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:
Moderate temperatures observed so far this month extended the flights of the second generation of tufted apple bud moth and obliquebanded leafroller. Colder than usual weather also stretched the traditional periods when the control of these two pests may be needed. As of Aug 22nd, the predictive insect developmental models provided by SkyBit estimated the TABM egg hatch at 48 percent and OBLR at 60 percent. This past week we observed significant increase of TABM moths collected in traps located in the PSU FREC orchards. The captures of codling moth and Oriental fruit moth adults appears to be on the decline, however, the third generation of CM and the fourth generations of OFM are likely to still be present in the orchards during September. Only site specific monitoring of each individual pest will provide accurate information if and for how long control treatments are necessary. Please use the on-site monitoring as the main indicator in deciding if and when the pesticide application is necessary. Applications of Altacor® (5d PHI on pome and 10d PHI on stone fruit), Belt® (14d PHI on pome, 7d PHI on stone fruit), Delegate® (7d PHI on pome fruit, 7d PHI on plums, 1d PHI on peach and nectarines), Tourismo® (14d PHI on pome and stone fruit) Voliam Flexi® (35d PHI on pome and 14d PHI on stone fruit) or Voliam Xpress® (21d PHI on pome and 14d PHI on stone fruit) should provide excellent control of CM, OFM, TABM and/or OBLR larvae. Both Voliam products will also provide some control/ suppression of brown marmorated stink bug.
All stages of brown marmorated stink bug (BMSB) are being observed in and outside of orchards with some locations already reporting BMSB injured fruit. If soybean or corn are planted around orchards, the edges of the fields provide an excellent area for visual observations. Although not every soybean field is infested by BMSB, during last week observations we recorded big increase in numbers of BMSB nymphs observed on these two crops and edges of woods. The number of collected BMSB nymphs in traps located either on the edge of woods or in the first row of orchard increased over ten folds (10x) during last week observations. The list of effective insecticides options is limited and includes products only with few distinctive modes of action: pyrethroids (IRAC Group 3A): Bifenture (14d PHI) and Brigade (14d PHI) (only WSB formulation, Danitol (14d PHI on pome, 3d PHI on stone fruit), and Warrior (21d PHI on pome, 14d PHI on stone fruit); neonicotinoids (IRAC Group 4A): Actara (35d PHI on pome, 14d PHI on stone fruit)), Assail (7d PHI), Scorpion and Venon (3d PHI); one carbamate product (IRAC Group 1A), Lannate (14d PHI on apple, 4d PHI on peach), and some products including combinations of two different insecticide chemistries such as in Endigo (35d PHI on pome and 14d PHI on stone fruit) or Leverage (7d PHI). While trying to limit the impact of BMSB on fruit, please remember also about seasonal limits for the number of insecticide applications per season.
Commercially available BMSB traps baited with BMSB lures are very effective in detecting and capturing all mobile stages of BMSB present in orchards. For the best results BMSB traps should be placed in the orchard rows bordering possible source of migrating stink bugs such as woods, soybean or corn. As effective as the traps are in detecting migrating BMSB, they will not provide control of the bugs and should be treated only as an “early detection system”. 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).
As the season progress and the trees become bigger, often the volume of used water per acre should be adjusted (increased). Even the most efficacious pest management products will not work if the spray coverage is not sufficient.
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.