The bacteria can also spread to other trees through rain splash, wind, or contaminated tools.įactors That Contribute to Disease Development If conditions are right, the bacteria multiply rapidly and move through the tree’s tissues, causing the characteristic wilting and blackening symptoms. Once the bacteria reach the blossoms, they can infect the tree. In the spring, the bacteria ooze out of the cankers and are spread to blossoms through rain or insects. The fire blight bacteria overwinter in cankers on the tree. Infected blossoms may appear water-soaked and wilt rapidly, while infected fruits often shrivel and turn dark but remain on the tree. However, a common symptom is the wilting, blackening, and “burning” of branches, which gives the disease its name. Symptoms of fire blight can vary depending on the tree and the part of the tree infected.
The bacteria are often spread by insects, rain, and wind and can also be transferred from one tree to another through contaminated pruning tools. The bacteria can infect a wide range of tissues including blossoms, leaves, shoots, branches, fruits, and even the rootstock. Fire Blight – Causesįire blight is caused by the bacterium Erwinia amylovora. However, knowledge is power, and the more you learn, the better equipped you’ll be to win the battle. Fire Blight on Apple Trees: What To Knowįire blight is a serious bacterial disease that strikes fear in many home gardeners.
#FIRE BLIGHT CRABAPPLE HOW TO#
Fire blight can spread to other trees, particularly those in the Rosaceae family, and can come back every year if conditions are favorable.ĭon’t let diseases and pests rob your apple trees of their potential - learn how to protect your orchard with expert insights and practical solutions in my must-read article, Apple Tree Diseases and Pests.Treatment options include the use of antibacterial sprays, applied at the right time, to prevent the disease from spreading.Prevention strategies include sanitation measures, pruning and thinning techniques, and planting resistant apple varieties.It causes wilting and blackening of branches and fruits, giving the tree a “burned” appearance. Fire blight is a bacterial disease that primarily affects apple trees and other members of the Rosaceae family.
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