Do not extend intervals between sprays during a prolonged pre-bloom period. Rusts and powdery mildew See recommendations under tight cluster-prepink spray, page 36. Under heavy quince rust pressure, control with the strobilurin fungicides, Sovran and Flint, may be inadeauate. This may involve planned alternations of full sprays or selecting an SI fungicide soon after a quince rust infection period. Fire blight Fire blight is most active during warm weather.
Blossom infection is aggravated by showers which splash the blight bacteria.
Apply streptomycin as needed at 0.3 lb per 100 gal dilute or 1.2 lb per acre concentrate. Streptomycin remains effective for 3 to 5 days. The effectiveness of streptomycin can be increased by including the adjuvant Regulaid at the rate of 1 pint per 100 gal tank mix, however, the increased uptake of streptomycin with Regulaid is more likely to result in streptomycin injury . Shoot blight suppression results from hardening off of vegetative shoot growth starting about 10 days after the initial Apogee application, which should be made at late bloom when active shoot growth is 1-3 inches long. Apogee is not to be considered a replacement for streptomycin sprays for blossom blight control.