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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Postharvest fungicide sprays are necessary to prevent defoliation from cherry leaf spot. Photo: K. Peter, Penn State
Getting the Upper Hand on Tree Fruit Diseases in July - News News
Conditions may be optimal for several fungal and bacterial pome and stone fruit diseases in July. More
Watch out for brown rot on sweet cherries. Photo: K. Peter, Penn State
Protecting Cherries From Brown Rot - News News
As the sweet cherry harvest commences, there are concerns about brown rot. Management options are discussed. More
Protect any trees still in bloom: Fire blight conditions ideal April 29 through May 2. (Photo: K. Peter)
Fire Blight, Apple Scab, Rust, Plus Others: Be On Alert! - News News
Conditions are optimal for fire blight, apple scab, and rust infections. Growers are encouraged to keep trees protected. Other diseases for the fruit grower radar are also discussed. More
Dormant copper sprays are encouraged to help keep diseases in check. (Photo: K. Peter)
Disease Management Strategies For The Grower Radar - News News
Consider applying dormant sprays soon to manage fungal and bacterial diseases this season. More
Gerald Holmes, California Polytechnic State University at San Luis Obispo, Bugwood.org
Home Orchards: Table 2.4. Plant Protection Materials - Articles Articles
Informational table showing pesticides available for home garden use on various fruit crops. More
Home Fruit Gardens: Table 1.2. Monthly Maintenance
Home Fruit Gardens: Table 1.2. Monthly Maintenance - Articles Articles
Your schedule may vary from the one below by as much as 2 weeks (earlier or later) depending on the region of Pennsylvania in which you are located. More
Home Orchard: Table 2.3. Pesticide Application Amounts Home Orchard: Table 2.3. Pesticide Application Amounts - Articles
Informational table showing pesticide application amounts on fruit. More
Black Knot Of Prunus in the Home Landscape
Black Knot Of Prunus in the Home Landscape - Articles Articles
The fungus Plowrightia morbosa (Apiosporina) causes the formation of dark brown to black, long, swollen galls or knots on the branches of most types of cultivated plums, prunes and cherries. More
Plum Pox Virus
Plum Pox Virus - Articles Articles

Plum Pox Virus

Kari A. Peter, Ph.D.

Plum pox virus (PPV), or Sharka, is a viral disease that infects not only plum but other economically important Prunus species. More
Plum Pox Virus on Cherry
Plum Pox Virus on Cherry - Articles Articles
PPV symptoms on cherry. More
Young galls are light in color and with age become dark and hard, ½ inch to 3 or 4 inches in diameter. Photo by B. Butler.
Tree Fruit Disease - Crown Gall - Articles Articles

Tree Fruit Disease - Crown Gall

Kari A. Peter, Ph.D.

Crown gall is caused by a bacterium, Agrobacterium tumefaciens, and affects apples, pears, quince, peaches, nectarines, apricots, plums, and cherries. More
Plant Quality in Home Fruit Plantings
Plant Quality in Home Fruit Plantings - Articles Articles
Purchase well-grown, heavily rooted, one-year-old plants of all fruits except blueberries and brambles. Two-year-old blueberry plants are recommended. More
Pests and Pesticides in Home Fruit Plantings
Pests and Pesticides in Home Fruit Plantings - Articles Articles
Can fruit crops be grown in the home garden without pesticides? The answer is yes, but fruit quantity and quality may decrease. More
Powdery Mildew of Cherry and Plum in Home Fruit Plantings
Powdery Mildew of Cherry and Plum in Home Fruit Plantings - Articles Articles
This disease is caused by Podosphaera clandestina, one of the common species of the powdery mildew group of fungi. More
Cytospora Canker of Stone Fruits in the Home Fruit Planting
Cytospora Canker of Stone Fruits in the Home Fruit Planting - Articles Articles
Cytospora canker, also known as perennial canker, peach canker, Valsa canker, and Leucostoma canker, can cause trees in young orchards to die. Infected trees in older orchards slowly decline. More
Cherry Leaf Spot in Home Fruit Plantings
Cherry Leaf Spot in Home Fruit Plantings - Articles Articles
Cherry leaf spot, caused by the fungus Blumeriella jaapii, attacks the leaves, leaf stems, fruit, and fruit stems of tart, sweet, and English Morello cherries. More
Brown Rot of Stone Fruit in the Home Fruit Planting
Brown Rot of Stone Fruit in the Home Fruit Planting - Articles Articles
Brown rot can cause a blossom and twig blight, a canker, a leaf infection, and a fruit rot. More
Black Knot of Plum in the Home Fruit Planting
Black Knot of Plum in the Home Fruit Planting - Articles Articles
Black knot of plum, caused by the fungus Apiosporina mobosa, is well-named because of the characteristic black, warty knots it forms on the branches of infected trees. More
Bacterial Spot of Stone Fruit in Home Fruit Plantings
Bacterial Spot of Stone Fruit in Home Fruit Plantings - Articles Articles
Bacterial spot occurs in most countries where stone fruits are grown. Common hosts include peach, nectarine, prune, plum, and apricot. Other hosts are sweet and tart cherry, almond, and wild peach. More
Bacterial Canker of Stone Fruit in the Home Fruit Planting
Bacterial Canker of Stone Fruit in the Home Fruit Planting - Articles Articles
Bacterial canker of stone fruit is caused by the two related bacterial species, Pseudomonas syringae and P. morsprunorum. More
Source: Bruce Watt, University of Maine, Bugwood.org
Stone Fruit Disease - Powdery Mildew of Cherry and Plum - Articles Articles
The disease is caused by Podosphaeria oxyacanthae, one of the common species of the powdery mildew group of fungi. More
Photo by G. Moorman
Plum Disease - Black Knot - Articles Articles

Plum Disease - Black Knot

Kari A. Peter, Ph.D.

Black knot of plum, caused by the fungus Dibotryon morbosum, is well-named because of the characteristic black, warty knots it forms on branches of infected trees. More
Tiny, black, spherical structures are produced on stalks above the white mold. Each of these contains thousands of spores that are released to float in the air. Photo by K. Peter.
Stone Fruit Disease - Rhizopus Rot - Articles Articles

Stone Fruit Disease - Rhizopus Rot

Kari A. Peter, Ph.D.

Rhizopus rot, caused by Rhizopus nigricans, can be very destructive to harvested fruit. More
The Cytospora canker fungus attacks the woody parts of stone fruit trees through bark injuries and pruning cuts, and through dead shoots and buds. Photo by K. Peter.
Stone Fruit Disease - Cytospora Canker - Articles Articles
Cytospora canker is one of the most destructive diseases of peaches, nectarines, apricots, sweet cherries, and plums in Pennsylvania. More
The disease first emerges on upper sides of leaves as tiny, red to purple, circular spots. After the leaves become infected, they turn yellow and fall. Photo by K. Peter.
Cherry Disease - Cherry Leaf Spot - Articles Articles
Cherry leaf spot, caused by the fungus Blumeriella jaapii (formerly Coccomyces hiemali), attacks the leaves, leaf stems, fruit, and fruit stems of tart, sweet, and English Morello cherries. More
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