As late spring and summer temperatures begin to climb, the bacteria will go dormant when water in the soil is scarce and when temperatures are around 85-90☏.Īdditional treatment with Arbor-OTC at petal fall will continue to benefit the health of the tree until daytime temperatures reach this level. This shelf-stable water-soluble powder comes in two sizes and does not require refrigeration.Įarly spring injections of Arbor-OTC® just as buds break is the most optimum time to treat susceptible trees. However, if the weather conditions are most favorable for disease progression and spreading, the whole canopy can be severely affected with a burned appearance thus the name Fire Blight.Īrbor-OTC is a systemic, water soluble, injectable antibiotic for the annual suppression of bacterial diseases in non-food bearing trees and palms. By further spreading of the bacterium with rain splashes and insects to other flowers and shoots, symptoms will often appear scattered throughout the canopy. The bacterium moves into the wood of twigs and lateral branches, which express black cankers and can turn completely black. The first sign of a fire blight infection is early death of flowers and then green shoots immediately adjacent to the flower petiole. ![]() Trees infected with the fire blight bacterium Erwinia amylovora often have extensive limb cankers and dieback with a characteristic “Shepherd’s Crook” appearance at the tips of the shoots. Flower infections can be introduced by bees and other insects from infected wood cankers that ooze bacterial substance in the spring. ![]() This disease is most often found in pear, apple, loquat and crabapple trees and has become a nuisance to homeowners and commercial landscape managers.
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