Publication 360, Fruit Production Recommendations:
Plum Calendar - Shuck (when most of the shucks are off)

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

1. Shuck (when most of the shucks are off)
   • Brown rot
   • Black knot
   • Oriental fruit moth
   • Plum curculio
   • Peachtree borer
   • Precautions
2. Other Plum Calendar Sections
   • Dormant (before bud break)
   • Green tip (just as buds are bursting)
   • Popcorn (when blossoms show white)
   • Bloom
   • 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

Brown rot (Shuck)

• Materials: Use one of:
  • Topas 250 E @ 500 mL/ha
    or Mission 418 EC @ 300 mL/ha
  • Indar 75 WSP @ 140 g/ha
  • Rovral @ 1.5 kg/ha
  • Vangard 75 WG @ 740 g/ha
  • Lance WDG @ 370 g/ha
  • Pristine WG @ 750 g/ha
  • Microscopic Sulphur - see label
  • Supra Captan 80 WDG @ 4.5 kg/ha
    or Maestro 80 DF @ 4.5 kg/ha
• Comments: To avoid resistance, alternate among fungicide groups and do not use more than two applications of Vangard or Rovral per season.
  Captan or Maestro: May cause leaf injury and spotting of the fruit on Stanley and Japanese plums under some circumstances.
  Pristine and Lance: Do not alternate Pristine with Lance.
• Learn more:
• Notes on Tender Fruit Insects & Diseases
  • Brown rot
  
  

Black knot (Shuck)

• Materials: Use one of:
  • Supra Captan 80 WDG @ 4.5 kg/ha
    or Maestro 80 DF @ 4.5 kg/ha
  • Indar 75 WSP @ 140 g/ha
• Comments: Captan or Maestro: May cause leaf injury and spotting of the fruit on Stanley and Japanese plums under some circumstances.
  Fungicides will not provide adequate control of black knot without proper orchard sanitation (pruning, removal, and burning of black knots).

Oriental fruit moth (Shuck)

• Materials: Use one of:
  • Altacor @ 285 g/ha
  • Delegate WG @ 420 g/ha
  • Assail @ 120-240 g/ha
• Comments:Altacor, Delegate: Apply at first egg hatch, 50-100 degree days C (base 7.2°C) after biofix (first sustained moth catch). Monitor populations and reapply 10-14 days later if required. Check the harvest dates of early varieties and do not spray within 10 days of harvest.
  Altacor: Do not exceed 645 g/ha per year.
  Assail: For optimum activity, use the 240 g/ha rate. Apply in a minimum spray volume of 1,000 L/ha. Do not apply more than once every 12 days. Will also control plum curculio.
• Learn more:
  • Notes on Tender Fruit Insects & Diseases
    • Oriental fruit moth
      
      

Plum curculio (Shuck)

• Materials: Use one of:
  • Assail 70 WP @ 240 g/ha
  • Guthion 50 WSB - see label
    or Sniper - see label
  • Imidan 50 WP @ 3.75 kg/ha
• Comments: If temperatures are high, spray when the shucks split.
  Assail: Under high insect pressure, may provide suppression rather than control of plum curculio.
• Learn more:
  • Notes on Tender Fruit Insects & Diseases
    • Plum curculio
      

Peachtree borer (Shuck)

• Materials: Use one of:
  • Isomate-P @ 250-625 dispensers/ha
• Comments: Isomate-P: Reduces mating of peachtree borer adults. Not effective on lesser peachtree borer. Initial population must be low for good results. Use in square or rectangular orchard blocks at least 4 ha in size; larger blocks are preferred.
  Apply pheromone dispensers before peach tree borer flight begins in the spring. The dispenser is designed to last an entire season, so early placement (shuck-split or earlier) will not reduce effectiveness. Attach the dispensers onto branches about the mid-point of the tree. Apply at least 250 dispensers per ha for low pressure sites and up to 625 dispensers per ha for high pressure sites. In addition to mating disruption, an insecticide for peachtree borer may be needed in high pressure sites. Populations are generally reduced over time where mating disruption is used for several seasons. For more information, see Using mating disruption in fruit crops.
• Learn more:
  • Notes on Tender Fruit Insects & Diseases
    • Peachtree borers
      

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