See All Pest, Disease and Weed Identification

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Dull, olive green areas visible on the undersides of leaves are the first evidence of apple scab.
Tree Fruit Disease - An Apple Scab Review - Articles Articles
Early season apple disease management is primarily directed at controlling scab. 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
Predator mite attacking European red mite. Photo courtesy of Dr. David Biddinger
Orchard IPM - European Red Mite Biological Control - Articles Articles

Orchard IPM - European Red Mite Biological Control

Dave Biddinger, Ph.D., Tara Baugher, Tianna DuPont

Infestations of red mites can result in smaller fruit and a reduced fruit bloom the following season. More
In recognition of their work in eradicating Plum Pox Virus, research and industry partners received a USDA award. Pictured is Jim Lerew, one of the local growers recognized in the ceremony.
Plum Pox Eradication in PA - A Blueprint for Future Plant Disease Outbreaks - Articles Articles
In an increasingly global society, the transmission of viruses and various diseases has been facilitated through our own technologies. 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
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
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