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Petal Fall
Boron nutrition. See note at full bloom spray.
Cedar apple rust. If cedar apple rust is historically a problem in an orchard, refer to Table 5-3 and Part III: Chemical Management for management recommendations.
Fire blight. Prevent late blossom infections at petal fall, when environmental conditions are often favorable for fire blight.
Powdery mildew. The period of most rapid spread is from bloom until terminal growth stops. Where needed, add an effective fungicide to all sprays until terminal shoots stop growing. Standard types of wettable sulfur are not suggested after the first cover spray. See also Table 5-2 and Part III: Chemical Management for management recommendations.
Rosy apple aphid. If rosy apple aphid is a problem, use Provado 1.6F, 6-8 fluid ounces per acre, Actara at 4.5-5.5 ounces per acre, Assail at 1.1-2.5 ounces per acre, or Calypso at 2.0-4.0 fluid ounces per acre.
Spotted tentiform leafminer. Actara, Agri-Mek, Assail, Calypso, Clutch, Provado, and SpinTor are all very effective when applied at petal fall. The addition of a penetrating surfactant to the Agri-Mek and the SpinTor will increase activity toward leafminers.
Tufted apple bud moth. See Part II for a discussion of using Asana XL as a groundcover treatment.
White apple leafhopper. First-brood leafhoppers could be quite injurious at this time. Check for leafhopper activity during the next few weeks. Provado 1.6F at 3-6 fluid ounces per acre; Actara at 2.0-2.75 ounces per acre; Assail at 1.1-1.7 ounces; or Calypso at 2.0-4.0 fluid ounces will also control leafhoppers.
Plum curculio. Cool, wet weather may be responsible for extended activity and less pesticide residue. To improve control, use one of the broad-spectrum insecticides listed and shorten the spray interval during the next 3 to 4 weeks. Most orchards may need this application only for the three to four rows that border woods.
Obliquebanded leafroller. If obliquebanded leafroller larvae are present, use either Intrepid at 12-16 fluid ounces per acre, Rimon at 20 fluid ounces, or SpinTor at 5-7 fluid ounces.
Other insects. In orchards with a history of Oriental fruit moth problems, use Assail, azinphos-methyl, Avaunt, Calypso, or Imidan.
Pesticide Recommendations for Apples, Petal Fall
Green aphids and white apple leafhopper. If these insects occur concurrently, one of the following should control both. If one of the following insecticides is used, the rate of the petal fall insecticide above may be reduced by 25 percent.
