Plant & Pest Advisory» All Fruit Articles


Peach IPM Report - April 24, 2012

  • Oriental Fruit Moth
  • Tarnished Plant Bugs & Stink Bugs
  • Brown Marmorated Stink Bug
  • Plum Curculio
  • Green Peach Aphid
  • Bacterial Spot
  • Lesser Peachtree Borer
Dean Polk, Fruit IPM Agent and
David Schmitt, Eugene Rizio and Atanas Atanassov,
Program Associates, Tree Fruit IPM

See Scouting Calendar and Trap Counts

Oriental Fruit Moth (OFM): According to the Skybit degree day accumulations, spray dates for the first generation are as follows:

County / Region 1st Spray Date 2nd Spray Date
Gloucester – Southern past 4/26
Monmouth – Central 4/17-19 About 5/3-8
Hunterdon - Northern 4/23-27

All of the first timed treatments should have been applied in southern and central counties. Treatments in northern counties are due this week. Growers in Northern Counties may be seeing trap counts increase. This is a normal occurrence in the emergence pattern just before the first insecticides are applied. We do not use a treatment threshold for the first flight. Sprays are timed by the degree day model in coordination with the first sustained trap captures as seen in the pheromone traps. After two full degree day timed insecticides are applied, then an action threshold of 6-8 moths per trap may be used for the remainder of the flight. Under normal conditions, trap captures should ‘bottom out’ 10 days to 2 weeks after the second application.

Tarnished Plant Bugs (TPB) and Stink Bugs (SB): Native stinkbugs have been active near wood lines. TPB adults and nymphs can usually be found in weedy groundcovers by now. If catfacing insects are present then insecticides effective for those insects should be included in the tank, but groundcover should be managed to minimize TPB and SB populations. Clover and other weedy groundcovers are an invitation for catfacing injury, and therefore require increased insecticide use.

Brown Marmorated Stink Bug (BMSB): Growers have observed BMSB in orchards at low levels while string thinning in Southern Counties. Injured fruit at this point will most likely abort. In 2011 the first injury was observed about mid to late May.

Plum Curculio (PC): Adults are active and fresh injury was first found on 4/23. Although activity should peak in early to mid-May, it usually does not end until sometime in June. See last week’s newsletter for a summary of materials, or the Tree Fruit Production Guide.

Green Peach Aphid (GPA): Most orchard blocks have populations that are still below treatable levels. A few blocks have high populations near woodlines. At this time of year, tolerate no more than 2-3 colonies per tree, or 1 colony per tree in nectarines, or if the trees are in their 1st or 2nd year.

Bacterial Spot: Fruit at this stage is very susceptible to bacterial spot. Favorable conditions for epidemics include persistent winds along with heavy rains or long periods of moisture or humidity. This is an important time for control. Coppers or Terramycin should be applied anytime wet and windy weather is expected. Special Warning on Phytotoxicity: Be very careful when tank mixing Captan and coppers. Captan/copper combinations should be avoided after long periods of overcast skies, since we have previously experienced moderate to severe phytoxicity following several days of cloudy weather. Also be careful with buffering solutions in tank mixes.

Lesser Peachtree Borer (LPTB): Adults should start flying soon. Growers who wish to employ mating disruption for lesser borer control should begin placing dispensers in orchards during the next week or two.