See All Pest, Disease and Weed Identification

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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
Figure 1. Lodged corn seen from a distance.
Corn rootworms Suspected of Resistance to Bt Corn Varieties Discovered - Articles Articles
Western corn rootworms that developed resistance to some Bt corn varieties may now be a problem in PA. 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
Alfalfa Weevil
Alfalfa Weevil - Articles Articles

Alfalfa Weevil

John Tooker, Ph.D.

Alfalfa weevil is one of the two most-damaging insect pests of alfalfa in Pennsylvania (the other is potato leafhopper). It is an exotic species that likely evolved in Asia, but appears to have been introduced to the U.S. at least three times. 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
Mourad Louadfel, Bugwood.org
Keep an Eye Out for Cereal Leaf Beetle - Articles Articles
Scout now for infestations of cereal leaf beetle in small grain fields. The larval stage feeds on the leaves and fields appear white if heavily infested. 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
Assessing Soybean Fields for Insect Damage
Assessing Soybean Fields for Insect Damage - Articles Articles
This time of year (July) a suite of insect pest species are feeding upon soybean foliage. 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
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: a pathogen, a favorable environment where the pathogen can thrive, and a susceptible host. 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