Pests and Diseases
Pests and diseases can decimate agronomic crops and result in huge financial losses. Make use of Penn State Extension’s substantial library of resources including recommendations for managing weeds, insects, and disease pests in a variety of agronomic crops. Find tips on dealing with bacteria, molds, fungal diseases, and rot.
Agronomic Crops Diseases and Integrated Pest Management
There are several ways to deal with pests. If you want to use pesticides on your agronomic crops you may need a license. To maintain a valid applicator’s license in Pennsylvania, private pesticide applicators must fulfil a continuing education requirement. Penn State Extension provides a number of workshops for anyone looking to become certified or recertified. They include Agronomic Pesticide Update workshops, an online course covering What's New in Agronomic Pest Control, and an Agronomic Pesticide Update Webinar. The Penn State Agronomy Guide also covers pest management.
Many different pests can affect agronomic crops; for example, slugs are a challenging pest for no-till farmers. New herbicide products are regularly released making pest management even more demanding. It’s not something crop producers have to face on their own. Certified crop advisers can help producers with pest management as well as studying soil and water, crop, and nutrient management.
Common Corn Pests and Diseases
A number of different pests and diseases can affect corn crops at various growth stages. Mild temperatures and increased humidity, for example, can lead to corn leaf blight and gray leaf spot. Corn ear rot and mycotoxins can also be a problem when humidity is high. Knowing what corn diseases to look for means you can make the right decisions on what to spray, and indeed whether to spray at all.
As well as combating diseases, corn producers also have a number of pests to contend with. An increase in reduced-tillage culture and planting corn into sod and small grain cover crops has led to an increase in armyworm damage.
Several species of billbugs feed on corn plants causing damage in May. The adults chew small holes in the stems which can severely retard or even kill small plants.
Pests that cause damage below ground can be challenging to control, particularly in corn production. Crop rotation is one way to reduce numbers. The seedcorn maggot is one example.
Common Soybean Pests and Diseases
Soybean production has steadily been increasing in Pennsylvania. Being able to assess soybean fields for insect damage and learning how to recognize soybean pests are important factors for successful and profitable agronomic crop production. The soybean aphid, for example, is an exotic pest of soybean that can heavily stress plants, leading to a reduction in yields of up to 40%.
Soybean diseases such as stem canker, brown stem rot, and sudden death syndrome can also wreak havoc on soybean crops.
Wheat and Small Grains Common Pests and Diseases
For wheat and small grains producers, there is the added complication of pests being present in stored grain. The Angoumois Grain Moth, for example, can make grain smell unpleasant, making it less attractive for consumption. Foreign grain beetles are a fungus-feeding insect commonly found in grain stored on farms in Pennsylvania. The sawtoothed and merchant grain beetles are two more pests that can contaminate stored grains.
Effective control of stored grain pests requires an IPM approach that combines sanitation, identification, monitoring, and preventive practices.
- News
Preparing Grain Storages for Harvest
Date Posted 9/15/2026Properly preparing grain storages for harvest. - Articles
How Choices Made at Planting Impact Barley and Wheat Health
The important work of ensuring disease-free small grains happens before we even put a seed in the ground. - News
Fall Weed Control in Pastures, Hay, and Other Forages
Date Posted 9/1/2026Fall is an excellent time to manage biennial and perennial weeds and Japanese stiltgrass in pastures and hay and to control problem weeds after silage harvest. - News
As Corn Harvest Progresses, Watch for Damage from Western Corn Rootworm
Date Posted 8/25/2026Even with the newest transgenic traits, continuous corn fields may suffer from feeding by corn rootworm, so as corn harvest gets underway, stay alert for unexpected damage. - Articles
Soybean Stem Diseases: What are the Different Symptoms and Signs?
Are soybean growth and development variable? Take a close look at the roots and stems to determine what may be the cause. - Articles
Scouting for Stalk Rots in Corn
Stalk rots can occur when corn plants are weakened due to other abiotic or biotic stressors. - Articles
Not Every Spot Is the Same: Identifying Corn Leaf Diseases
Not every spot on a corn leaf means the same thing. From tar spot to corn stunt, learn the diagnostic clues that can help you correctly identify what is affecting your crop. - Articles
Sawtoothed and Merchant Grain Beetle
The sawtoothed grain beetle, and the closely related merchant grain beetle, can be found with other insects in contaminated stored grains in Pennsylvania. - News
Fungicide Considerations for Corn and Soybean
Date Posted 7/21/2026Does the earliest report of tar spot tell us anything about this year's fungicide needs? - News
Corn Leaf Aphid, an Argument Against Tank Mixing Insecticides
Date Posted 7/21/2026Treating fields unnecessarily with insecticides can result in large aphid populations. - Articles
Managing Western Corn Rootworm Resistance to Bt on the Fringe
Farms with continuous corn production, and specifically fields planted to the same Bt year after year, are at most risk for developing resistant rootworm populations. - News
Watch for High Corn Rootworm Populations and Their Damage
Date Posted 7/14/2026With rootworm adults emerging from corn fields, this is the time of year to notice large populations of rootworm beetles or their damage to corn plants. - News
Play it Safe: Clean Your Sprayer Equipment Before and After Each Use
Date Posted 7/7/2026Cleaning your sprayer to prevent potential crop injury is worth the time; learn how below. - Articles
Brown Marmorated Stink Bug
The brown marmorated stink bug (BMSB) was first collected in September of 1998 in Allentown, but probably arrived several years earlier. - Articles
Potato Leafhopper on Woody Ornamentals
The potato leafhopper has been noted on more than 200 host plants, many of which are ornamental plants. However, this insect is best known as a field crop pest. - Articles
Snailcase Bagworm
The snailcase bagworm is a moth (family Psychidae) that was accidentally introduced into the United States from Europe in the 1940s. - Articles
Tarnished Plant Bug
Plant bugs are a large, diverse family of insects that feed by sucking sap from plants, especially parts with high rates of cell division like buds and flowers. - Articles
Drugstore Beetle
The drugstore beetle, Stegobium paniceum (Linnaeus), is a common insect in Pennsylvania that infests stored foods, seeds, and other materials. - News
Double-Crop Soybeans: Weed Management Considerations
Date Posted 6/16/2026As small grain harvest begins, double-crop soybean planting will soon follow in some areas of the state. Below are considerations for weed control. - Articles
IPM in Schools is Now Law
New legislation at the state level requires schools to provide notification to parents, students and teachers in advance of pesticide applications. - News
2026 Pennsylvania Slug Monitoring Project
Date Posted 6/9/2026This is the last slug update. Low slug numbers found. - News
Watch for Black Cutworm, Bean Leaf Beetle, and Cereal Leaf Beetle
Date Posted 6/2/2026Scout for black cutworm in corn fields, bean leaf beetle in young soybean fields, and cereal leaf beetle in small grains - News
Are Mycotoxins Hiding in Your Organic Corn? Penn State Launches Farmer Survey
Date Posted 5/19/2026A new survey aims to quantify the impact of mycotoxins on organic corn production. - News
2026 Updates to the PENN IPM Hotline
Date Posted 5/19/2026The PENN IPM hotline provides short production-related messages from faculty and educators through a touch-tone phone interface. New features are now available for the hotline for 2026. - Articles
The 1-800-PENN-IPM Hotline
The 1-800 PENN IPM line is designed to provide concise messages on important production and management issues for growers of specialty and field and forage crops including vegetables, cut flowers, small fruit, tree fruit, Christmas trees and all things agronomic. Certain content is also available in Spanish.




























