University of Kentucky College of Agriculture

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College publications are given 2-part "pub numbers" that are used to identify them. The first part (the prefix) is a set of letters that indicates which series the document belongs to. A series is a grouping of documents that share similar content.

The second part of the pub number is just a sequential number.

Series: Woody Ornamental Disease: Plant Pathology Factsheet

Volutella Blight of Boxwood
8/1/2017 (new)

Volutella blight (also called Pseudonectria canker) is the most common disease of boxwood in Kentucky landscapes and nurseries. This disease is caused by an opportunistic fungal pathogen that attacks leaves and stems of damaged or stressed plants. Winter injury, poor vigor, and stem wounds increase risk for Volutella blight. All species and cultivars of boxwood are susceptible. | PPFS-OR-W-26
web only | 4 pages | 226 words | 5 downloads | PDF: 1,568 kb

Flowering Dogwood Diseases
8/1/2017 (major revision)

The flowering dogwood is one of the most popular ornamental trees in Kentucky landscapes. Different cultivars, as well as different species and hybrids, offer a variety of flower and plant characteristics. Unfortunately, some common diseases can threaten the health of dogwood in both residential and commercial settings. | PPFS-OR-W-6
web only | 6 pages | 586 words | 15 downloads | PDF: 500 kb

Dothistroma Needle Blight of Pine
7/1/2017 (new)

Dothistroma needle blight disease afflicts some of the pine species commonly planted in Kentucky landscapes, resulting in needle browning and unattractive trees. Austrian pine and Mugo pine are most commonly affected. Dothistroma needle blight is infrequently observed on spruce. A closely related fungal disease called brown spot needle blight occasionally affects Scots pine or white pine, although this disease is less common in Kentucky. | PPFS-OR-W-25
web only | 3 pages | 256 words | 6 downloads | PDF: 1,053 kb

Common Diseases of Spruce in Kentucky
6/1/2016 (new)

Spruce trees, particularly blue spruce (Picea pungens) and Norway spruce (Picea abies), are popular specimen trees and screening conifers in Kentucky landscapes. Unfortunately, they can present problems for homeowners as a result of poor vigor, dieback, or needle drop. A combination of infectious disease and environmental stress is often to blame. | PPFS-OR-W-24
web only | 5 pages | 1,627 words | 16 downloads | PDF: 2,118 kb

Fungicides for Management of Landscape Woody Ornamental Diseases
4/1/2016 (reviewed)

This guide is a decision-making tool to help growers select fungicides from different chemical classes (FRAC). Additional information can be found in a number of UK Cooperative Extension Service publications or by contacting county Extension agents. | PPFS-OR-W-14
web only | 3 pages | 734 words | 10 downloads | PDF: 118 kb

Shade Tree Anthracnose
2/1/2016 (new)

Anthracnose is the common name given to several fungal shade tree diseases with similar dark, irregularly-shaped leaf lesions. While they are primarily foliar diseases, damage on some hosts may extend to twigs, branches, and buds. In established trees, anthracnose usually does not cause permanent damage. However, resulting defoliation and dieback, especially if it occurs year after year, can weaken trees and make them more susceptible to environmental stresses and secondary pathogens. | PPFS-OR-W-23
web only | 4 pages | 1,279 words | 6 downloads | PDF: 869 kb

Black Spot of Rose
2/1/2016 (reviewed)

Black spot is the most common and serious disease of roses in Kentucky. It is a problem in greenhouse production and outdoor plantings. | PPFS-OR-W-10
web only | 1 pages | 344 words | 8 downloads | PDF: 350 kb

"Wet Feet" of Ornamentals
11/1/2015 (new)

"Wet feet" is the common term for a condition that affects plant species intolerant of wet growing conditions. This problem occurs when soils become saturated with water, which, in turn, displaces available oxygen. Roots require oxygen to function; when oxygen is deficient, roots suffocate. Once root damage occurs, plants decline and may eventually die. While "wet feet" is an abiotic disorder and is not caused by infectious organisms, declining root health and wet soil conditions can inhibit the ability of some plants to thrive. This also provides ideal conditions for many root and collar rot water mold pathogens, such as Phytophthora and Pythium. | PPFS-OR-W-4
web only | 4 pages | 1,199 words | 8 downloads | PDF: 1,362 kb

Tree Wounds: Invitations to Wood Decay Fungi
9/1/2015 (new)

Wood decay leads to loss of tree vigor and vitality, resulting in decline, dieback, and structural failure. Wounds play an important part in this process since they are the primary point of entry for wood decay pathogens. While other factors may also result in decline and dieback, the presence of wounds and/or outward signs of pathogens provides confirmation that wood decay is an underlying problem. Wounds and wood decay reduce the ability of trees to support themselves. | PPFS-OR-W-1
web only | 7 pages | 1,947 words | 6 downloads | PDF: 2,953 kb

When White Pines Turn Brown: Common Problems of White Pines in Kentucky
4/1/2015 (new)

Eastern white pine (Pinus strobus) is a popular conifer in many Kentucky landscapes, although its use may be limited to loose, well-drained, pathogen-free soil. Often, needle browning is the primary symptom that alerts homeowners and nursery growers of health problems. In Kentucky, brown needles on white pine are often caused by one of the following three conditions: white pine decline, white pine root decline (Procerum root rot), or Phytophthora root rot. | PPFS-OR-W-22
web only | 4 pages | 1,497 words | 9 downloads | PDF: 1,170 kb

