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Second, Third, and Fourth Covers
Apple scab. If infections from primary scab are a problem, use the fungicides listed for first cover, being careful to observe label restrictions.
Powdery mildew. If powdery mildew is a problem, refer to Table 5-2 and Part II: Diseases, Pests, and Natural Enemies for management recommendations.
Fire blight. Apply streptomycin within 24 hours of hail injury, especially in orchards where fire blight is a problem. Do not use streptomycin on apple trees within 60 days of harvest.
San Jose scale. Add Esteem 35WP at 4.0-5.0 oz/acre or Centaur at 35 oz/acre.
Aphids. See petal fall spray.
Dogwood borer. Handgun or backpack sprayer applications of Lorsban 50WP (3.0 lb/100 gal) or Lorsban 4E (1.5 qt /100 gal) during mid- to late June or after harvest and directed at burrknot-affected areas are most effective. Do not allow spray to contact foliage or fruit. Do not use a spray volume of more than 100 gallons per acre. Pheromone traps may be used to determine periods of male moth activity. These traps should be hung about 4 feet off the ground near the tree trunk.
Tufted apple bud moth. Growers having trouble with tufted apple bud moth should use Intrepid, Rimon, or SpinTor. Observe the proper spray intervals and close these intervals at the appropriate times in the egg-hatching period of both broods (approximately second to third and sixth to seventh covers). Use Table 2-8 or Table 2-9 to properly time sprays.
Maximum spray coverage is extremely important. Low-volume sprays (20-50 gal/A) often are not adequate. Growers should increase gallonage to 100 gallons per sprayed acre during the critical egg-hatching periods of both broods.
Cork and bitter pit in fruit. See Part I.
Increasing intervals between sprays. Beginning with the second or third cover, growers often increase the interval between half-sprays. When scab or mildew is present on trees, when shoot growth is rapid, and when rains are frequent, the intervals between half-sprays should not exceed 7 days.
Mites. This is the period when decisions to use a miticide should not be made hastily.Table 2-3 and Figure 2-3 are invaluable for making pest management choices, as they help take the guesswork out of mite control when using Stethorus. Miticide rates should not be increased above those suggested in the following chart if a biological control program is being followed. If using a miticide in a half-spray, do not add a miticide to the second half-spray unless it is needed. As a good practice, rotate miticide types to reduce the probability of resistance. When mite populations are high or increasing rapidly, apply miticides using more water, switch to every row middle sprays, use full rates of miticides, rotate the use of miticide products, use combinations of several miticides, and spray in the evening rather than the morning.
Pesticide Recommendations for Apples, Second, Third, and Fourth Covers