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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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
Corn earworm adult moth.
PestWatch Report - September 6, 2017 - News News
Corn earworm counts spiked to a 3-4 day threshold in Erie, Lycoming, Washington, Westmoreland, and York Counties. More
Corn earworm counts increased in this farm in Montgomery County, PA. Photo: A. Frankenfield, Penn State
PestWatch Report - August 30, 2017 - News News
Corn earworm counts spiked to a 3-4 day threshold in Erie, Fayette, Lycoming, Washington, Westmoreland, and York Counties. More
Downy mildew on pumpkin. Photo: Beth K. Gugino, Penn State
Vegetable Disease Updates: August 30, 2017 - Articles Articles
Within the past week, there have been three separate reports of downy mildew on jack-o-lantern pumpkin in eastern Virginia. More
Severe foliar late blight symptoms on tomato. Photo: Beth K. Gugino, Penn State
Vegetable Disease Updates for August 23, 2017 - News News
Late blight suspected in Lehigh County, PA. More
Corn earworm trap in Montgomery County, PA. Photo: A. Frankenfield, Penn State
PestWatch Report on August 23, 2017 - News News
Most sites are above a 4-5, or 5-6, day spray threshold for corn earworm. More
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