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Fruits
Volume 65 Number 15 Date 08/13/2020 BROWN MARMORATED STINK BUG - Adults have been captured on survey traps in Dane, Fond du Lac, Racine and Walworth counties in the past 3-4 weeks, signaling the potential for fruit injury in apple orchards prior to harvest. Late-summer populations are increasing in areas of the state where BMSB is established, and it will be important for fruit and vegetable growers to remain alert for stink bug activity through October. OBLIQUEBANDED LEAFROLLER - DATCP cooperators are reminded to maintain pheromone traps for this insect well into September. Second-generation larvae occasionally cause severe fruit damage late in the growing season and moth counts in late August and September can be a predictor of damage potential of the overwintered larval population next spring. CODLING MOTH - Moderate to high counts were reported from nine of 24 cooperating orchard locations in the past week. The largest captures of 16-17 moths per trap were in Marathon and Oneida counties. Approximately 90% of second-flight adults will have emerged once 1,700 degree days (modified base 50°F) have accumulated from the first biofix, and pheromone trap checks may be discontinued at the end of the month. APPLE MAGGOT - Peak emergence of flies has occurred across southern and central Wisconsin and activity is generally decreasing, with a few exceptions. The external depressions and brown, internal larval tunnels indicative of AM infestation are beginning to appear on apples in orchards where AM flies have been more abundant since mid-July. Growers should continue to monitor AM traps through the first week of September. SPOTTED TENTIFORM LEAFMINER - The third and last flight of the season continued this week, with counts ranging widely from 10-625 moths at 24 monitoring locations. Most orchards registered lower weekly captures of fewer than 150 moths. Moth activity is expected to subside by mid-September. -- Krista Hamilton, DATCP Entomologist 
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