Source: Jim Walgenbach, NCSU COOPERATIVE EXTENSION, 7/8/19


Codling moth and brown marmorated stink bug remain the insects of concern at this time, with codling moth of greater concern at higher elevations (>2000 ft) and BMSB of greater concern at lower elevations in the piedmont.

Codling Moth:  In elevations >2000 ft (e.g., Henderson County) codling moth degree-day accumulations are about 1500, which coincides with about 15% egg hatch of the second generation. This generation will remain a potential threat for possibly two more weeks, although overall populations have been very low.

In Cleveland County (elevation of about 840 ft), codling moth DD accumulations average about 1920, which coincides with 68% egg hatch of the second generation. Second generation flight is predicted to be complete in another 10 days or so.

Brown Marmorated Stink Bug:  In Cleveland County, a total of 610 BMSB DD have accumulated since the first egg hatch in early May. Second generation adults were predicted to begin emerging on July 5, and the increase in pheromone trap captures in Cleveland County this past week (mean of 6.6 versus 2.6 last week) indicates that first generation adult emergence is underway in the piedmont. This is an important time for BMSB control in lower elevation orchards.

In Henderson County, first generation adults have not yet emerged, with DD accumulations only at 431. The fact that pheromone trap captures have not changed from last week (mean capture still is less than 1 bug per trap) further indicates adult emergence has not yet begun. Based on weather forecasts, emergence (i.e., 540 DD accumulations) is predicted to begin on July 20, so protection against BMSB will be most important beginning the week of July 21.

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