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Western N.C. orchard pest populations
Story Date: 7/20/2017
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Source: NCSU EXTENSION, 7/19/17
Codling Moth: Codling moth DD accumulations range from about 1750 in Henderson County to 2125 in Cleveland County, which corresponds to about 40% and 75% completion of second generation egg hatch, respectively. Although second generation populations are generally low in orchards where first generation populations were well controlled, the need for multiple insecticide applications should be based on pheromone trap captures, using a threshold of 5 to 7 moths per trap. In orchards using mating disruption, the need for supplemental insecticides for codling moth should be based on a threshold of an average of 3 cumulative moths over a two-week period.
Oriental Fruit Moth: OFM populations are beginning to increase in several orchards, which is not unusual for this time of the year. In orchards not using mating disruption, they often begin to increase in mid-to-late July, with relatively high populations continuing through September. However, pyrethroid insecticides have provided good control of OFM, so in orchards using pyrethroids for brown marmorated stink bug in August and September, OFM may become less of an issue. One or two applications of sprayable OFM pheromone in late July and late August has worked well for control of late-season OFM.
Brown Marmorated Stink Bug: As indicated in last week’s update, first generation adults are present in lower elevation foothill and piedmont orchards (Cleveland, Lincoln and Burke Counties), so insecticide applications for BMSB should be underway in these areas. Also, first generation emergence is predicted to begin this weekend in the Wilkes County area, so the threat of damage will increase substantially beginning next week. In Henderson County, first emergence of adults is predicted to begin in about 10 days, at which time applications should begin in this area.
Early indications in lower elevation locations are that first generation adult populations appear to be quite high this year. However, the first real heatwave of the year has begun this week, and this may help suppress populations. In previous years we have observed BMSB populations decline in August where temperatures reached the mid 90s or above. Hopefully this response will be a trend and not an anomaly. We’ll continue to monitor BMSB in all locations through September.
For the full report, click here.
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