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Kentucky Apple Integrated Crop Management Manual


Appendix 4

DATES FOR PHEROMONE TRAP PLACEMENT* 

	
		Codling Moth			April 1

		Fruit Tree Leafroller		May 1

		Oblique Banded Leafroller	March 1

		Oriental Fruit Moth		March 1

		Red Banded Leafroller		March 1

		San Jose Scale			April 1
*These dates should provide 2 - 4 weeks lead time to first capture anywhere in Kentucky. It is important to know when first capture occurs.

Codling Moth
The biofix for the codling moth is the starting date of the first sustained flight of male moths captured in pheromone traps. Generally, this is when the fifth moth has been captured in the trap. A few moths often emerge very early in the spring ahead of the rest. Using the fifth moth as the biofix better represents when the majority of the codling moths begin to emerge. This usually occurs just after petal fall. Codling moth traps need to be examined daily in order to know exactly when the biofix occurs. After the biofix has occurred, degree days are calculated on a daily basis and a running total is kept. The codling moth has a 50oF threshold temperature. These degree day accumulations are compared with the target values in the following table.

DD targets and actions to be taken

250Egg hatch begins. An insecticide application is recommended. If codling moth populations are abundant (See Appendix 3), a second application may be necessary 7 to 10 days later.
1000 About when 1st generation moths begin to fly. Use their emergence as the next.
1300 About when 2nd generation egg hatch begins. An insecticide application is recommended. If codling moth populations are abundant, a second application may be necessary 7 to 10 days later.


San Jose Scale
The biofix for the San Jose scale is the capture of males in pheromone traps (See Appendix 2). Male flight usually occurs after petal fall. After the biofix has occurred, degree days are calculated on a daily basis and a running total kept. The San Jose scale has a 51oF threshold temperature. These degree day accumulations are compared with the target values in the following table.

DD targets and actions to be taken
300 Place a piece of black tape, with sticky side out on an infested scaffold limb. Begin examining tape at least twice weekly for minute scale crawlers.
380-400 Crawler emergence should begin.
600-700 Crawler movement is at a maximum. This is the optimal time for an insecticide application.


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