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Kentucky Apple Integrated Crop Management Manual
Appendix 3
INSECT SAMPLE ABUNDANCE CLASSES AND ACTION THRESHOLDS, 1993.
| Pest |
Type of Sample |
Few |
Common |
Abundant |
Extreme |
| Codling moth |
Per trap per week |
1-4 |
5* |
6-20 |
21+ |
| Green fruitworm |
Per 100 fruit clusters |
1-9 |
10* |
11-20 |
21+ |
| Early season leafrollers
(April & May) |
Per trap per week |
1-5 |
6-10 |
11-30 |
31+ |
| Per 100 fruit clusters |
1-9 |
10* |
11-20 |
21+ |
| Oriental fruit moth |
Per trap per week |
1-9 |
10 |
11-20 |
21+ |
| Per 100 fruit clusters |
1-3 |
4*-10 |
11-20 |
21+ |
| Plum curculio** |
Per 100 fruit clusters |
0.1-0.9 |
1* |
2-5 |
6+ |
| Leafrollers |
Per 100 leaves |
1-3 |
4-6 |
7-10 |
11+ |
| Rosy apple aphid |
Per 100 fruit clusters |
1-4 |
5* |
6-10 |
11+ |
| San Jose scale |
Per trap per week |
1*-100 |
100-1000 |
1001-3000 |
3000+ |
| Per tape (crawlers) |
0.1-0.9 |
1* |
2-10 |
11+ |
| Tarnished plant bug |
Per 100 fruit clusters |
1-4 |
5* |
6-10 |
11+ |
| Aphids |
Infested terminals / 100
leaf terminals |
1-49 |
50* |
51-70 |
71+ |
| Woolly aphids |
Infestations / 100
pruning scars |
1-49 |
50* |
51-70 |
71+ |
| European red mites and
Twospotted spider
mites |
Per leaf (until Apr 1 or
less than 300 DD)*** |
1-4 |
5* |
6-10 |
11+ |
| Per leaf (until June 1 or
less than 1200 DD)*** |
1-9 |
10* |
11-20 |
21+ |
| Per leaf (after June 1 or
more than 1200 DD)*** |
1-14 |
15* |
16-30 |
31+ |
| White apple leafhopper |
Per leaf |
1-2 |
3* |
4-6 |
7+ |
* Action Threshold
** Use precautionary sprays for plum curculio control at pink and petal fall stages of development.
*** Degree day measurements are more accurate than fixed calendar dates.
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