Pests and Diseases

Recommendations for managing weeds, pests and diseases in vegetables like corn, tomatoes, potatoes, onions, asparagus, squash and peppers. Tips on dealing with worms, maggots, leafminers, beetles and mites, and scouting pests with your smartphone.

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Does Your Business Need a Spotted Lanternfly Permit?
Does Your Business Need a Spotted Lanternfly Permit? - Articles Articles
Find out if your business or organization is required to have a Spotted Lanternfly permit in Pennsylvania. More
Gray mold sporulation has a dark gray, concentric ring pattern and may develop lesions on the surface of the plant stems. Photo: Beth K. Gugino, Penn State
Vegetable Disease Update: September 13, 2018 - News News
This fall as temperatures drop, dew periods extend, and the skies remain cloudy, be on the lookout for late blight and Botrytis gray mold in high tunnel tomatoes. More
Spotted Lanternfly Banding
Spotted Lanternfly Banding - Videos Videos

Spotted Lanternfly Banding

Elizabeth Finlay, Donald Seifrit

4:33

Banding trees with sticky tape can capture and kill spotted lanternfly nymphs and adults. This non-toxic, inexpensive technique can be used on any tree. More
V-shaped lesions characteristic of black rot on the leaves of cole crops. Photo: Beth K. Gugino, Penn State
Vegetable Disease Update: September 6, 2018 - News News
New reports of cucurbit downy mildew have decreased across the region, but variable weather conditions are forecasted through the weekend. More
Irregular tan cracked lesions characteristic of anthracnose on a cucumber leaf. Photo: Beth Gugino, Penn State
Vegetable Disease Update: August 29, 2018 - News News
The drier conditions the past few days have slowed the epidemic spread of cucurbit downy mildew across the region. More
Powdery (white spots) and downy (dark spots) mildew sporulation on the lower pumpkin leaf surface. Photo: Beth Gugino, Penn State
Vegetable Disease Update: August 23, 2018 - News News
With all the flooding it is important to remember that crops that are exposed to flood waters originating from a stream or river are considered adulterated and should not be harvested for market. More
Small chlorotic lesions caused by downy mildew on the upper surface of acorn squash. Photo: Beth Gugino, Penn State
Vegetable Disease Update: August 16, 2018 - News News
Cucurbit downy mildew is continuing to pick-up speed with many new reports on cucumber in Ohio, New York, and Massachusetts. More
Reduced till straw mulch serving as a barrier between developing pumpkin fruit and bare soil protecting against soilborne pathogens that cause fruit rots. Photo: Beth Gugino, Penn State
Vegetable Disease Update: August 9, 2018 - News News
Downy mildew is becoming more widespread on cucumber across Pennsylvania and has been confirmed on cucumbers in Centre, Clinton, Mifflin, Bucks, Lehigh, and Lancaster Counties. More
Corn earworm counts are rising throughout PA.
Vegetable - Small Fruit Production Issues: August 2, 2018 - News News
July started out dry and hot but transitioned quickly, with almost no warning, to very wet and hot. More
Downy mildew lesions on pumpkin. Photo: Beth Gugino, Penn State
Vegetable Disease Update: August 1, 2018 - News News
The wet weather is wreaking havoc in many vegetable fields. More
Angular leaf spot on the upper surface of a cucumber leaf. Photo: Beth Gugino, Penn State
Vegetable Disease Update: July 26, 2018 - News News
The current relentless rain is expected to intensify foliar bacterial diseases on many crops. Scouting for diseases and protection of crops will be critical in the upcoming days. More
Downy mildew lesions on the upper surface of a cantaloupe leaf. Photo: Beth Gugino, Penn State
Vegetable Disease Update: July 19, 2018 - News News
No new reports of late blight since the confirmations on tomato in York County and on potato and tomato in southern Lancaster County a couple of weeks ago. More
Japanese beetle on raspberries. Photo: Kathy Demchak, Penn State
Vegetable - Small Fruit Production Issues: July 12, 2018 - News News
Downy mildew was confirmed on cucumber in Mifflin County on July 11. Warmer weather throughout the state is helping crops along, but has also been good for insect pests. More
Septoria leaf spot on tomato. Photo: Beth Gugino, Penn State
Vegetable Disease Update: July 11, 2018 - News News
The general shift to drier weather has slowed down disease development across the state. More
Angular lesions caused by downy mildew. Photo: Beth Gugino, Penn State
Vegetable Disease Update: July 5, 2018 - News News
Downy mildew has most recently been confirmed on cucumber in southern New Jersey and Maryland. Late blight has been confirmed on tomato in York County and on potato and tomato in southern Lancaster County. More
Anthracnose (Colletotrichum orbiculare) on watermelon. Photo: Jason Brock, University of Georgia (bugwood.org)
Watch Out for Fungal Diseases On Melons - News News
Your melon crops should be well on their way by now, and with the rain we’ve had, fungal diseases may be too. More
The potato leafhopper, Empoasca fabae, is a pest that is easy to overlook until the damage - called "hopperburn" - "burns" you. Photo: Penn State College of Agriculture
Vegetable - Small Fruit Current Issues: June 28 2018 - News News
Wet weather and variable temperatures across the state continue to be challenging for vegetable and berry production. More
Late season powdery mildew on pumpkin may severely weaken the handles and reduce marketability. Photo: Beth Gugino, Penn State
Powdery Mildew Management in Cucurbits for 2018 - News News
Powdery mildew continues to be an annual concern in cucurbit production. More
Irregularly shaped late blight lesion on a tomato leaf with characteristic white sporulation on the underside of the leaf. Photo: Beth Gugino, Penn State
Vegetable Disease Updates for Mid-June 2018 - News News
Downy mildew has been confirmed in Dorchester County MD on cucumber, late blight confirmed on tomato transplants, and there have been a number of reports of poor potato seed emergence. More
Black rot on cabbage, caused by the bacterium Xanthomonas campestris pv. campestris. Note characteristic “V” shaped lesions starting at leaf margin. Photo: Lee Stivers, Penn State
Vegetable - Small Fruit Current Issues: Mid-June 2018 - News News
Cloudy weather, rainstorms, and variable temperatures across the state have slowed some crops and created very favorable conditions for disease development. More
photo by John Esslinger
Twilight Vegetable Meeting - Workshops Workshops
Free evening meeting that will cover current insect and disease issues, pesticide interactions, and also provide pesticide credits. More
Pepper transplants. Photo: Tom Ford, Penn State
Vegetable - Small Fruit Current Issues: May 18, 2018 - News News
It’s no secret that this spring has been cold and wet across Pennsylvania. On many farms, planting has been delayed as much as three weeks, and many crops already in the ground are developing more slowly than usual. More
Allium leafminer feeding damage on onion leaves. Photo: Tim Elkner, Penn State
Allium Leafminer Now Active in Southeast Pennsylvania - News News
Leaf symptoms of adult allium leafminer activity were observed on chives, garlic and wild garlic in a home garden in the Leola area of Southeast Pennsylvania on April 13, 2018. More
Pepper plants. Photo: Lee Stivers, Penn State
Hot Water Treatment for Tomato and Pepper Seeds - News News
We have fielded a number of questions this winter about using hot water treatments for tomato and pepper seeds. More
Vegetable Pesticide Update
Vegetable Pesticide Update - Workshops Workshops
A two hour educational session for commercial applicators. More
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