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Insect Pest Control Update from Greg Krawczyk and Larry Hull

Posted: August 23, 2011

The movement of summer brown marmorated stink bug (BMSB) adults from outside hosts into orchards (or other crops) and associated deposition of new eggs slowly is becoming the most important source of new infestation in orchards. 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 8 more weeks of the current growing season to go (depending on cultivar), 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. The codling moth (CM) second and possibly third generation moths are actively flying in most Pennsylvania orchards. These late season generations represent a continuous challenge for all our fruit. It is still a good time to continue to control the second generations of tufted apple bud moth and obliquebanded leafroller. Although the numbers of Oriental fruit moth (OFM) observed in pheromone traps located at the Penn State Fruit Research and Extension Center continue to remain at a low level, from now on we expect to see a continuous flight of OFM. Similarly as with the CM, please use the actual local orchard observations (e.g., pheromone trap data and/or fruit injuries from earlier generation) as the main factor deciding about the necessity for OFM control.
Photo by Loy Elliott

Photo by Loy Elliott

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, Pennsylvania.

Current pest status

  • The brown marmorated stink bug (BMSB) adults and all instar nymphs are present and actively feeding in both stone and pome fruit orchards and in surrounding vegetation. During our observations this past week we again found 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 hundreds if not thousands of brown marmorated stink bugs. Also, the currently available traps and lures utilizing stink bug aggregation pheromone finally are capturing many BMSB nymphs and adults. The movement of summer adults from outside hosts into orchards (or other crops) and associated deposition of new eggs slowly is becoming the most important source of new BMSB infestation in orchards. 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 8 more weeks of the current growing season to go (depending on cultivar), 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. The most current update on BMSB management suggestions is accessible as a part of the latest issue of the PSU Fruit Times Newsletter at: http://extension.psu.edu/fruit-times
  • The codling moth (CM) second and possibly third generation moths are 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 use of the 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.
  • 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 Oriental fruit moth (OFM) will also provide excellent control of larvae of both leafroller species. Intrepid or B. thuringhiensis based products should provide effective control of leafroller larvae but will not control internal fruit feeders.
  • Although the numbers of Oriental fruit moth (OFM) observed in pheromone traps located at the Penn State Fruit Research and Extension Center continue to remain at a low level, from now on we expect to see a continuous flight of OFM. Similarly as with the CM, please use the actual local orchard observations (e.g., pheromone trap data and/or fruit injuries from 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 6 and red banded leafroller on April 5; for obliquebanded leafroller the biofix was established on May 29.