Bloom

Use the same materials as recommended in white bud, popcorn stage.

Fire blight. Conditions favorable for fire blight include (1) open blossoms or succulent new growth, (2) average daily temperature above 65°F, plus (3) rainfall or relative humidity above 60 percent. The disease is likely to be severe in orchards where fire blight was present the preceding year. Most effective control is provided by streptomycin at 8 ounces per 100 gallons dilute (100 ppm) or 1.5 pounds per acre concentrate or at 4 ounces per 100 gallons dilute (50 ppm) or 0.75 pounds per acre concentrate or Regulaid at 1 pint per 100 gallons. Apply at least 50 gallons of spray per acre.

Apply the first spray as soon as there are open blossoms and during conditions as described in the previous paragraph. Repeat at 4- to 7-day intervals as long as there are open blossoms and weather conditions remain favorable for fire blight, or if these conditions recur. A minimum of two applications is needed for control. Refer to Part II: Diseases, Pests, and Natural Enemies for information on fire blight.

Leafspot, fruit spot, and scab. Do not go over 10 days between fungicide sprays during the bloom period. In wet weather, shorten the period to 7 days. Use the same fungicides as in the white bud spray.