Current Western NC Orchard Pest Populations, August 3 2015
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Collapse ▲We track local insect populations throughout the growing season using a system of traps, temperature-recording devices, and degree-day models. Traps and weather data are checked weekly, with results updated by Tuesday afternoon from April through September. Learn more about southeastern apple pests at the Apple Pest Management page.
Weekly summary
AUGUST 3, 2015
Codling moth: Surprisingly, pheromone trap captures increased in a couple of areas where spray programs have been minimal. Based on degree-day accumulations (average of about 2000 in Henderson County), these probably represent later-emerging individuals of the second generation. It should be noted, however, that trap captures remain very low – essentially zero – in the majority of managed orchards.
Oriental Fruit Moth: OFM pheromone trap captures have been somewhat lower than expected in recent weeks, although numbers have been trending higher during the past month. In orchards not using mating disruption, a preventive application of sprayable pheromone may be warranted if pheromone trap captures have exceeded about 5 moths per trap.
Although we are monitoring in only a few orchards where mating disruption for codling moth and OFM is being used, trap captures at these sites have been extremely low, and insecticides for either of these pests have not been necessary for most of the season.
Apple Maggot: Trap captures in an abandoned orchard increased to 8 flies during the past week. This is the first significant capture this season, but it still represents a relatively low population. The dry weather conditions have not been conducive to emergence of flies from the soil. The need for apple maggot sprays is probably most important in orchards adjacent to abandoned sites.
Brown Marmorated Stink Bug: Stink bug populations remain highest in the piedmont production areas, but numbers seemed to have leveled off during the past few weeks. First generation adults that emerged before August 1 will continue to lay eggs for several weeks, but egg laying should begin to decline within the next one to two weeks. Overall, numbers seem to be fairly low in most Henderson County orchards.
Average Weekly Trap Captures*
HENDERSON COUNTY | |||
Insects per trap | |||
July 20 |
July 27 |
Aug 3 |
|
Codling Moth |
4.7 | 9.0 | 13.7 |
Oriental Fruit Moth |
5.3 | 5.3 | 7.0 |
Tufted Apple Bud Moth | 1.5 | 2.0 | 3.5 |
Redbanded Leafroller | 0.0 | 0.0 | 2.5 |
Obliquebanded Leafroller | 0.5 | 0.5 | 2.0 |
Lesser Appleworm | 2.0 | 0.0 | 2.0 |
Apple Maggot | 2.0 | 0.5 | 4.0 |
Brown Marmorated Stink Bug | 0.3 | 0.0 | 0.0 |
Spotted Tentiform Leafminer | 0.0 | 0.0 | 18.0 |
Dogwood Borer | 48.0 | 26.0 | 40.0 |
Peachtree Borer | 47.5 | 41.0 | 52.0 |
Lesser Peachtree Borer | 21.0 | 7.0 | 25.0 |
San Jose Scale | 1697.5 | 2015.0 | 367.5 |
*Note that averages presented here are intended only to illustrate the timing of insect emergence and fluctuations in population activity, and not as general indicators of population levels. Some orchards included in these averages have significantly higher or lower populations than most commercial orchards in the area, resulting in averages that are sometimes skewed from what is typical. The only way to have an accurate assessment of an individual orchard’s populations is to set up traps in that orchard.
Accumulated Degree Days
Henderson County | ||||
Biofix | July 20 |
July 27 |
Aug 3 |
|
Codling Moth | April 23 | 1662 | 1840 | 2014 |
Oriental Fruit Moth | Apr 6 | 2315 | 2518 | 2734 |
Tufted Apple Bud Moth | April 23 | 2055 | 2258 | 2474 |
About degree-day models:The degree day (DD) models predict adult emergence and egg hatch of each generation. They do not predict the intensity of populations, which can be assessed by using pheromone traps. Hence, the models should be used to help gauge the time period when control is most likely needed, and pheromone traps provide information on the need for and frequency of insecticide applications. For full details, read “IPM Practices for Selected Pests” in the Orchard Management Guide. |
CODLING MOTH:
|
ORIENTAL FRUIT MOTH:
|
TUFTED APPLE BUD MOTH:
|