Growing Season Updates
Weekly Insect Bytes
The insect pest control updates presented below are for the south-central part of Pennsylvania based on observation in Adams County, PA.
Current pest status:
The third generation of Oriental fruit moth (OFM) and the second generation of codling moth are active in most orchards in south-central PA. We are observing increased numbers of captured adult moths in sex pheromone traps located at various sites. If mating disruption materials were not used to control oriental fruit moth and/or codling moth, applications of Altacor®, Belt®, Delegate®, Tourismo® or Voliam Flexi® or Voliam Xpress® should provide excellent control of OFM and CM.
In addition to all juvenile stages of brown marmorated stink bug (BMSB) observed earlier this season, recently we are also encountering first summer generation BMSB adults on various plants surrounding commercial orchards. This past week, we also detected the presence of first BMSB adults and nymphs on older soybean plants. For the next few weeks we will have both the overwintering adults and the young summer BMSB adults present in orchards at the same time. While in most orchards the BMSB numbers are still very low, at some locations we spotted first fruit injuries caused by this pest. The list of effective insecticides options is limited and includes products only with few distinctive modes of action: pyrethroids (IRAC Group 3A): Bifenture and Brigade (only WSB formulation) (the same AI, bifenthrin), Danitol (fenpropathrin), and Warrior (cyhalothrin); neonicotinoids (IRAC Group 4A): Actara (thiametoxam), Assail (acetamiprid), Belay (clothianidin), Scorpion and Venom (the same AI, dinotefuran); one carbamate product (IRAC Group 1A), Lannate (methomyl) and some products including combinations of two different insecticide chemistries such as in Endigo or Leverage. While trying to limit the impact of BMSB on fruit, please remember about seasonal limits for the number of insecticide applications per season.
Japanese beetle (JB) and June beetle populations need to still be controlled in some orchards. Neonicotinoid insecticides such as Assail, Calypso, and Admire Plus are very effective against both pests and additionally, they should also provide at least some control of aphids and brown marmorated stink bug.
If wooly apple aphids are observed in the orchard (s), application(s) of Movento or Diazinon should provide effective control of this pest. Movento is translaminar within plants and provides good systemic activity against live WAA but for the maximum efficacy of this product, an addition of surfactant is required.
Pear psylla populations are still present in many local pear orchards. While additional applications of Surround may not be too practical, the still present nymphs and adults of this pest can be controlled by treatments of Endigo or Centaur WDG or Movento or Portal or Delegate plus adjuvant. Excellent coverage of the inside part of tree canopy where the still growing shoots provide the best support to pear psylla populations is crucial for the effective PP control.
Tufted apple bud moth and obliqubanded leafroller populations just started second generations. However, it is still too early to control these pests. The best time to control both leafroller species will occur in early August.
Traps baited with commercially available BMSB lures are effective in detecting and capturing most stages of BMSB present in orchards. Commercial BMSB lures and traps are available from Ag-Bio Inc. (http://www.agbio-inc.com/dead-inn-pyramid-trap.html, Phone: 877-268-2020) and Sterling International, Inc. (http://www.rescue.com/product/reusable-outdoor-stink-bug-trap, Phone: 509-343-3625).
In the Biglerville area (FREC orchards) the 2014 season biofix for spotted tentiform leafminer was established on April 17th, Oriental fruit moth on April 23rd; codling moth on May 9th, tufted apple bud moth on May 12th, and obliquebanded leafroller on May 29th.
Prepared by Dr. Greg Krawczyk, PSU Department of Entomology, Fruit Research and Extension Center, Biglerville, PA.
Weekly update information on trap counts for Codling Moth, Obliquebanded Leafroller, Oriental Fruit Moth, Redbanded Leafroller, Spotted Tentiform Leafminer, and Tufted Apple Bud Moth.
Weekly egg hatch models for Apple Maggot, Codling Moth, Obliquebanded Leafroller, Oriental Fruit Moth, Spotted Tentiform Leafminer, and Tufted Apple Bud Moth.
- Fact sheet on Apple Scab
- Fact sheet on Cedar Apple Rust
- Fact sheet on Cherry Leaf Spot
- Fact sheet on Fire Blight
- Fact sheet on Sooty Blotch and Flyspeck of Apple
Carbohydrate Model for Precision Crop Load Management
To adapt the carbohydrate models for your own orchard site:
- Visit the NEWA website
- Go to the pull down menu under Crop Management and highlight Apple Carbohydrate Thinning
- Click on the leaf on the map closest to your site
- Click continue
- Enter your Green Tip Date and Full Bloom Date then hit the green Calculate button
Special Notes for Tables
- Values beginning with June 6, 2014 and thereafter are estimated based upon weather forecasts. If weather conditions change from what was predicted then you should take this into consideration.
- The 4 Day Average Balance values are derived from the current day Balance and the next 3 days to account for how the trees may respond based on predicted weather.
- The model is only as good as the predicted weather forecast. If the weather changes dramatically from the forecast recheck the model.
- Bud break and bloom dates are from grower evaluations of their orchards.