Diplodia Tip Blight of Pine
1/1/2015 (new)

Tip blight is a serious disease of landscape pines in Kentucky. Pines such as Austrian (Pinus nigra), Scots (P. sylvestris), and Mugo (P. mugo) are most commonly affected. Other landscape conifers occasionally may be affected by tip blight as well. Tip blight disease has not been found on eastern white pine (P. strobus). | PPFS-OR-W-21
web only | 3 pages | 922 words | 4 downloads | PDF: 1,268 kb

Boxwood Blight
11/1/2014 (new)

Boxwood blight is a disease of boxwood (Buxus spp.), causing rapid defoliation and plant dieback. The fungal disease is particularly devastating to American boxwood cultivars, which can defoliate within a week and die within one growing season. Plants are eventually weakened by repeated defoliation and dieback, and resulting plant stress and consequent colonization by secondary invaders result in plant death. | PPFS-OR-W-20
web only | 3 pages | 973 words | 1 download | PDF: 730 kb

Twig Blights of Juniper
6/1/2014 (new)

Twig and branch dieback is a common sight in many juniper plantings in Kentucky. While other factors can cause these general symptoms, two fungal diseases are frequently responsible for the dieback. | PPFS-OR-W-11
web only | 2 pages | 720 words | 1 download | PDF: 600 kb

Transplant Shock: Disease or Cultural Problem?
5/1/2014 (new)

When trees and shrubs are moved from one growing site to another (e.g. from nursery to landscape), they endure stress. If care is taken to minimize stress through proper transplanting techniques and maintenance, plants are likely to recover rapidly and become well-established in their new sites. Unfortunately, the opposite usually occurs. | PPFS-OR-W-19
web only | 10 pages | 706 words | 7 downloads | PDF: 2,476 kb

Leaf Scorch and Winter Drying of Woody Plants
6/1/2013 (new)

Leaf scorch symptoms can develop whenever water needed for growth and health of plant foliage is insufficient. While symptoms are often due to unfavorable environmental conditions, leaf scorch can also result from an infectious disease. Symptoms, possible causes, and management of leaf scorch are discussed below. | PPFS-OR-W-17
web only | 4 pages | 1,587 words | 3 downloads | PDF: 681 kb

Verticillium Wilt of Woody Plants
3/1/2013 (new)

Verticillium wilt can affect a wide range of ornamental trees and shrubs, as well as a number of tree fruits and woody small fruits. Over 400 herbaceous and woody plant species have been reported as hosts for this disease. | PPFS-OR-W-18
web only | 3 pages | 806 words | 1 download | PDF: 534 kb

Rose Rosette Disease
5/1/2012 (new)

Rose rosette is a devastating disease that is a threat to virtually all cultivated roses (Rosa spp.) in Kentucky, regardless of cultivar. Even rose cultivars known for their exceptional disease resistance and hardiness are susceptible to rose rosette disease. Losses can occur in home and commercial landscapes, nurseries, and botanical garden plantings. | PPFS-OR-W-16
web only | 3 pages | 962 words | 1 download | PDF: 383 kb

Black Root Rot of Ornamentals
5/1/2012 (minor revision)

Black root rot can affect a wide range of ornamentals in home and commercial landscapes, nurseries, and greenhouses. In Kentucky, this disease is commonly observed on Japanese and blue hollies, inkberry, pansy, petunia, and vinca. In addition to ornamentals, numerous vegetable and agronomic crops are susceptible. | PPFS-OR-W-3
web only | 3 pages | 873 words | 1 download | PDF: 585 kb

Sample Submission Protocol for Diagnosis of Thousand Cankers Disease in Walnut
2/1/2012 (new)

Thousand cankers disease (TCD) is a fatal disease of black walnut (Juglans nigra), and most recently, butternut (Juglans cinerea). The disease complex involves a fungus that is carried to trees by the walnut twig beetle, causing numerous cankers on branches and killing trees 5 to 6 years after infection. The disease complex is widespread in the western U.S., and has recently been identified in Tennessee, Pennsylvania, and Virginia. | PPFS-OR-W-15
web only | 2 pages | 557 words | 1 download | PDF: 361 kb

Bacterial Leaf Scorch
7/1/2007 (new)

Bacterial leaf scorch has devastated many landscape and shade trees in Kentucky's urban forests in recent years. Especially hard hit have been the mature pin oaks lining many urban streets. First diagnosed in the U.S. in the early 1980s, this epidemic shows no signs of abating. | PPFS-OR-W-12
web only | 6 pages | 1,885 words | 1 download | PDF: 249 kb

Shoestring Root Rot: A Cause of Tree and Shrub Decline
5/1/2005 (minor revision)

Most woody landscape plants are susceptible to shoestring root rot, cause of dieback and decline in the landscape. Diagnosis of this problem requires close examination of the base of the trunk which often reveals loose or decayed bark and dead cambium. By peeling back the bark one can often observe dark brown rhizomorphs (thick strands of hyphae), resembling narrow "shoestrings." | PPFS-OR-W-5
web only | 2 pages | 415 words | 1 download | PDF: 337 kb