and Anna Wallis, Cornell IPM, for seasonal updates on berry pest man-agement and IPM.

August 6, 2025 : Berry Twilight Meeting at Fishkill Farms
Hopewell Junction, NY
Join Heather Kase, CCE ENYCHP, and Anna Wallis, Cornell IPM, for seasonal updates on berry pest man-agement and IPM.
Vegetable Field Meetings with Dr. Steve Reiners

July 14, 2025 : Herkimer County - Ivan Martin's Farm
Herkimer, NY
Topics: Tomato Fertility and Mitigating Physiological Disorders; Pest Scouting, ID, and IPM Field Walk.

July 15, 2025 : Washington County - Hand Melon Farm
Greenwich, NY
Topics: Tomato Fertility and Mitigating Physiological Disorders, Tomato and Sweet Corn IPM; FSMA Water Assessments and Postharvest Sanitation

July 16, 2025 : Ulster County - Wallkill View Farm
New Paultz, NY
Topics: Tomato Fertility and Mitigating Physiological Disorders; Veg Pest Update and Management; Cornell Tomato Breeding Program and Slicer Tomato Variety Trial Tour
Champlain Valley Orchard Field Afternoon

July 17, 2025 : Champlain Valley Orchard Field Afternoon
Chazy, NY
This July ENYCHP will be hosting an orchard field afternoon highlighting Mike's research trials at Chazy Orchards.