By guest blogger Mary Concklin, Horticulture Extension Educator, PSU-Montgomery County
Fireblight is a bacterial disease that affects a wide array of plants. It is caused by the bacterium Erwinia amylovora. The bacteria enter plants through natural openings, such as open blossoms, and through wounds caused by pruning, mechanical injury (such as mower cuts), and hale cuts. Erwinia amylovora is spread by insects, rain and pruning tools.
This disease is fairly easy to spot with its classic “shepherds crook” at the terminal end of growth. When blossoms are infected, they will appear water soaked, turn brownish black and wilt. Severe infection can result in the death of the plant.
When pruning out an infected branch or portion of a branch, make your cut at least four to six inches below any visible signs of the disease. Disinfect pruning shears after each and every cut with a dilute chlorox solution or alcohol to avoid spreading the disease. Research has shown wiping the pruning blades in more effective than dipping them in the solution.
Spraying to control Fireblight is limited to Streptomycin (where resistance has not developed) and copper sprays. Another option is to plant Fireblight resistant plants. If you suspect you have Fireblight on a plant but are not sure, drop off or send a sample to our extension office for positive identification.
Do you have a gardening question? In Delaware County, call our Master Gardeners hortline at 610-690-2671 on Tuesdays and Thursdays from 9 AM-12 NOON.
UPCOMING MASTER GARDENERS EVENTS
June 14, 2008
Shade Gardening
Learn about annuals, perennials, bulbs, shrubs and trees that will help you develop your shade garden to its full potential. Cost: $10
July 12, 2008
Trees
Alan Jensen Seller, from The Care of Trees, will teach you about the trees on your property. Cost: $10
Registration required for all events. Please call 610-690-2655 for more information or visit our website for a registration form.
