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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Tree Fruit Disease Toolbox - Fungicide Resistance Management
Tree Fruit Disease Toolbox - Fungicide Resistance Management - Articles Articles
Resistance has sometimes resulted in pest-management-program failures. Below are presented tactics to help delay resistance to fungicides. 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
Plum Pox Virus Success Story
Plum Pox Virus Success Story - Articles Articles

Plum Pox Virus Success Story

John Halbrendt, Ph.D.

The successful eradication of PPV could not have been achieved without the cooperation of fruit growers, PDA, USDA/APHIS, USDA/ARS, Penn State, and homeowners. More
Plum Pox Virus - Replanting Stone Fruit in Sites Previously Affected by PPV
Plum Pox Virus - Replanting Stone Fruit in Sites Previously Affected by PPV - Articles Articles
Lifting the PPV quarantine in Pennsylvania offered the opportunity for a “fresh start” and growers must plan carefully to get the most from their investment. More
Stone Fruit Disease - Prunus Stem Pitting
Stone Fruit Disease - Prunus Stem Pitting - Articles Articles
Prunus stem pitting, caused by the tomato ringspot virus, is an important disease of all stone fruits. It is also called prune brownline and constriction disease. 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
Source: Mike Schomaker, Colorado State Forest Service, Bugwood.org
Stone Fruit Disease - Plum Pockets - Articles Articles

Stone Fruit Disease - Plum Pockets

Kari A. Peter, Ph.D.

In the northeastern United States, the most important disease affecting American-type plums is known as plum pockets, or bladder plum. It is caused by Taphrina communis. More
Source: Joseph OBrien, USDA Forest Service, Bugwood.org
Plum Disease - Plum Leaf Spot - Articles Articles

Plum Disease - Plum Leaf Spot

Kari A. Peter, Ph.D.

Leaf spot of plums and prune-type plums is caused by the fungus Coccomyces prunophorae. More
Source: Bugwood.org
Tree Fruit Disease - Phytophthora Collar, Crown and Root Rots - Articles Articles
Phytophthora collar, crown, and root rots, Phytophthora cactorum, continue to be a major cause of tree death in Pennsylvania orchards. These rots can affect both pome and stone fruit. 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
Stone Fruit Disease Control Toolbox - Fungicide and Antibiotic Timing
Stone Fruit Disease Control Toolbox - Fungicide and Antibiotic Timing - Articles Articles
Timing of a fungicide application in relation to disease development is important for achieving the best results. More
Bacterial spot on peach fruit. Photo by S. Bardsley.
Peach Disease - Bacterial Spot Differentiation from Copper Injury - Articles Articles
It can be confusing to discern between bacterial spot disease and copper injury. This article describes offers guidance to avoid the pitfalls of using copper for disease control. 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
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
Fruit infections begin as small brown spots, and under wet and humid conditions, ash-gray to brown tufts of fungus develop over the surface of the infected area. Photo by S. Bardsley.
Stone Fruit Disease - Brown Rot - Articles Articles

Stone Fruit Disease - Brown Rot

Kari A. Peter, Ph.D.

Brown rot is caused by the fungus Monilinia fructicola. It affects peaches, apricots, nectarines, plums, and cherries. 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
Infected leaves have angular spots, most numerous at the tip ends and along midribs. Photo by K. Peter.
Stone Fruit Disease - Bacterial Spot - Articles Articles
Bacterial spot, caused by the bacterium Xanthomonas arboricola pv. pruni (formerly Xanthomonas campestris pv. pruni), occurs in most countries where stone fruit are grown. More
Bacterial spot on peach fruit. Photo by S. Bardsley.
Stone Fruit Disease - Bacterial Spot, Refining Disease Management - Articles Articles
Bacterial spot, Xanthomonas arboricola pv. pruni, is a difficult disease to manage. More
Plum Pox Virus
Plum Pox Virus - Videos Videos
Part 3, 6 minutes. More
Plum pox virus symptoms on fruit.
Sharka / Plum Pox Virus - Videos Videos

Sharka / Plum Pox Virus

Kari A. Peter, Ph.D.

Plum pox virus (PPV) was discovered for the first time in North America in 1999 in a peach orchard in Adams County, Pennsylvania. More
Plum Pox Virus and Other Diseases of Stone Fruits
Plum Pox Virus and Other Diseases of Stone Fruits - Guides and Publications Guides and Publications

Plum Pox Virus and Other Diseases of Stone Fruits

Robert Crassweller, Ph.D., Grzegorz (Greg) Krawczyk, Ph.D., James Travis, Ph.D., Frederick E. Gildow, Jr., Ph.D.

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Identify what could be affecting your stone fruit. 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 Orchard: Table 2.3. Pesticide Application Amounts
Home Orchard: Table 2.3. Pesticide Application Amounts - Articles Articles
Informational table showing pesticide application amounts on fruit. 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
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
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