Weekly Insect Bytes for July 17, 2015

Posted: July 17, 2015

During this past week we observed first brown marmorated stink bug (BMSB) adults maturing from eggs deposited earlier this season by BMSB adults from the overwintering generation. With the arrival of this generation, we expect an intensified movement of BMSB into orchards and more frequent occurrence of fruit injuries caused by this pest.
Wooly apple aphid colony on apple branch (Photo G. Krawczyk)

Wooly apple aphid colony on apple branch (Photo G. Krawczyk)

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. Phone: 877-268-2020 and Sterling International, Inc. Phone: 509-343-3625). The Rescue lures (from Sterling Int.) can also be purchased from most hardware stores and retailers such as Lowe’s, Home Depot or Wal-Mart.

The list of effective insecticide options includes products only with few modes of action: pyrethroids (IRAC Group 3A) such as Bifenture® EC and 10DF and Brigade® WSB (the same AI, bifenthrin), Danitol® (fenpropathrin), and Warrior® (cyhalothrin); neonicotinoids (IRAC Group 4A) such as Actara® (thiametoxam), Assail® (acetamiprid), Belay ® (clothianidin); and one carbamate product (IRAC Group 1A), Lannate® (methomyl).

The insect pest control updates presented below are for South-central Pennsylvania based on observations in Adams County. To view the insect hatch and trapping data for all major insect pests, please visit the Penn State Fruit Research and Extension Center (FREC) website. For control recommendations, refer to the Insect and Mite Control Toolbox.

Wooly Apple Aphids

It is a good time to re-evaluate your orchards for the presence of wooly apple aphids (WAA). If WAA are observed in the orchard, 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.

Japanese Beetles

Japanese beetles (JB) are still being frequently observed in orchards located around the Pennsylvania. Materials recommended for the control of brown marmorated stink bug should also provide effective control of JB. If the control of BMSB is not necessary, and only JB needs to be controlled, in addition to neonicotinoid insecticides also carbaryl (Sevin®) should provide good control of JB.

Pear Psylla

Pear psylla (PP) populations are 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 Danitol®, or Endigo®, or Centaur® WDG or Delegate® plus adjuvant. Excellent coverage of the inside parts of tree canopy where the still growing shoots provide the best support to pear psylla populations is crucial for the effective PP control.

pear psylla

Codling Moth

The second generation of codling moth (CM) is ready to start (or just started) in most orchards located in southern PA. Unfortunately, we continue to observe the disparity between the CM egg hatch forecasted by SkyBit Inc. and the actual field situation (as observed in FREC orchards). The computer model predicts about 50 percent egg hatch of the second CM generation for July 20th, while the CM trap data collected in our orchards indicates just the beginning of the second CM generation flight. Pheromone traps provide the easiest and the most accurate tool to monitor the actual pest pressure in orchards and the best real word indicator to answer the question “if” and “when” the control is needed.

One of the options to avoid the challenge with the discrepancy between the model and actual trap data is to use mating disruption in the orchard, as this management method will provide continuous season long control of targeted pest(s). If mating disruption materials are not used to control codling moth, applications of Altacor®, Belt®, Delegate®, Tourismo® or Voliam Flexi® or Voliam Xpress® should provide excellent control of CM.

Tufted Apple Bud Moth—Obliquebanded Leafroller

Tufted apple bud moth (TABM) and obliquebanded leafroller (OBLR) populations are still between generations and at this time of the season no TABM or OBLR control is necessary. The flight of the second generation of both species should start within a week and the next best timing to control both leafroller species will occur sometime in late July or early August.

Spotted Wing Drosophila

Based on our experience from the last two seasons, beginning of July is a good time to start searching for the first male adults of spotted wing drosophila (SWD). There are already confirmed SWD findings from Maryland and anecdotal observations on raspberries and late sweet cherries in Pennsylvania. Growers with these crops as well as blueberries should pay very close attention to possible movement of this pest into their plantations. SWD monitoring traps can provide accurate information about the presence of SWD. Traps are also very useful tools to detect possible increases of fruit flies populations and/or their movement into plantations.

Contact Information

Grzegorz (Greg) Krawczyk
  • Extension Tree Fruit Entomologist
Phone: 717-677-6116