Publication 360, Fruit Production Recommendations:
Blueberry Calendar - First bloom

Excerpt from Publication 360, Fruit Production Recommendations 2010-11,
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Table of Contents

1. Bloom
   • Phomopsis, Anthracnose fruit rot
   • Botrytis twig and blossom blight, Botrytis fruit rot (grey mould)
   • Precautions
2. Learn more
3. Other Blueberry Calendar Sections
• Dormant (late winter)
• Early Spring, prior to bud break
• Bud swell to pink bud
• Green tip
• Pink bud
• Green fruit
• Petal fall
• Green fruit
• Fruit ripening
4. Other Information on Blueberries
   • Blueberry Growth Stages
   • Blueberry Nutrition
   • Notes on Blueberry Insects and Diseases
   • Table 5-9. Products Used on Blueberries
   • Table 5-10. Activity of Fungicides on Blueberry Diseases
5. Blueberry Calendar PDF 190 KB
6. Pub 360 Chapter 5, Berry Crops - (PDF 364 kb)
7. Related Links

Phomopsis, Anthracnose fruit rot (First bloom)

• Materials: Apply one of;
  • Cabrio EG @ 1.0 kg/ha
  • Pristine WG @ 1.3 -1.6 kg/ha
  • Switch 62.5 WG @ 775 g/ha
  • Allegro 500 F @ 2.24 L /ha
• Comments: Pristine: Use 1.6 kg/ha for phomopsis stem canker.
  Pristine and Cabrio: Both include active ingredients in the same fungicide group. Use a maximum of two consecutive applications then alternate with fungicides from different families.
  Allegro: Provides suppression rather than control of these diseases. See Table 2-6. Efficacy Ratings for Pesticides
• Learn more:
  • Notes on Blueberry Diseases and Insects
    • Anthracnose fruit rot

Botrytis twig and blossom blight, Botrytis fruit rot "Grey mould" (First bloom)

Fungicides for botrytis blights are more important when wet weather occurs. Repeat at 7-10 day intervals through bloom if weather is wet. Choose fungicides from different families to reduce the development of resistant strains.

• Materials: Apply one of;
  • Supra Captan 80 WDG @ 2.25kg/ha or Maestro 80 DF @ 2.25kg/ha
• Ferbam 76 WDG @ 3.75 kg/1,000 L water
• Elevate 50 WDG @ 1.7 kg/ha
• Lance WDG @ 560 g/ha
• Pristine WG @ 1.3 kg/ha
• Switch 62.5 WG @ 775 g/ha
• Serenade ASO @ 4.0-15.0 L /ha
• Comments: Ferbam: Do not use later than mid-bloom.
  Serenade ASO: Provides suppression, rather than control, of botrytis blight. Expect best results from multiple applications or when used in rotation with other products. See notes on Bacillus subtilis (Serenade ASO, Serenade MAX).

   

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Precautions

Consult the product label for suggested water volumes. For mature highbush blueberries, use 700-1,000 L of water per ha unless otherwise noted on the label.


Products are listed according to insecticide and fungicide family groups. 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 5-9. Products Used on Blueberries

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Related Links

• OMAFRA Berry Crops Index Page
• Notes on Blueberry Diseases and Insects
• 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: Berry Crops
• OMAFRA Publication 360: Fruit Production Recommendations