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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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