Publication 360, Fruit Production Recommendations:
Currant and Gooseberry Calendar - Postbloom: as soon as bloom is complete

Table of Contents

1. Postbloom: as soon as bloom is complete
   • Leaf spot
   • Powdery mildew
   • Currant fruit fly
   • Precautions
2. Other Currant and Gooseberry Calendar Sections
   • Just before blossoms open
   • Bloom
   • 10 days after postbloom spray
   • Postharvest
3. Other Information on Currants and Gooseberries
• Currant and Gooseberry Nutrition
• Table 5-11. Products Used on Currants
• Table 5-12. Disease Ratings on Selected Currant and Gooseberry Varieties
4. Currant and Gooseberry Calendar - PDF 91 kb
5. Pub 360, Chapter 5, Berry Crops - PDF 364 kb
6. Related Links

Postbloom: as soon as bloom is complete

Leaf spot (Postbloom)

• Materials: Use one of;
  • Ferbam 76 WDG @ 6.75 kg/ha
  • Copper 53 W @ 5.0 kg/1,000 L plus hydrated lime @ 4.0 kg lime/1,000 L
• Comments: Apply at weekly intervals in the spring if weather is wet, but not within 14 days of harvest. Ferbam is not labelled for gooseberries.

Powdery mildew (Postbloom)

• Materials: Use one of;
  • Microscopic Sulphur @ 5.00 kg/ha
  • Pristine WG @ 1.6 kg/ha
• Comments: Resistant varieties are available, see Table 5-12. Disease Ratings on Selected Currant and Gooseberry Varieties. Prune out infected twig tips in fall and avoid excessive nitrogen. If warm and humid conditions persist, repeat weekly until fruit begins to colour. Spray fungicides before symptoms develop. Pristine is registered for suppression rather than control of powdery mildew.
• Learn more:
  • Notes on Currants and Gooseberries Insects and Diseases
    • Powdery mildew

Currant fruit fly (Postbloom)

• Materials: Malathion 25 W @ 2.50 kg/1,000 L water
• Comments: Larvae infest fruit, causing it to ripen prematurely. Spray to control adult flies, which lay eggs on green fruit. Spray where this pest has been a problem in the past or use yellow sticky traps to monitor for adult activity. Make two applications, 10 days apart. Malathion is most effective when temperature is above 20°C.
• Learn more:
  • Notes on Currants and Gooseberries Insects and Diseases
    • Currant fruit fly

Precautions

Read the product label and follow all safety precautions.
Always 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 according to insecticide and fungicide family groups. Use of products from different groups helps 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 5-11. Products Used on Currants.

Related Links

• Notes on Currant and Gooseberry Diseases and Insects
• OMAFRA Berry Crops Index page
• 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