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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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
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
Yellowmargined leaf beetle (YMLB) adult. Photo: Michael Skvarla, Penn State
Yellowmargined Leaf Beetle Serious Pest in Pennsylvania - Articles Articles

Yellowmargined Leaf Beetle Serious Pest in Pennsylvania

Michael J. Skvarla, Shelby Fleischer, Ph.D.

Yellowmargined leaf beetle (YMLB) (Microtheca ochroloma) is a serious pest of cruciferous crops. More
Asexual spore, Sporangia of Phytophthora capsici, host: Cucurbita spp. L. Photo: Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org
Vegetable Disease Research: Tools in the Battle Against Phytophthora - Articles Articles
Over the past decade, Phytophthora blight has dramatically spread to “clean” farms. As a result, growers have seen healthy crops completely fail. More
High Tunnel Vegetable Crops: Designing a Scouting Plan
High Tunnel Vegetable Crops: Designing a Scouting Plan - Articles Articles

High Tunnel Vegetable Crops: Designing a Scouting Plan

Elsa Sanchez, Ph.D., Cheryl Frank Sullivan, Margaret Skinner

Scouting for insect and mite pests and their natural enemies in in high tunnels is the cornerstone for successful integrated pest management (IPM). More
Yellow Striped Armyworm is on the March
Yellow Striped Armyworm is on the March - News News
And heading to your tomato greenhouse or high tunnel! More
Allium Leafminer Adult
Alert: The Allium Leafminer is active! - News News
The Allium Leafminer has emerged this week and we are already seeing feeding damage signs. Protect your crop! More
Explorando e Identificando Enfermedades en Tomates
Explorando e Identificando Enfermedades en Tomates - Videos Videos

Explorando e Identificando Enfermedades en Tomates

Marley E Skinner, Montserrat Fonseca Estrada, Tianna DuPont, Mike Basedow

8:37

Este video revisa los fundamentos de la exploración adecuada y la identificación de enfermedades comunes y sus síntomas. More
Sclerotia of Slerotinia White Mold (Timber Rot) on a tomato stem.
Frequently Asked Questions about Timber Rot on Tomato - Articles Articles
I lost a lot of tomato plants to Sclerotinia/White mold/Timber Rot this past season, while I’ve seen some in past years, why was it so bad this season? More
Figure 2. Pupae in base of allium plants. They have been in the pupal stage throughout the summer, and should emerge as adults this fall. Photo: L. Donoval.
Fall Re-Emergence of the Allium Leafminer - News News
It’s soon time for emergence of allium leafminer adults. More
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