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Weekly Insect Bytes from the Entomology Team

Posted: July 15, 2011

The movement of brown marmorated stink bug summer adults from outside hosts into orchards (or other crops) could now become a significant source of new infestation. Other insect pests to be monitoring are Japanese beetle, codling moth and Oriental fruit moth.
Dr. Greg Krawczyk and Dr. Larry Hull, Penn State Fruit Research and Extension Center Entomologists

The insect pest control updates presented below are for the south-central part of Pennsylvania based on observations in Adams County.

Current pest status

  • This past week we continued to observe brown marmorated stink bug eggs, adults, and all instar nymphs in both stone and pome fruit orchards and in surrounding vegetation. Although the visual monitoring still remains the best monitoring technique, finally the currently available traps and lures utilizing another stink bug (Plautia stali) aggregation pheromone started to capture higher numbers of BMSB nymphs (no BMSB adults in traps as of now). The BMSB adults from the overwintering generation are much less abundant but they are still present and continue to deposit eggs. This past week, we also detected the first summer generation adults, observed mostly in vegetation around orchards. The movement of summer adults from outside hosts into orchards (or other crops) could become a significant source of new infestation. While the nymphal feeding in orchards can be reduced by effective and well-timed insecticide treatments, the feeding by continuously wandering BMSB adults is very difficult to control. The choice of insecticides directed against other pests should control the portion of BMSB population present in orchards. With at least 12 more weeks of the current growing season to go, it is extremely important that growers plan ahead with the choice of products utilized against BMSB, and preserve the most effective options, with the shortest PHI, for applications when the pressure from this pest will increase, especially in the later part of the season. Please see the special BMSB issue of the PSU Fruit Times Newsletter for our most current BMSB management recommendations: http://frec.cas.psu.edu/pdf/StinkBug2011FT.pdf
  • Japanese beetle adults are being observed in many orchards. Neonicotinoid insecticides recommended for the control of aphids or stink bug should provide good control/suppression of this pest.
  • The codling moth (CM) second generation flight started in some orchards. Due to discrepancies observed between the predictive CM egg hatch model and the actual situation in orchards, we strongly recommend use of the actual observations from an orchard as the main factor in deciding if and/or when control measures are necessary. Applications of Altacor, Belt, Delegate, Tourismo, or Voliam Flexi or Voliam Xpress should provide excellent control of CM.
  • From about this time of the season we will see continuous flight of overlapping generations of Oriental fruit moth (OFM). As with CM populations, please use the actual local orchard observations (e.g., pheromone trap data and/or fruit injuries from the earlier generation) as the main factor for deciding about the necessity for OFM control. Materials listed for the control of CM will also control OFM.
  • If control of European red mite is still needed, acaricides such as Acramite, Envidor, Portal, Kanemite, Nexter or Zeal should be considered for mite control at this time of the season.
  • The 2011 season biofix for the Oriental fruit moth was established on April 19, codling moth on May 7, tufted apple bud moth on May 11, obliquebanded leafroller on May 29, spotted tentiform leafminer on April 06 and red banded leafroller on April 5.