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Penn State Extension news for vegetable and small fruit producers.
European corn borer. Photo: M. E. Rice
August 6, 2015

Corn earworm (CEW) increases have started, and a site in Lancaster County spiked dramatically. We may start to see increased from both immigration and locally produced 2nd generation CEW. Also, a 2nd generation of European corn borer (ECB) is in progress. Change to this can occur rapidly at this time of year.

Bacterial wilt of pumpkin (Photo: Beth K. Gugino)
August 6, 2015

This season has been rough on cucurbit crops across the state and many growers are seeing cucurbits wilting in their fields. There are a number of diseases like bacterial wilt, cucurbit yellow vine decline and Fusarium wilt as well as abiotic stresses such as water logged soils that can cause cucurbits to wilt.

August 6, 2015

Late blight was confirmed on tomato and potato from the same farm in Somerset County this past week. Both samples were genotyped as US23. As we head into fall, cooler evening temperatures and longer dew periods will favor the continued development of late blight.

Highlighted counties are where CDM outbreaks have been reported as of 6 August 2015. Red indicates the reports were made within the past 7 days. Map source: Cucurbit Downy Mildew ipmPIPE website.
August 6, 2015

Downy mildew is continuing to spread across Pennsylvania with additional reports on cucumber, pumpkin and butternut squash.

Spotted wing drosophila male. Photo: Alex Surcica
July 31, 2015

Spotted wing drosophila is being consistently found in low numbers in various locations across the northeast, so growers of susceptible berry or other fruit crops should be monitoring for this pest, and be prepared to take steps for management.

July 30, 2015

Over the past several years, bacterial diseases have become an increasing problem in tomato and pepper fields across Pennsylvania. Last year it was tomato while this year it seems to be more on pepper depending on where you are in the Pennsylvania.

Once sticky cards are placed in plastic bags, a marker can be used to highlight and count important insects.
July 29, 2015

Using sticky cards is an important component of scouting for insects in high tunnels. When looking at a particular insect on sticky cards, you may need to examine more than one specimen of the insect because it may be stuck on the card in a way that masks critical structures for identification.

Highlighted counties are where late blight outbreaks have been reported as of 28 July 2015. Red indicates the reports were made within the past 7 days. Map source: USAblight.org website.
July 28, 2015

Late blight has now been confirmed in 10 counties in New York as well as in Ontario Canada, Connecticut, New Jersey, Maryland and in one county in Pennsylvania (on potato). Reports have been on both tomato and potato.

Highlighted counties are where CDM outbreaks have been reported as of 28 July 2015. Red indicates that the reports were made within the past 7 days. Map source: Cucurbit Downy Mildew ipmPIPE website.
July 28, 2015

In Pennsylvania downy mildew has now been confirmed on cucumber in Lawrence, Elk and Berks Counties, on butternut squash in Lancaster and Columbia Counties and on jack-o-lantern type pumpkin in Clinton County.

July 28, 2015

Tomato hornworms on your tomato plants can be a problem from July through early September in Pennsylvania. This pest is not a big problem and for that reason it can be overlooked; however if populations explode you can rapidly see a lot of damage to the plants and fruit.

Downy mildew on the upper and lower leaf surface of pumpkin (Photo: Beth K. Gugino)
July 24, 2015

This afternoon downy mildew was confirmed on pumpkin growing on a commercial farm in Clinton County. This is the first report on pumpkin in the region.

Corn Earworm Photo credit H. Fescemyer
July 23, 2015

Most sites continue to report very low counts, but a 2nd generation of ECB has started, sites in western and central PA reported FAW, sap beetles have emerged in some southeastern sites, and Western bean cutworm (WBC) flights have started. Inspect silks for sap beetles.

Early symptoms of late blight on tomato or potato might include water soaked or pale green lesions that become dark brown in the center (Photo credit: Beth Gugino).
July 22, 2015

The late blight samples collected from the commercial potato field and potato cull pile in Erie Co., PA have been genotyped as US-23. The predominant genotype observed infecting both potato and tomato over the past several years.

Highlighted counties are where CDM outbreaks have been reported as of 22 July 2015. Red indicates that the reports were made within the past 7 days. Map source: Cucurbit Downy Mildew ipmPIPE website.
July 22, 2015

Although there have been no new confirmed reports in Pennsylvania, reports of downy mildew are continuing to increase across the eastern half of the U.S.

Elongated tan lesions characteristic of Northern corn leaf blight on corn (Photo: Allison Robertson, Iowa State Univ.).
July 22, 2015

In parts of south central PA, Northern corn leaf blight is being observed in sweet corn.

July 22, 2015

On a beautiful summer day we are on the road visiting Brett and Henry Stehr of Kenny Stehr and Sons Farm located in Pitman, Pennsylvania. The farm was started by their father in 1948 and in 1992 Brett and Henry became the owners. Brett runs the marketing side, while Henry runs the production side.

Spider mite damage on tomatoes causes stippling, yellowing and bronzing of leaves.
July 21, 2015

In hot dry weather spider mite populations can spike quickly. Although the weather this summer has been far from dry, where high tunnels have protected from the frequent rains, spider mites have been a problem.

Highlighted counties are where CDM outbreaks have been reported as of 16 July 2015. Red indicates that the reports were made within the past 7 days. Map source: Cucurbit Downy Mildew ipmPIPE website.
July 17, 2015

This past week reports of downy mildew are continuing to increase in the Great Lakes region with nine new counties reporting outbreaks on cucumber including Elk County, PA and as of today it was also confirmed on butternut squash in Lancaster County.

Corn Earworm Photo credit H. Fescemyer
July 16, 2015

Most sites continue to report very low counts for moth pests, but a 2nd generation of ECB has started, a few sites in western and central PA reported FAW, and sap beetles have emerged in some southeastern sites when worm sprays were removed. Inspect silks for sap beetles.

Brown lesions with pale green halo characteristic of late blight (Photo: Beth K. Gugino).
July 15, 2015

On Tuesday, late blight was confirmed in one commercial potato field and one potato cull pile in Erie Co., PA. These are the first reports of late blight in Pennsylvania.