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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
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
Symptoms of potato blackleg. Photo: Bob Leiby, PA Coop Potato Growers
Best Management Practices for Soft Rot Associated with Dickeya in Potatoes - Articles Articles
An aggressive form of black leg/soft rot caused by the bacterial pathogen Dickeya dianthicola has been confirmed in potato seed lots being grown in Northeast regions including Pennsylvania. More
Tomato-Potato Late Blight in the Home Garden
Tomato-Potato Late Blight in the Home Garden - Articles Articles
This article describes tomato-potato late blight, including symptoms; disease development, cycle, and management; and management after harvest. More
Gray fuzzy sporulation characteristic of leaf mold on the underside of a tomato leaf. Yellow chlorotic spots will be visible on the upper leaf surface.
Leaf Mold on Tomato: Host Resistance is a Management Option - Articles Articles
Leaf mold is not just a high tunnel disease, it can also be a problem in the field when conditions are favorable. More
Bacterial Spot of Tomato: Biology and Management
Bacterial Spot of Tomato: Biology and Management - Articles Articles
Bacterial spot is becoming an increasingly devastating disease of tomato. The pathogen can directly damage the fruit, and severe foliar infection can lead to defoliation. More
Cucurbit Yellow Vine Decline in Pumpkins
Cucurbit Yellow Vine Decline in Pumpkins - Articles Articles
A number of different diseases including bacterial wilt and Fusarium wilt can cause cucurbits collapse in the field. Unfortunately, cucurbit yellow vine decline is another one to be concerned about. More
Bacterial wilt of pumpkin (Photo: Beth K. Gugino)
Why Are My Cucurbits Wilting? - Articles Articles

Why Are My Cucurbits Wilting?

Beth K. Gugino, Ph.D.

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. More
Potato Cultivars Suggested for Pennsylvania and Resistance Characteristics
Potato Cultivars Suggested for Pennsylvania and Resistance Characteristics - Articles Articles
Host resistance is an important tool for managing diseases. Potato cultivars vary in susceptibility to common diseases including late blight, early blight and common scab. More
Early blight symptoms on potato leaf
Early Blight - Articles Articles

Early Blight

Beth K. Gugino, Ph.D.

Early blight is caused by the fungus Alternaria solani and is a common problem for potato growers. More
Tomato late blight. Photo credit Beth Gugino, Penn State Plant Pathology.
Plant Disease Basics - The Disease Triangle - Articles Articles
Disease management begins with the fundamental understanding the three factors must be present and interact for disease to develop. More
Ecological Disease Management
Ecological Disease Management - Articles Articles

Ecological Disease Management

Beth K. Gugino, Ph.D.

In order for a plant to become diseased three conditions must be met: (1) a pathogen, (2) a favorable environment where the pathogen can thrive, and (3) a susceptible host. More
Cómo diagnosticar un problema en la planta – 101
Cómo diagnosticar un problema en la planta – 101 - Articles Articles
¿Hay algún problema con su planta? ¿Cuál es la causa? No asuma que sabe la respuesta y accidentalmente trate el problema equivocado. More