Fire blight treatment3/2/2024 ![]() Avoid the use of high nitrogen fertilization, which promotes increased shoot elongation.Various products are labeled for application to apples, pears and ornamentals. During growing season prune at least 12 inches below the diseased area and disinfect pruners between cuts. Fireblight (Erwinia amylovora) gets its name from the appearance of trees and shrubs which have been badly infected by this. Streptomycin is a bactericide used to control fire blight.During dormancy (dry weather) prune infected branches.Fireblight chiefly affects those members. ![]() Expect to see damage from late spring until autumn. ![]() Cambistat, a tree growth regulator, can also be used to minimize shoot growth, which will minimize the shoot blight stage of a fire blight infection. Fireblight is a disease caused by the bacterium Erwinia amylovora. A foliar spray treatment in the spring temporarily suppresses rapid shoot elongation during the peak infection period by the fire blight pathogen potentially reducing the susceptibility of the host to shoot tip infections. Trimtect does not have direct antibiotic activity against the fire blight pathogen ( Erwinia amylovora), but can reduce the host susceptibility. If not managed, fire blight can destroy the blossoms, fruit, and stems of the plant, and even kill the plant. The leaves on blighted terminals turn brown to black and usually remain. The infection spreads down the pedicel and the tissue becomes water-soaked and dark green. Infected blossoms suddenly wilt and turn a light to dark brown. Treat trees that expressed visible symptoms in previous growing seasons or high value trees growing adjacent to symptomatic trees. Disease symptoms first appear when trees are blooming and they include blossom, spur, and terminal blight. A combination of cultural practices to reduce tree susceptibility and disease spread, and chemical control to protect against infection can reduce the disease. Aggressive: Cut 2.5 feet from edge of infection with sanitized loppers. It is caused by the bacteria Erwinia amylovora, which can infect fruit, flowers, twigs, and leaves of infected plants. There is no single management practice that completely controls fire blight. Fire blight removal treatments: Best management practice (BMP): Cut 12 to 18 inches from edge of symptoms into two-year-old wood with sanitized shears. Fire blight is a serious bacterial disease that affects apple trees, as well as other hosts such as pear, crabapple, and mountain ash. The best treatment for Fire Blight is to apply a trunk injection of Arbor-OTC systemic antibiotic in the spring prior to flowering.
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