WNC Orchard Pest Populations – April 15, 2024
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Collapse ▲April 15, 2024
Petal Fall Sprays – Have Patience until Bloom Subsides
With a heavy bloom throughout the region, apples vary from full bloom to the petal fall stage. With virtually every orchard containing multiple cultivars, this complicates the timing of petal fall sprays, because both honey bees and wild bees likely will be foraging in the vicinity of drift when spraying. Unfortunately insecticides recommended for key pests at petal fall are highly toxic to bees, so insecticide sprays should be delayed until:
1) >80% petals have dropped
2) bees are not flying in orchards susceptible to drift
3) bees have been removed from orchards
Be sure to check labels on precautions to avoid bee kills, because the wording varies among products.
Relative Efficacy of Insecticides for Petal Fall
( ─ no activity, 1 = least effective, 5 = most effective)
Insecticide (activeingredient |
Plum Curculio |
Oriental Fruit Moth |
Rosy Apple Aphid |
Toxicity to Bees |
| Actara (thiamethoxam) | 5 | 2 | 5 | Highly Toxic |
| Assail (acetamiprid) | 3 | 4 | 5 | Moderately Toxic |
| Belay (chlothianidin) | 4 | 3 | 5 | Highly Toxic |
| Avaunt (Indoxacarb) | 4 | 4 | ─ | Highly Toxic |
| Imidan (phosmet) | 4 | 4 | ─ | Highly Toxic |
| Verdepryn (cyclaniliprole) | 4 | 5 | ─ | Highly Toxic |
| Sevin (carbaryl) | 3 | 3 | ─ | Highly Toxic |
| Voliam Flexi (thiamethoxam + chlorantraniliprole) |
5 | 5 | 5 | Highly Toxic |
Learn more about southeastern apple insect pests at the Apple Insect Management page.
2024 Average Weekly Trap Captures
| HENDERSON COUNTY | |||
| Insects per trap | |||
| Apr 1 | Apr 8 | Apr 15 | |
| Codling moth | setup | 0.0 | 0.5 |
| Oriental fruit moth | 100.0 | 108.5 | 103.0 |
| Tufted apple bud moth | setup | 0.0 | 2.0 |
| Redbanded leafroller | 1.0 | 2.0 | 2.0 |
| Obliquebanded leafroller | – | setup | 0.0 |
| Lesser appleworm | – | setup | 0.0 |
| Apple maggot (abandoned and research orchards) | – | – | – |
| Brown marmorated stink bug (commercial) | – | setup | 1.0 |
| Brown marmorated stink bug (unsprayed) | – | setup | 0.0 |
| Spotted tentiform leafminer | 0.0 | 2.0 | 2.0 |
| Dogwood borer | setup | 0.0 | 0.0 |
| Peachtree borer | setup | 0.0 | 0.0 |
| Lesser peachtree borer | setup | 0.0 | 3.0 |
| San Jose scale | setup | 0.0 | 0.0 |
*Note that these averages illustrate only the timing of insect emergence and fluctuations in populations, and are not representative of population levels in any given orchard. The only way to have an accurate assessment of an individual orchard’s populations is to set up traps in that orchard.
2024 Accumulated Degree Days
| HENDERSON COUNTY | ||||
| Apr 1 | Apr 8 | Apr 15 | ||
| Codling moth (Biofix: TBD) | – | – | – | |
| Oriental fruit moth (Biofix: March 15) | 137 | 188 | 288 | |
| Tufted apple bud moth (Biofix: TBD) | – | – | – | |
2024 Pest Population Trends
