Regional Information

Site Specific Monitoring

• Site specific intensive monitoring required - no regional patterns
• Orchard history is important
• Identify source of migrants eg. wild hosts
• Apricots, cherries and plums are good indicators on borders of orchard
• A pest of rising importance
• Traps available but not particularly reliable

Monitoring Techniques Thresholds

• Fruit examination along outside 2-3 rows of block next wild hosts and bush areas
• If injury at abandoned sites, expect migration into orchards in 3-5 days
• Characteristic cresent shaped egg laying scar.
• Threshold: any new damage to fruit
• Monitoring 5-7 days after insecticide application can help determine need for reapplication of controls
• Harvest assessment
  

Additional Notes

• Warm temperature (above 16 °C) following a rain is ideal for emergence around shuck fall period
• Expect emergence if mean temperature is 13-16 °C for 3 to 4 days, mean above 16 °C for 3 days, or if over 24 °C for 2 consecutive days.
• Adults typically emerge over a 3-4 week period beginning just after bloom. Egg laying and fruit injury begins within 2 weeks after emergence.
• Emergence can be prolonged to 4-6 weeks.

Commonly Used Control Options

• Guthion or APM or Sniper border spray
• Control is more critical on apricot, plums, nectarines & cherries
• First generation OFM spray often falls within PC activity period but is unlikely to provide sufficient control in problem sites.
• Damage potential may increase if mating disruption for OFM used; monitoring is essential.

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