Content tagged "disease"

How do trees "heal" after they have been wounded?

Trees for Energy Conservation Updated: April 27, 2016

Trees and woody plants don't heal. A healed wound has had the tissue repaired or replaced, which would be evidenced by a scab or scar on skin. Trees are not...


Scrapie is a fatal contagious disease of sheep and goats that causes degeneration of the central nervous system. Scrapie is contracted early in life and is...

Contagious Caprine Pleuropneumonia (CCPP)

Contagious Caprine Pleuropneumonia (CCPP) is a highly contagious infectious disease of goats caused by the Mycoplasma mycoides capri and Mycoplasma F38...

Biosecurity for Small Poultry Flocks

Written by: Dr. Jacquie Jacob, University of KentuckyThe term biosecurity refers to the measures taken to prevent the introduction and/or spread of disease...

What is plant pathology?

Ag Zone Science for Youth Updated: June 12, 2014

Plant pathology is the field of agriculture that deals with the study of plant diseases. Plant disease can result in the loss of millions of pounds of food...


Goats Updated: September 30, 2013

Botulism is a rare and strange disease. Occasional cases can be seen in individual animals or as a herd outbreak due to contaminated feed or water. A herd...

Enzootic Ataxia

Goats Updated: September 30, 2013

Although most often reported as a problem in Australian sheep, enzootic ataxia has been reported in goats in the United States. First, two definitions:...

Apple Scab

Apples Updated: August 14, 2013

Apple scab is the most important fungal disease of apples in eastern growing regions of the United States, especially in the cooler climate regions. If not...

How can I prevent diseases such as Avian influenza from infecting my backyard flock?

To help prevent disease in your backyard flock, incorporate these common preventative measures:For more information, refer to the page on Biosecurity for...

Powdery Mildew

Apples Updated: November 07, 2012

Powdery mildew can be a persistent disease of susceptible apple cultivars throughout the United States. It is one of the most predominant diseases in the...

Disease Management in Apple Trees and Fruit

Apples Updated: November 07, 2012

My chickens have dark warts and sores on their faces, wattles, and combs. What's wrong?

Small and Backyard Flocks Updated: September 28, 2012

Dark warts and sores on chickens' faces, wattles, and combs may indicate fowl pox. Fowl pox is a slow-spreading viral disease characterized in the cutaneous...

Goat Anthrax

Goats Updated: June 28, 2012

This disease results from infection by the bacterium Bacillus anthracis. This bacteria requires oxygen to survive and has two forms, the vegetative form and...

Fire blight

Apples Updated: March 27, 2012

Fire blight is a destructive bacterial disease of apples and pears that kills blossoms, shoots, limbs, and, sometimes, entire trees. The disease is generally...

The grape clusters on the vines have spots on them. What caused it and what, if anything can be done about it? What causes the grapes on my vine to turn dark and shrivel up like raisins?

Grapes Updated: March 16, 2012

Black rot, caused by the fungus Guignardia bidwellii, consistently destroys grapes in the Midwest and Eastern USA, especially during wet seasons. During...

Managing Apple Trees and Orchards: Insects, Diseases, Wildlife and Other Challenges

Apples Updated: November 07, 2011

What diseases are problematic when planting apple trees in heavy soils?

Apples Updated: August 28, 2011

Heavy soils are those that contain more clay particles relative to sand and silt components. The high clay content causes the soils to be less friable,...

What causes the yellow leaf spots that later develop a brown center on my apple leaves?

Gardens & Landscapes Apples Updated: August 28, 2011

This a fungal disease called cedar-apple rust. Cedar-apple rust is a common disease of apple and crabapple. The fungus that causes the disease,...

Goat Respiratory Diseases

Goats Updated: August 24, 2011

What is apple union necrosis and decline, and how do I identify and manage the disease?

Apples Updated: August 22, 2011

Apple union necrosis and decline is caused by tomato ringspot virus, which also causes disease in other fruit trees, small fruits, and many herbaceous...

Which apple rootstocks are susceptible to fire blight?

Apples Updated: August 22, 2011

Consider the relative susceptibilities of the scion and rootstock to fire blight when establishing new orchards. There is considerable variation among apple...

What is apple mosaic virus, and how do I identify and manage the disease?

Apples Updated: August 22, 2011

Apple mosaic virus is one of the oldest known and most widespread apple viruses. The same virus can cause line pattern symptoms in plum and rose mosaic...

What is bitter rot, and how do I identify and manage the disease?

Apples Updated: August 22, 2011

Bitter rot is a fungus disease that causes fruit rot during the summer and preharvest period. The bitter rot fungi are almost worldwide in distribution and...

What is black pox, and how do I identify and manage the disease?

Apples Updated: August 22, 2011

Black pox is a fungus disease caused by Helminthosporium papulosum. It is considered to be of minor economic importance. When it occurs, the disease can...

What is blister spot, and how do I identify and manage the disease?

Apples Updated: August 22, 2011

Blister spot is a bacterial disease of apple fruit caused by Pseudomonas syringae pv. papulans. This disease is of economic importance mainly on the cultivar...

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This work is supported by the USDA National Institute of Food and Agriculture, New Technologies for Ag Extension project.