WNC Orchard Insect Populations for May 8, 2018
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Collapse ▲May 8, 2018
Biofix dates now have been set for the three key lepidopteran pests of apples in the Hendersonville area. Biofix dates are 2 April for oriental fruit moth, 30 April for codling moth, and 4 May for tufted apple bud moth. Although we have not captured moths in lower elevation orchards in Polk or Cleveland Counties, historically biofix occurs about 6 days earlier in these locations.
In Henderson County, oriental fruit moth trap captures have declined considerably during the past two weeks and the overwintering generation is dying out. Insecticides applied at petal fall, or mating disruption if using it, should have controlled OFM at this time.
Based on the 30 April biofix date for codling moth, 93 DD have accumulated, so the timing of the initial application for first-generation codling moth in Henderson County is predicted for 7 to 10 days. In orchards using mating disruption, insecticides targeting codling moth are not recommended until early to mid June, which will coincide with the timing needed for tufted apple bud moth.
In lower elevation orchards not using mating disruption, an insecticide targeting coding moth is recommended at this time if they have been captured in pheromone traps. If none have been captured, it is OK to delay this application for at least another 10 days.
Insecticides targeting plum curculio should have already been applied to most varieties. If an insecticide effective against this pest has not yet been made on late blooming cultivars, this should be done at soon as trees are free of pollinators.
Finally, for those who are targeting San Jose scale with post-bloom insecticide applications (Esteem, Centaur or Movento), there remains about a 2-week window of opportunity to apply these treatments and still obtain good control.
Learn more about southeastern apple insect pests at the Apple Insect Management page.
2018 Average Weekly Trap Captures*
HENDERSON COUNTY | |||
Insects per trap | |||
Apr 23 |
Apr 30 |
May 7 |
|
Codling Moth | 0.0 | 0.5 | 4.5 |
Oriental Fruit Moth | 90.0 | 38.0 | 16.0 |
Tufted Apple Bud Moth | 0.0 | 0.0 | 13.0 |
Redbanded Leafroller | 2.0 | 1.0 | 0.0 |
Obliquebanded Leafroller | 0.0 | 0.0 | 0.0 |
Lesser Appleworm | 0.0 | 0.0 | 0.0 |
Apple Maggot | – | – | – |
Brown Marmorated Stink Bug (commercial – mountains) | 0.0 | 0.0 | 0.0 |
Brown Marmorated Stink Bug (commercial – upper piedmont) | 0.3 | 1.3 | 1.3 |
Brown Marmorated Stink Bug (research – unsprayed) | 0.3 | 0.3 | 2.3 |
Spotted Tentiform Leafminer | 0.0 | 0.0 | 0.0 |
Dogwood Borer | – | 0.0 | 0.0 |
Peachtree Borer | 0.0 | 0.0 | 1.0 |
Lesser Peachtree Borer | 0.0 | 13.0 | 139.0 |
San Jose Scale | 0.0 | 0.0 | 0.0 |
*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.
2018 Accumulated Degree Days
Henderson County | ||||
Biofix | Apr 23 |
Apr 30 |
May 8 |
|
Codling Moth | Apr 30 | – | – | 93 |
Oriental Fruit Moth | Apr 2 | 171 | 247 | 372 |
Tufted Apple Bud Moth | May 4 | – | – | 52 |
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:
|