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Fruits
Volume 58 Number 7 Date 06/13/2013 CODLING MOTH - Large flights were registered for the second week, with nine of the 29 monitoring locations registering economic counts of five or more moths per trap. The weekly high count of 81 male codling moths was documented near Beldenville in Pierce County. Egg deposition has accelerated and a strong potential exists for damaging populations if treatments are not applied on time. Apple orchards that established the biofix from May 19-22 are approaching the 250 degree day point at which a larvicide should be applied. SPOTTED TENTIFORM LEAFMINER - Moth counts were again very low in the last week and ranged from just 2-120 per trap, with an average of 15 per trap. These low counts signal most apple orchards are in between flights and populations consist primarily of late-instar tissue feeder larvae. Counts are expected to increase abruptly in 1-2 weeks as the second flight begins. The economic threshold for STLM increases from 0.1 to 1.0 mine per leaf for the second generation of sapfeeder larvae. REDBANDED LEAFROLLER - Counts of this pest also remained fairly low during the last reporting period. The first flight peaked several weeks ago and relatively few moths have been collected in the interim. The second flight should start at most orchard locations by late June. Apple growers are reminded to replace pheromone lures for both RBLR and STLM in anticipation of the second flights. OBLIQUEBANDED LEAFROLLER - The spring flight began between June 6 and 12 with the capture of moths as far north as Edgar in Marathon County. Late-instar larvae and rolled leaves are still evident at many sites, indicating that moths should continue to emerge over the course of several weeks. The recommended scouting procedure for OBLR is to begin checking terminals for small larvae 7-10 days after the first moths are captured. Although there is no direct correlation between trap counts and larval populations, scouting is imperative since orchards that register even low counts (< 5 moths per trap) can develop significant larval problems a few weeks after a flight has occurred. -- Krista Hamilton, DATCP Entomologist 
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