76 



CIRCULAR 2 7 0, U. S. DEPARTMENT OF AGRICULTURE 



be necessary to remove them at intervals to destroy the larvae that 

 crawl into them (fig. 82). Bands are also valuable to prevent climb- 

 ing cutworms from 

 getting into the trees. 

 Their use for this 

 purpose is explained 

 on page 33. 



BAITS AND 

 LIGHTS 



Poisoned baits 

 may be used for com- 

 bating cutworms, as 

 explained on page 34. 

 Attractive baits, 

 composed of about 

 1 part of good mo- 

 lasses to 10 or 15 

 parts of water, are 

 very useful for indi- 

 cating the presence 

 of codling moths in 

 the orchard. For 

 tins purpose the bait 

 should be placed in 

 a suitable container, 

 such as a small kettle 

 with a bail, sus- 

 pended near the top 

 of a tree from a pole 

 by means of a cord 

 and pulley, so that 

 it may be lowered 

 for examination (fig. 

 83). g The level of the 

 liquid should be 

 maintained by add- 

 ing water, and the 

 whole contents 

 should be replaced every 10 days or 2 weeks. In cool weather a small 

 quantity of yeast should be added, as the bait is more attractive 

 when fermenting. Four or five of these baits scattered about an 

 orchard are sufficient. They should be examined daily and the 

 number of codling moths caught should be recorded. These baits 

 catch large numbers of moths, but it has not been demonstrated that 

 they are worth their cost for actual control, although they are very 

 valuable in determining when to spray. Lights are attractive to 

 some insects, but, with the possible exception of the codling moth, 

 no orchard insect in the Pacific Northwest is attracted in sufficient 

 numbers to warrant the use of lights. It has not yet been proved 

 whether they can be used economically as a control for the codling 

 moth . 



Figure 82. — Chemically treated band on apple tree. 



