May 20th Weekly Insect Bytes

Posted: May 22, 2011

The insect pest control updates presented here are for the south-central part of Pennsylvania based on observations in Adams County, Pennsylvania. It is important to modify your integrated pest management practices based on scouting of your own orchard blocks.

Current pest status

  • 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. Obliquebanded leafroller adults still are not active.
  • Brown marmorated stinkbug continue to move from overwintering shelters and feed on multiple species of plants, not necessarily inside orchards. The first cover insecticide treatments directed against other pests should at least suppress the portion of BMSB population present in orchards. Unless BMSB is posted actively feeding on fruit trees, no special stink bug control activities are required at this time. Visual monitoring for feeding adults is the only available, reliable monitoring technique at this time of the season.
  • Based in the degree-day model for codling moth egg hatch, sometime late the week of May 23 or during the following week will be the best time to start controlling CM. Applications of Altacor, Belt, Delegate, Tourismo, or Voliam Flexi or Voliam Xpress should provide excellent control of CM. All products listed above will also provide control of tufted apple bud moth larvae. Codling moth granulosis virus (Cyd-X) applied after the beginning of egg hatch should also provide good control of CM neonate larvae.
  • The combination of Oriental fruit moth (very high populations observed in some orchards), plum curculio (quite frequent occurrence in traps placed for monitoring of stink bugs), obliquebanded leafroller and redbanded leafroller can still be controlled at this time by broad-spectrum insecticides (e.g., organo-phosphates; or neonicotinoids (Assail, Calypso); or Avaunt). Older neonicotinoids (Provado, Actara) applied after petal fall will also provide excellent control of aphids and leafminers.
  • Scale insects can still be controlled with a post-bloom application of Esteem or Centaur with an addition of a low rate of oil or application(s) of Movento. The secret to good scale control is good coverage. Growers should use a minimum of 100 gallons per acre or more depending on the size of their trees.
  • The suppression of European red mite populations around bloom time should help to manage mites later during the season. Acaricides such as Acramite, Envidor, Portal, Kanemite, Nexter, or Zeal, although registered mainly for summer mite control, can be considered for mite control at this time of the season.
  • If hand applied mating disruption materials (Isomate or CheckMate) are planned on peaches for the control of codling moth, Oriental fruit moth and borers, they should already be placed in orchards.
  • Pheromone traps for monitoring obliquebanded leafroller should be placed in orchards by now.

Where trade names appear, no discrimination is intended, and no endorsement by the Penn State College of Agricultural Sciences is implied.

Contact Information

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