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
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
Be vigilant and scout for apple scab! Photo: K. Peter, Penn State
June Diseases for the Grower Radar - News News
Diseases for the fruit grower radar and their management strategies are discussed as we wrap up May and begin June. More
Too late to manage peach leaf curl when symptoms are present. Photo: K. Peter, Penn State
Disease of the Month: Peach Leaf Curl - News News
Peach leaf curl has caught many folks off guard this year. Tips for preventing the disease next season 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
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
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
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 Peach Fruit
Plum Pox Virus on Peach Fruit - Articles Articles
PPV symptoms on peach fruit. More
Plum Pox Virus on Peach Bark, Blossoms and Leaves
Plum Pox Virus on Peach Bark, Blossoms and Leaves - Articles Articles
PPV symptoms on peach bark, blossoms, and leaves. 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
Rhizopus Rot of Stone Fruit in Home Fruit Plantings
Rhizopus Rot of Stone Fruit in Home Fruit Plantings - Articles Articles
Rhizopus rot, caused by Rhizopus stolonifer, can be very destructive to harvested fruit. More
Powdery Mildew of Peach, Nectarine, and Apricot in Home Fruit Plantings
Powdery Mildew of Peach, Nectarine, and Apricot in Home Fruit Plantings - Articles Articles
Powdery mildew, sometimes called "rose mildew" can attack leaves, twigs, and fruit. More
Plum Pockets in the Home Fruit Planting
Plum Pockets in the Home Fruit Planting - Articles Articles
In the northeastern United States, the most important disease affecting American-type plums is known as plum pockets, or bladder plum. More
E. Levine, The Ohio State University, Bugwood.org
Plum Curculio in the Home Fruit Planting - Articles Articles
Climatic irregularities govern the activities of the plum curculio, Conotrachelus nenuphar, a pest injurious to pome and stone fruits throughout the state. More
Peach Scab in the Home Fruit Planting
Peach Scab in the Home Fruit Planting - Articles Articles
Peach scab appears to affect all cultivars of peach and is known to occur on nectarines, plums and apricots as well. More
Peach Leaf Curl in the Home Fruit Planting
Peach Leaf Curl in the Home Fruit Planting - Articles Articles
The peach leaf curl fungus destroys young peach leaves. Although new leaves develop, their growth reduces established food reserves, weakens the tree, and can reduce yield. 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
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
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
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