August 5, AppleTalk Call Summary

AppleTalk Conference Call Summary
Tuesday, August 5th, 2014, 8:00 – 9:00 a.m.
Presenter: John Aue, Threshold IPM.
Moderator: Peter Werts, IPM Institute of North America; questions or comments,

August 5th Call download: Click Here

Post-harvest disease control
Follow-up article by Dave Rosenberger on pre-harvest fungicide applications for preventing storage diseases:

Apple maggot
Apple maggot in home orchards provide an example of the exponential growth of an introduced pest:

Native stink bug minute 6:10
Growers who have had stink bug issues in the past are recommended to examine fruit on the outer edge of the tree for circular depressions or dimples. Stink bug nymphs are in their fourth to fifth instar and will continue to feed on fruit as adults. Typically, populations do not significantly increase at this stage, yet more beetles may move into orchard as wild host, e.g., wild mustard, become unavailable. Historic damage is most likely a result of alternate hosts in or near the orchard.

White apple leafhopper 9:45
Second generation white apple leafhopper (WALH) eggs are beginning to hatch. Scout for white spots or stippling of leaves on the interior of the canopy. If no damage was observed during first generation, a couple weeks ago, it is not likely damage will occur now. With the potential to feed into September WALH can cause a major loss of chlorophyll. If damage is observed control can be easily achieved.

The potential for potato leaf hopper causing serious damage is reduced once the terminals have set. High populations can create honeydew which can result in mold, similar in appearance to fly-speck, before harvest.

Tracking degree days: issues with harvest and pest management 13:15

Click to enlarge image
Click to enlarge image

Pre-harvest interval for late-season sprays 21:40

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Click to enlarge image

Late season codling moth control 40:30
Continue to monitor codling moth traps to determine options for second generation control. If a treatment is warranted, materials such as Altacor and Delegate can be applied within five to seven days before harvest. The three formulations of codling moth granulosis virus can be applied up to the day of harvest and will provide five to seven days of protection.

Additional articles and resources
• Apple maggot. Tree Fruit IPM Advisory. Utah State University. August 1, 2014.
• Managing Post Harvest Diseases. Dave Rosenberger. Scaffolds Fruit Journal. August 4, 2014.