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Fruits
Volume 57 Number 8 Date 05/30/2012 APPLE MAGGOT - Degree day accumulations in south-central, southwest and west-central Wisconsin will be appropriate for fly emergence by June 5. Red sphere and yellow sticky traps should be placed at this time to detect the earliest adults. The treatment threshold remains at five flies per trap per week for traps enhanced with an ammonia lure and one fly per trap per week for unenhanced traps. OBLIQUEBANDED LEAFROLLER - The first flight of moths continued for the sixth week and is expected to persist through early June. Apple growers who have experienced late-season OBLR problems in recent years should consider setting additional traps now to determine where to concentrate sampling efforts. In addition, monitoring the second brood now appearing in terminals will also indicate the potential for problems in August. CODLING MOTH - Most apple orchards are 250 or more degree days (base 50°F) beyond the first biofix and treatments for first generation larvae have been applied. Larvicides or other controls should be maintained to prevent problems by the current and subsequent summer generations. Apple growers are reminded that pheromone lures degrade rapidly at warm temperatures and should be replaced every 3-4 weeks. ROSE CHAFER- This beetle has been observed on perennials and in home gardens in the past week. The adults deposit eggs in the soil which hatch into grubs that feed on the roots of grasses, weeds and garden plants. Defoliation is expected to increase in the next 3-4 weeks, especially in areas of the state with sandy soils. --Krista Hamilton, DATCP Entomologist 
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