Publication 360, Fruit Production Recommendations: Apple Calendar - Green Tip to Half-inch green

Table of Contents

1. Apple scab
2. Powdery mildew
3. Precautions
4. Learn more
5. Other Apple Calendar sections
   • Dormant
   • Half-inch green to tight cluster
   • Tight cluster to pink
   • Pink
   • Bloom
   • Late Bloom/Early Petal Fall
   • Petal fall (Calyx) when most petals have fallen
   • First summer spray (7 - 10 days after Calyx)
   • Subsequent summer sprays
   • Special summer sprays
   • Preharvest sprays
   • Postharvest treatment
6. Other Information on Apples
   • Apple Growth Stages
   • Apple Nutrition
   • Guidelines for Protecting Non-Bearing Apple Plantings
   • Notes on Apple Diseases
   • Thinning and Plant Growth Regulators
   • Table 4-7. Products Used on Apples
7. Chapter 4: Apple Calendar - PDF 357 kb
8. Related Links
   

Apple scab (Green Tip up to Half-inch Green)

Apply fungicides before spore release and keep growing leaves covered. See Apple scab for information on infection periods. Alternate materials from different groups.

• Materials: Use one of:
  • Manzate Pro-stick @ 6.00 kg/ha or Dithane DG @ 6.00 kg/ha or Penncozeb 75 DF @ see label
  • Polyram DF @ 6.00 kg/ha
  • Dikar @ 6.75 kg/ha
    • Comments: Dikar: When used in a full season program, Dikar will suppress mites. Higher water volumes help mite suppression. Consult label.
  • Supra Captan 80 WDG @ 3.75 kg/ha or Maestro 80 DF @ 3.75 kg/ha
  • Vangard 75 WG @ 370 g/ha
  • Scala SC @ 1.00 L/ha
    • Comments: Vangard or Scala: These products do not control other foliar or fruit diseases. Use once then rotate to a different group. Use a maximum of two applications per season, prebloom only.
    • Comments: Serenade MAX: Provides suppression of apple scab. See Table 2-6. Efficacy Ratings for Pesticides, and Bacillus subtilis (Serenade ASO, Serenade MAX).
• For more information - Ontario CropIPM: Apple scab

Powdery Mildew (Green Tip up to Half-inch Green)

If powdery mildew was a problem in previous years, then an application of a fungicide is necessary at this time. Spray susceptible varieties. If powdery mildew was prevalent the previous year, apply fungicides beginning at Green tip. Otherwise, begin application at Tight cluster and continue to First summer spray. Additional sprays beyond First summer spray may be needed on susceptible varieties or if disease pressure is severe.

• Materials: Use one of:
  • Nova 40 W @ 340 g/ha
  • Nustar @ 200 g/ha
    • Comments: Nova, Nustar: These products do not control scab and should be tank-mixed with a protectant fungicide. See options for apple scab control at Half-inch green to tight cluster.
  • Sovran @ 240 g/ha
  • Flint 50 WG @ 140-210 g/ha
    • Comments: Flint: For powdery mildew control, use 210 g/ha during pink to bloom stage.
  • Pristine WG @ 1.0-1.2 kg/ha
    • Comments: Pristine: Use the higher rate and a shorter interval during periods of rapid growth or when disease pressure is high.
  • Dikar @ 6.75 kg/ha
  • Microscopic Sulphur @ see label
  • Kumulus DF @ 22.5 kg/ha
    • Comments: Microscopic Sulphur, Kumulus: Do not use on Delicious because these products can cause an increase in red mite and scale insect populations.
    • Comments: Serenade MAX: Provides suppression of powdery mildew. See Table 2-6. Efficacy Ratings for Pesticides, and Bacillus subtilis (Serenade ASO, Serenade MAX).
• For more information - Ontario CropIPM: Powdery mildew

Precautions

Read the product label and follow all safety precautions.

Consult the product label for suggested water volumes. Otherwise, use enough water to ensure thorough spray coverage. Where the product rate is listed in amount per 1,000 L, and if a water volume is not provided on the label, use enough water to wet the foliage to the near drip point.

For information on identifying pests and monitoring apple orchards, refer to OMAFRA Publication 310, Integrated Pest Management for Apples.

Products are listed according to insecticide and fungicide group. Use products from different groups to prevent the development of pest resistance. For resistance management, refer to Pest Resistance to Insecticides, Fungicides, Miticides.
For preharvest interval, re-entry period, maximum number of applications and chemical group, see Table 4-7. Products Used on Apples.

Learn more:

• Notes on Apple Diseases
  • Apple scab

Related Links

• Ontario AppleIPM
• Apples in Ontario
• Integrated Pest Management (IPM)
• Pesticide Application and Safety
• Pesticide Companies and Agents
• Search the PMRA website
• Ontario Minor Use Program
• OMAFRA Publication 505: Ontario Weeds
• OMAFRA Publication 75: Guide To Weed Control: Tree Fruit