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Japanese beetle damage on rose foliage. Photo credit: Lois Miklas
Simple Strategies to Deal with Garden Pests, Diseases - Articles Articles
You can create a relatively pest and disease free garden if you believe that ‘perfect’ plants are not the absolute goal of gardening and that all insects are not out to get you. More
Apple rust mites. Photo: David Biddinger
Tree Fruit Mite Pest - Apple Rust Mite - Articles Articles

Tree Fruit Mite Pest - Apple Rust Mite

Grzegorz (Greg) Krawczyk, Ph.D.

Apple rust mite, Aculus schlechtendali, is commonly found, but is rarely an important pest of apple in Pennsylvania. More
Protect tart cherries during bloom to prevent cherry leaf spot infection.
Tree Fruit Diseases - Spring Control Strategies - Articles Articles
May is the battleground month for disease management: be on alert for apple scab, fire blight, powdery mildew, rust, cherry leaf spot, brown rot, and bacterial spot infection conditions. More
Blister mites become active at bud break, migrate to the tender, new leaves, and burrow beneath the epidermis of the undersides of leaves to feed. This results in a gall, or blister, in which the eggs are laid. Photo by G. Krawczyk.
Tree Fruit Mite Pests - Pear Blister Mite and Pear Rust Mite - Articles Articles
Pearleaf blister mite, Phytoptus pyri, and pear rust mite, Epitrimerus pyri, are similar species, virtually invisible to the naked eye, that often are common on unsprayed trees. More
Left: gray mold; right: anthracnose fruit rot.
Strawberry Disease - Fruit Rot Protection Begins at Bloom - Articles Articles
Our two main targets for bloom time protection of strawberries are gray mold/ Botrytis fruit rot, and, if you are growing susceptible varieties like Chandler, anthracnose fruit rot. More
On leaves, cedar-apple rust first appears as small, pale yellow spots on the upper surfaces. The spots enlarge to about 1∕8 inch in diameter. Photo by K. Peter.
Apple Diseases - Rust - Articles Articles

Apple Diseases - Rust

Kari A. Peter, Ph.D.

There are three rust diseases: cedar-apple rust, hawthorn rust, and quince rust. The most common is cedar-apple rust, Gymnosporangium juniperi-virginianae. More
Photo 1. Early symptom of orange rust. Photo: K. Demchak
Bramble Disease - Managing Orange Rust - Articles Articles

Bramble Disease - Managing Orange Rust

Kathy Demchak, mahfuzur rahman

Orange rust, Gymnoconia nitens, is a systemic disease, any plants propagated from infected plants will also be infected. More
Once established in the wound, the fungus can quickly spread from infected fruit to adjacent healthy fruit during storage. Photo by K. Peter.
Apple and Pear Disease - Gray Mold - Articles Articles

Apple and Pear Disease - Gray Mold

Kari A. Peter, Ph.D.

Gray mold, Botrytis cinerea, is the most important postharvest disease of pears and is second to blue mold in importance to apple. More
Photo by Kathy Demchak.
Strawberry Disease - Gray Mold - Articles Articles
Gray mold, or botrytis blight, Botrytis cinerea, causes a greater loss of strawberry flowers and fruit than any other disease. It is found on green as well as ripening and harvested fruit. More
Grape Disease - Downy Mildew
Grape Disease - Downy Mildew - Articles Articles
Downy mildew, Plasmopara viticola, can infect berries, leaves and young shoots. It occurs wherever it is wet and warm during the growing season. More
stem canker (Leptosphaeria coniothyrium). Photo: Florida Division of Plant Industry , Florida Department of Agriculture and Consumer Services, Bugwood.org
Bramble Disease - Cane Blight - Articles Articles
Cane blight is caused by the fungus Leptosphaeria coniothyrium, which also causes a canker on roses and a fruit rot of apple and pear. More
Botrytis infection at site of feeding damage. Photo by Kathy Demchak.
Bramble Disease - Botrytis - Articles Articles
Botrytis fruit rot or gray mold, Botrytis cinerea, is the most common and most serious disease of Rubus species worldwide. More
Grape Disease - Botrytis Bunch Rot
Grape Disease - Botrytis Bunch Rot - Articles Articles
Botrytis bunch rot, or gray mold, exists in all vineyards worldwide. This disease is caused by the fungus Botrytis cinerea and is commonly associated with the decay of ripe or nearly ripe grapes. 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
Upper surface of affected shrub rose showing round leaf spots with an orange center on yellowing leaves. Image: R. Benner, Penn State
Rose Rust in the Landscape - Articles Articles
Rose Rust is uncommon on ornamental roses in Pennsylvania but it does occur, especially in mild, wet spring conditions. More
Figure 1. Drain plugs must be sealed. Photo: PA Mushroom IPM Handbook
IPM in Mushroom Production: Exclusion Techniques for Pest Control - Articles Articles

IPM in Mushroom Production: Exclusion Techniques for Pest Control

Maria Gorgo-Gourovitch, David Meigs Beyer, Ph.D., John A. Pecchia, Ph.D.

Exclusion prevents the entrance of pest organisms into new rooms and their escape from older ones. The latter should not be underestimated. More
Red thread disease, Corticium fuciforme, on perennial ryegrass. Courtesy of C. J. O'Rourke.
Diseases of Forage Grasses in Humid Temperate Zones - Articles Articles
Forage grasses are subject to a multitude of leaf, stem, floral, and root diseases. More
Florida Division of Plant Industry , Florida Department of Agriculture and Consumer Services, Bugwood.org
Cereal Rust Mite - Articles Articles
How to scout and manage cereal rust mite. More
Scott Bauer, USDA Agricultural Research Service, Bugwood.org
Gray Mold on Strawberries in Home Gardens - Articles Articles
Gray mold, or botrytis blight, is a common disease of a number of nonwoody plants worldwide and causes a greater loss of strawberry flowers and fruit than any other disease. More
Rust Diseases of Apple in the Home Fruit Planting
Rust Diseases of Apple in the Home Fruit Planting - Articles Articles
Cedar-apple rust, hawthorn rust, and quince rust spend part of their life cycle on the eastern red cedar and are problems only when red cedar is found close to the orchard. More
Cedar-quince rust on juniper
Cedar Apple And Related Rusts on Ornamentals - Articles Articles
Cedar-apple rust and closely related diseases, cedar-quince, cedar-hawthorn, and Japanese apple rusts are caused by fungi of the genus Gymnosporangium. More
Gerald Holmes, California Polytechnic State University at San Luis Obispo, Bugwood.org
Downy Mildew - Articles Articles

Downy Mildew

Gary W. Moorman, Ph.D.

Downy mildew is the common name for a group of highly specialized obligate parasites of vascular plants. More
Clemson University - USDA Cooperative Extension Slide Series, Bugwood.org
Botrytis or Gray Mold - Articles Articles

Botrytis or Gray Mold

Gary W. Moorman, Ph.D.

Botrytis is a pathogenic fungus found virtually everywhere plants are grown. More
N.S. Luepschen, Bugwood.org
Home Gardening: Rusty Spot of Peach - Articles Articles
Rusty spot of peach is characterized by the presence of rust-colored spots that can cover the entire surface of the fruit. More
University of Georgia Plant Pathology , University of Georgia, Bugwood.org
Downy Mildew on Grapes - Articles Articles
Downy mildew is caused by a fungus that can infect berries, leaves and young shoots. More
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