Plant Disease Identification and Control

Information on plant disease identification and control, including rot, freeze damage, rust, blight, mold, scales, bacteria, viruses, fungus, wilt, mildew, gall, mites, moths and cankers. Tips on integrated pest management and herbicide summaries.

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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
Map of cucurbit downy mildew currently reported along the east coast as of 30 June 2017 (cdm.ipmpipe.org).
Vegetable Disease Updates for June 30, 2017 - News News
Be on the lookout for diseases, as well as timber rot in high tunnel tomatoes, that spread in some of the recent rain events that moved across the 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
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
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
Pest and Plant Disease Prediction Tools
Pest and Plant Disease Prediction Tools - Articles Articles
There are several online tools to help you monitor and keep up to date on the proximity and likelihood for pests and plant diseases. More
Photo credit: B. Gugino
Plant Disease Basics and Diagnosis - Articles Articles
A plant disease is a dynamic process where a living or nonliving entity interferes with the normal functions of a plant over a period of time. More
Late blight on potato
Late Blight on Potato - Articles Articles
Photos showing late blight on potato. 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