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Current Status of Brown Marmorated Stink Bug, Codling Moth and Oriental Fruit Moth

Posted: August 29, 2011

Our weekly observations revealed very high numbers of brown marmorated stink bug nymphs and adults feeding on soybean and corn plants in the vicinity of fruit orchards. Observations at older soybean plants (i.e., plants with pods and new beans), especially around field borders next to woods, revealed thousands of brown marmorated stink bug late nymphs and adults. Also, available traps and lures utilizing stink bug aggregation pheromone are capturing high numbers of all brown marmorated stink bug stages. Late season generations of codling moth represent a continuous challenge for all our fruit. Due to discrepancies observed between the predictive codling moth egg hatch model and the actual situation in the orchards, we strongly recommend the use of actual observations from an orchard as the main factor in deciding if and/or when the control measures are necessary. The Oriental fruit moth (OFM) continues to injure apple and peach fruit. Some loads of fruit were already rejected by local processors for the presence of live larvae in the fruit.
The insect pest control updates presented below are for the south-central part of Pennsylvania based on observations in Adams County, PA.
  • The brown marmorated stink bug adults (BMSB) and all instar nymphs are present and actively feeding in apple and peach orchards. Our weekly observations revealed very high numbers of BMSB nymphs and adults feeding on soybean and corn plants in the vicinity of fruit orchards. Observations at older soybean plants (i.e., plants with pods and new beans), especially around field borders next to woods, revealed thousands of brown marmorated stink bug late nymphs and adults. Also, available traps and lures utilizing stink bug aggregation pheromone are capturing high numbers of all BMSB stages. As the season will turn into fall, we expect that the movement of BMSB adults and pre-overwintering intensive feeding by BMSB adults from outside hosts into orchards will become the main source of injuries of fruit. While the nymphal feeding can be reduced by effective and well-timed insecticide treatments, the feeding by continuously wandering BMSB adults is very difficult to control. With about 6 to 8 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 close to harvest. The August issue of the Fruit Times Newsletter provides some suggestions for late season stink bug control.
  • The codling moth (CM) third generation moths are still actively flying in most Pennsylvania orchards. These late season generations represent a continuous challenge for all our fruit. Due to discrepancies observed between the predictive CM egg hatch model and the actual situation in the orchards, we strongly recommend the use of actual observations from an orchard as the main factor in deciding if and/or when the control measures are necessary. Applications of Altacor, Belt, Delegate, Tourismo, or Voliam Flexi or Voliam Xpress should provide excellent control of CM.
  • If necessary, it is still a good time to continue to control the second generations of tufted apple bud moth and obliquebanded leafroller. Some insecticides such as Altacor, Belt, or Delegate used for the control of CM or OFM will also provide excellent control of larvae of both leafroller species. Intrepid or B. thuringhiensis based products should provide effective control of the leafroller larvae but will not control internal fruit feeders.
  • The Oriental fruit moth (OFM) continues to injure apple and peach fruit. Some loads of fruit were already rejected by local processors for the presence of live larvae in the fruit. As with the CM, please use the actual local orchard observations (e.g., pheromone trap data and/or fruit injuries from the earlier generation) as the main factor deciding about the necessity for OFM control. Materials listed for the control of CM will also control OFM.
  • 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, spotted tentiform leafminer on April 06 and red banded leafroller on April 5, for obliquebanded leafroller the biofix was established on May 29.