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May 13th Weekly Insect Bytes

Posted: May 14, 2011

Dr. Greg Krawczyk and Dr. Larry Hull, entomologists at the Penn State Fruit Research and Extension Center in Biglerville, will be posting insect pest control updates, or "Insect Bytes" each Friday. The updates are based on observations in Adams County, Pennsylvania, and it is important to adjust the recommendations for your specific orchard conditions.
Codling moth

Codling moth

Current pest status

  • The 2011 season biofix for 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 are still not active.
  • Brown marmorated stinkbug is moving from overwintering shelters and feeding on multiple species of plants, not necessarily inside orchards. The petal fall and first cover insecticide treatments directed against other pests will suppress the portion of BMSB population present in orchards. No special stinkbug control activities are required at this time. Visual monitoring for feeding adults is the only reliable monitoring technique at this time of the season.
  • The combination of Oriental fruit moth (very high populations observed in some orchards, about 50 percent egg hatch as of May 13), plum curculio (quite frequent occurrence in traps placed for monitoring of stink bugs), European apple sawfly, 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.
  • It is still a good time to control scale insects 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 GPA 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. Agri-Mek with a penetrant (i.e., oil) applied at petal fall, in most cases offers excellent control of ERM and spotted tentiform leafminer, and fair to good control of white apple leafhopper. Agri-Mek should be applied before the leaves harden off, within about 10 days of petal fall. Other acaricides such as Acramite, Envidor, Portal, Kanemite, Nexter, or Zeal, although registered mainly for summer mite control, can also be considered for mite control at this time of the season. The ovicidal acaricides - Apollo, Onager (Savey) - can be applied during the petal fall to first cover period.
  • If hand applied mating disruption materials (Isomate or CheckMate) are planned for the control of codling moth and/or Oriental fruit moth, the dispensers should be placed in the orchard during the bloom of apples.
  • Pheromone traps for monitoring codling moth and tufted apple bud moth should be placed in the orchards by now. Traps for monitoring obliquebanded leafroller should be placed in the orchards about 2 to 3 weeks after petal fall.

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