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

1. Dormant (before bud break)
• Black knot
• Precautions
2. Other Plum Calendar Sections
   • Green tip (just as buds are bursting)
   • Popcorn (when blossoms show white)
   • Bloom
   • Shuck (when most of the shucks are off)
   • First cover (12 days after Shuck)
   • Second cover
   • Prepick
   • Special sprays (when monitoring indicates the need)
   • Postharvest fruit treatment
3. Other Information on Plums
   • Heat spot
   • Thinning plums
   • Notes on Tender Fruit Insects & Diseases
   • Table 7-10. Products Used on Plums
   • Table 7-11. Activity of Fungicides on Stone Fruit Diseases
   • Tender Fruit Nutrition
4. Plum Calendar (PDF 103 KB)
5. Chapter 7 - Tender Fruit Calendar PDF 401 KB
6. Related Links

Black knot (Dormant)

• Prune out all black knots from commercial orchards during the dormant period before bud break. Make the cut 15 cm below the swelling. Collect and burn all prunings with knots. Knots left lying on the ground are a source of spores that start new infections. Destroy affected wild and neglected plums near the orchard. See OMAFRA Factsheet Black Knot of Plums, Order No. 05-017, for more information.

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.

Products are listed by fungicide and insecticide group. Use products from different groups to prevent 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 7-10. Products Used on Plums.

Related Links

• 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 360: Fruit Production Recommendations