Publication 360, Fruit Production Recommendations: Apple Calendar

Publication 360, Fruit Production Recommendations: Apple Calendar - Bloom

Pub. 360, Fruit Production Recommendations > Apples > Apple Calendar > Bloom

Excerpt from Publication 360, Fruit Production Recommendations 2010-11,
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Scab (Bloom)

Resistance to Group 3 and Group 11 fungicides has been confirmed in Ontario. Check the status of these products before using them in your orchard.

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
- Supra Captan 80 WDG @ 3.75 kg or Maestro 80 DF @ 3.75 kg/ha
- Dikar @ 6.75 kg/ha
- Sovran @ 240 g/ha
- Flint 50 WG @ 140 g/ha
- Pristine WG @ 1.0-1.2 kg/ha
  - Comment: Pristine: Use the higher rate and a shorter interval during periods of rapid growth or when disease pressure is high.
- Nova 40 W @ 340 g + Dithane DG @ 3.00 kg/ha
- Nova 40 W @ 340 g + Polyram DF @ 3.00 kg/ha
- Nova 40 W @ 340 g + Maestro 80 DF @ 1.90 kg/ha
- Nustar @ 100 g + Manzate Pro-stick @ 3.00 kg /ha
  - Comment: Sovran, Flint, Pristine, Nova, Nustar: Do not use earlier than Tight cluster. See Table 2-11. Fungicide/Bactericide Groupings Based on Sites of Action. After last application of Sovran, Flint, Nova or Nustar tissue is protected from infection for 5-8 days. In conditions of rapid growth, shorten intervals between applications. Check label for details. Do not use Nova, Nustar, Flint, Pristine or Sovran if apple scab is present. Use of these products as eradicants may result in the development of fungicide resistance.
  - Comment: Serenade MAX: Provides suppression of apple scab. See Table 2-6. Efficacy Ratings for Pesticides, and notes on Serenade MAX, Bacillus subtilis (Serenade ASO, Serenade MAX).
For more information - Ontario CropIPM: Scab

Fire Blight (Bloom)

Materials: Streptomycin 17 @ 600 g/1,000 L
- Comment: Streptomycin 17: A model to time fire blight sprays is available. See information on MaryBlyt in OMAFRA Publication 310, Integrated Pest Management for Apples. Otherwise, apply sprays if temperatures over 18° C are accompanied by high humidity (over 69%), heavy dews or rainfall. Spray susceptible varieties beginning at first bloom until petal fall. Streptomycin is most effective when applied in high volumes of water prior to an infection period. Use alone for best results. Streptomycin 17 is UV light sensitive and is only effective for 2-3 days. Re-application is needed after 2-3 days if warm, wet conditions (above 20°C) are forecast. Use a maximum of three applications per season.
- Comment: Serenade MAX: Biopesticides are available for fire blight suppression. See Table 2-6. Efficacy Ratings for Pesticides, and notes on Serenade MAX, Bacillus subtilis (Serenade ASO, Serenade MAX).
For more information - Ontario CropIPM: Fire Blight

Do not apply insecticides while apple trees are in bloom.
See Bee Poisoning.

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
- Fire blight

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