Publication 360, Fruit Production Recommendations:
Pear Calendar - Petal fall

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

1. Petal fall
   • Plum curculio
   • Pear psylla
   • Obliquebanded leafroller, Green fruitworm
   • Rust mite, European red mite
   • Leaf spots, Scab
   • Precautions
2. Other Pear Calendar Sections
   • Dormant
   • Green tip
   • White bud (white petals showing on flowers)
   • Bloom
   • Special spray (when monitoring indicates the need at Petal fall)
   • First cover
   • Special spray (when monitoring indicates the need at First cover)
   • Summer sprays
   • Second cover
   • Special sprays (when monitoring indicates the need about mid-Aug. and early Sept.)
   • Postharvest fruit treatment
3. Other Information on Pears
   • Thinning pears
   • Notes on Tender Fruit Insects & Diseases
   • Table 7-9. Products Used on Pears
   • Table 7-11. Activity of Fungicides on Stone Fruit Diseases
   • Tender Fruit Nutrition
4. Pear Calendar PDF 130 KB
5. Chapter 7 - Tender Fruit Calendar PDF 401 KB
6. Related Links
   

Plum curculio (Petal fall)

• Materials: Use one of:
  • Actara 25 WG @ 385 g/ha
  • Calypso 480 SC @ 440 mL/ha
  • Guthion 50 WSB - see label
    or Sniper - see label
• Comments:Actara: Do not apply when bees are in the orchard. After an Actara application, wait at least 5 days before placing bee hives in the orchard.
  Calypso: Research indicates that application of Calypso at petal fall plus 3 days is the optimal timing for plum curculio. However, if monitoring indicates plum curculio is in the orchard prior to this timing, then insecticides should be applied at petal fall.
  
• Learn more:
  • Notes on Tender Fruit Insects & Diseases
    • Plum curculio

Pear psylla (Petal fall)

• Materials: Use one of:
  • Agri-Mek 1.9% EC @ 1.0 L/ha
  • Assail 70 WP @ 120 g/ha
  • Actara 25 WG @ 385 g/ha
  • Movento 240 SC @ 365 mL/ha
  • Ambush 500 EC @ 400 mL/ha
  • Thionex 50 W @ 6.75 kg/ha
  • Guthion 50 WSB - see label
    or Sniper - see label
  • Pyramite @ 600 g/ha
    or Nexter @ 600 g/ha
• Comments: Agri-Mek: Do not use within 14 days of a Captan or Maestro application. Apply no later than 21 days after petal fall for best results. Apply Agri-Mek with 10 L Superior Oil and a minimum of 1,000 L of water per ha, when most mites are in the nymph stage. May cause russeting to d'Anjou and other sensitive varieties. Maximum one application per season. Alternate yearly with other insecticides. Agri-Mek will not control plum curculio.
  Actara: Do not apply when bees are in the orchard. After an Actara application, wait at least 5 days before placing beehives in the orchard.
  Movento: Has slow activity; control may not be apparent for 2-3 weeks. Under high pressure a second application may be necessary 2 weeks later. Do not use when fruit is present due to the possibility of injury. See the Movento label for additional details. If psylla pressure is high, use the higher labelled rate of 435 mL/ha. Do not exceed 1.83 L/ha per year.
  Pyramite, Nexter: There is little commercial experience with these products for psylla.
• Learn more:
  • Notes on Tender Fruit Insects & Diseases
    • Pear psylla

Obliquebanded leafroller, Green fruitworm (Petal fall)

• Materials: Use one of:
  • Dipel 2X DF @ 1.125 kg/ha
    or Foray 48BA @ 2.8 L/ha
    or Bioprotec CAF @ 4.0 L/ha
  • Success 480 SC @ 182 mL
    or Entrust 80 W @ 109 g/ha
  • Delegate WG @ 420 g/ha
  • Intrepid 240 F @ 750 mL/ha
  • Altacor @ 285 g/ha
  • Imidan 50 WP @ 3.75 kg/ha
  • Guthion 50 WSB - see label
    or Sniper - see label
• Comments: For overwintering obliquebanded leafroller apply at petal fall. Spray in orchards with historical pest problems or high pest pressure (1-2% of the terminals or buds have larvae or damage).
  OBLR are resistant to organophosphate insecticides in most commercial apple orchards. Cross-resistance to pyrethroids, Confirm and Intrepid is possible. Avoid treating sequential generations with products from the same chemical group. See Strategies for managing resistance to insecticides.
  Dipel, Foray, Bioprotec (B.t. products): Make two applications at 5-7 day intervals if activity of the larvae is extended. For best results when using B.t. products, acidify spray mix to below pH 7.0 and apply at dusk or on overcast days. See Biopesticides and reduced risk products for insect control.
  Place pheromone traps in orchards at petal fall to monitor OBLR adults.

Rust mite, European red mite (Petal fall)

• Materials: Use one of:
  • Carzol SP @ 1.1 kg/ha
  • Envidor 240 SC @ 750 mL/ha
  • Kanemite 15 SC @ 2.1 L/ha
• Comments: To control rust mite and prevent russeting fruit, apply a miticide at prebloom or petal fall. Alternate miticides.
  Carzol: Is harsh on beneficial mites and honeybees.
  Envidor: works slowly, especially in cool weather. Control may not be apparent for 2-3 weeks. Apply before mite populations build up.
  Kanemite: Is not effective on rust mites.
• Learn more:
  • Notes on Tender Fruit Insects & Diseases
  • Mites
    

Leaf spots, scab (Petal fall)

• Materials: Use one of the fungicides listed for scab at Green tip.
• Comments: If wet weather persists, additional sprays will be needed for scab control before first cover. Where there is a problem, spray at petal fall and first cover. A dilute spray is necessary for good control.
• Learn more:
  • Notes on Tender Fruit Insects & Diseases
    • Pear scab
    • Fabraea leaf spot

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 7-9. Products Used on Pears.

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