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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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Community Gardens Soil Testing Program

Soil testing supports the growth and expansion of community gardens by protecting the health and safety of the food produced in these gardens. CCE Harvest NY, in partnership with the NYS Department of Agriculture & Markets (AGM) and the Cornell Soil Health Lab, is offering eligible, food-producing gardens in New York State the opportunity to send soil samples for testing without charge.

The soil test will analyze samples for heavy metals and nutrient levels. Test results help gardeners make appropriate plans to produce high quality fruits, vegetables, and flowers. Technical support and education for participating growers will be provided by the CCE Harvest New York team. Learn more about the 2025 Community Gardens Soil Testing Program.

Winter Cover Cropping in High Tunnels

Cornell Cooperative Extension is researching cover crops for high tunnel growers to better manage fertility and improve soil health. Our work has shown that winter cover cropping in high tunnels has the potential to add organic matter, improve soil structure, support microbial activity, and help with nutrient management by scavenging leftover nitrogen and/or fixing nitrogen. This publication, Management Practices for High Organic Matter Soils: Winter Cover Cropping in High Tunnels, shares best practices for winter cover cropping in high tunnels including species selection, planting rates and dates, termination, and cultural management considerations.

Laser Scarecrows to Deter Birds in Sweet Corn

Are you considering the use of a laser scarecrow to deter birds on your farm? Cornell Cooperative Extension and the University of Rhode Island teamed up to test a research laser scarecrow on sweet corn farms.

A laser scarecrow is a device that has one or more laser modules connected to motors. The specifications of the lasers are optimized to the color and motion sensitivity of bird's eyes. When laser beams move across a field, birds become frightened and attempt to move away from the perceived threat. Light from the laser covers an area quickly and moves through the canopy without causing injury to the crop. Research demonstrates that birds do not readily become habituated to the laser.

A laser scarecrow used as the sole deterrent typically results in a significant reduction in crop damage. Combined with an auditory device, damage can be reduced even more. When used as part of an integrated management program for bird control that utilizes habitat management and multiple scare tactics, laser scarecrows can be useful tools for growers of multiple crops. All scare tactics must be deployed before birds find the field. The effectiveness of lasers depends on multiple factors such as bird species, bird populations, habitat and food availability. Lasers are not effective at deterring deer, racoons, coyotes or other mammals.

To learn more, the Laser Scarecrows to Deter Birds in Sweet Corn and Other High-Value Agricultural Crops fact sheet provides background information, research data, FAQs, and Advantages/Limitations on laser scarecrows.

NY Urban Farms Pest Management Fact Sheet Series

Cornell Cooperative Extension has partnered with dozens of urban farms across New York State to demonstrate and evaluate sustainable pest management strategies. Together with farmers, we found success using control methods that prevent or reduce crop losses through exclusion strategies, crop timing, host resistance, the introduction of beneficial organisms, and more. Regardless of management strategy used, common requirements for success include a knowledge of the pest and disease complex, preventative deployment and commitment to the process. The New York Urban Farms Sustainable Pest Management Fact Sheet Series includes case studies highlighting pest management techniques that New York urban farms have found valuable.

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