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Spinich Leafminer- Identification and Management

June 26, 2013

Spinich Leafminer- Identification and Management
The spinach leafminer (Pegomya hyoscyami) is a common pest that causes unsightly leaf blisters and necrosis of spinach, beets, chards and host weeds like lambsquaters, nightshade, chickweed and plantain. Marketability of the leaf crops is significantly impacted. This is the case for beet greens and bunched beets.

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



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Asparagus

Asparagus

Beets

Beets

Broccoli

Broccoli

Brussels Sprouts

Brussels Sprouts

Cabbage

Cabbage

Carrots

Carrots

Cauliflower

Cauliflower

Cucumbers

Cucumbers

Dry Beans

Dry Beans

Eggplant

Eggplant

Ethnic Vegetables

Ethnic Vegetables

Garlic

Garlic

Horseradish

Horseradish

Kohlrabi

Kohlrabi

Leeks

Leeks

Lettuce / Leafy Greens

Lettuce / Leafy Greens

Melons

Melons

Onions

Onions

Parsnips

Parsnips

Peas

Peas

Peppers

Peppers

Potatoes

Potatoes

Pumpkins / Gourds

Pumpkins / Gourds

Radishes

Radishes

Rhubarb

Rhubarb

Rutabaga

Rutabaga

Snap Beans

Snap Beans

Squash - Summer

Squash - Summer

Squash- Winter

Squash- Winter

Sweet Corn

Sweet Corn

Sweet Potatoes

Sweet Potatoes

Tomatoes

Tomatoes

Turnips

Turnips

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Upcoming Events

Cattaraugus Fresh Market Vegetable Meeting

Event Offers DEC Credits

June 29, 2022
East Otto, NY

This produce walk will feature peer-to-peer learning. All attendees should wear long pants. Free to attend. 2.0 DEC credits in categories 1a, 10, and 23.

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Orleans Fresh Market Vegetable Meeting

Event Offers DEC Credits

July 6, 2022
Albion, NY

This produce walk will feature peer-to-peer learning. All attendees should wear long pants. Free to attend. 2.0 DEC credits requested in categories 1a and 23.

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Chautauqua Vegetable Grower Meeting

Event Offers DEC Credits

July 12, 2022
Frewsburg, NY

This meeting will feature a fresh market field walk to facilitate grower-to-grower learning. All attendees should wear long pants. Free to attend. 2.0 DEC credits requested in categories 1a and 23. 

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Announcements

Lorsban is Banned: What Now?

Cabbage maggot (CM) feeds on brassica seedlings by tunneling into the stem of the plant just below the soil line. Their feeding can result in unsightly and unmarketable produce in the case of root brassicas like turnips, and in stunting, reduced stand, and reduced yield in head and stem brassicas like cabbage and broccoli. Lorsban and other formulations containing the active ingredient chlorpyrifos were the first line of defense for control of cabbage maggot in several brassica crops, because 1) at ~$10 per acre, it was affordable, and 2) it was easy to apply and avoided worker exposure as a directed spray at the base of the plant.

Unfortunately, Lorsban and all of its generic products for food and feed uses were banned in New York as of July 31, 2021, and in the United States as of February 28, 2022. In the absence of Lorsban and other chlorpyrifos-containing insecticides, NY brassica growers have 6 products belonging to 4 chemical classes available to manage cabbage maggot. This article, Lorsban is Banned: How to Control Cabbage Maggot in Brassicas Now?, written by Cornell Vegetable Program Specialist Christy Hoepting and Brian Nault of Cornell AgriTech, provides our "2022 Top Picks" to use instead of Lorsban plus results of Cornell research trial results related to application method, rate, and cabbage maggot control.


Propagating Strawberry Plants Through Runners

The production of strawberry plants is challenging due to the rigorous sanitation needs that must be met, especially in field propagation settings, but also in greenhouse settings. To add to that, growers in New York may find it more difficult to obtain their preferred strawberry varieties in the coming years, as fewer nurseries are propagating strawberries. The solution: strawberry plug plants propagated from runners in a controlled environment such as a greenhouse or high tunnel.

Plug production of rarer varieties that do well in New York State will fetch a higher price than dormant bare-root plants due to the higher cost of production and lower availability in the Northeast, especially if plants are available in August. Propagating Strawberry Plants Through Runners, written by Anya Osatuke of CCE Harvest NY and Brad Bergefurd of The Ohio State University, only discusses production and marketing potential of plug plants because successful field production of bare-root strawberries is very difficult to achieve without the use of highly restricted soil fumigants. 



Cornell Commercial Vegetable Guidelines Available

The 2022 Cornell Integrated Crop and Pest Management Guidelines for Commercial Vegetable Production are now available!

Written by Cornell University specialists, this publication is designed to offer producers, seed and chemical dealers, and crop consultants practical information on growing and managing vegetable crops in New York State. Topics include general culture, nutrient management, transplant production, postharvest handling, organic production, and managing common vegetable crop pest concerns. A preview of the Vegetable Guidelines can be seen online.

Cornell Crop and Pest Management Guidelines are available as a print copy ($43.50), online-only access ($43.50), or a package combining print and online access ($61.00). Shipping charges will be added to your order. Cornell Guidelines can be obtained through many local Cornell Cooperative Extension offices (call to confirm availability), or from The Cornell Store at Cornell University or call (844) 688-7620.


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