![]() ![]() Do not use streptomycin after symptom development since it may lead to antibiotic resistance in the bacterial population.Īluminum tris is a bactericide used prior to and during bloom.Ĭopper sprays are toxic to many species of bacteria. Streptomycin is an antibiotic that is acceptable for use to protect trees but may be difficult to obtain. The chemicals may be sold on various trade names. For specific instruction on sprays and timing please use the Midwest Tree Fruit Spray Guide. Expect blossom infections and plan to apply chemical sprays if: temperatures remain between 65 F and 86 F for a day or more during flower bloom, there is at least a trace of rainfall, the relative humidity remains above 60 percent for 24 hours, there is abundant succulent shoot growth, or there are fruit injuries from hail or other agents. Fertilization should be based on the results of foliar and/or soil nutrient analysis and should not be applied in excess.Ĭhemical sprays: Chemical sprays are preventive treatments that must be applied prior to the onset of fire blight symptoms sprays have little effect after the onset of symptoms. Similarly, limiting the amount of nitrogen fertilizer will reduce twig terminal growth. Annual pruning with avoidance of major cuts will help minimize tree vigor. ![]() There are some cultural practices that will help with prevention:Ĭultural practices: Minimizing rapid growth and succulent tissue will reduce the risk of fire blight developing on the susceptible young, succulent tissue. The following information is from CSU Fact Sheet: Fire Blight: Hot summer weather generally slows or stops the disease. ![]() Hail and wind damage provide wounds that allow the pathogen to enter at other times. Blight of twig terminals can occur in late May through June during wind driven rain events. Warm rainy springs are particularly conducive to rapid spread of the pathogen, resulting in blossom blight. The disease is most serious when spring temperatures during pre-bloom and bloom are warmer than average. 'Spring Snow' is one of those varieties that is susceptible to Fire Blight. The bacterial disease can be spread from one tree to anotherĪnd can cause considerable damage to the trees.ĭisease incidence varies from year to year and severity is influenced by cultivar susceptibility, tree age, succulence of tissues and spring meteorological conditions. Fire Blight is a bacterial disease that can occur i many varieties of crabapple. ![]()
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