SCRAPING AND BANDING FOR CODLING MOTH CONTROL 17 



blade, which is used to gouge into cracks too narrow for the scraper 

 (fig. 4, B). 



Banding 



By the middle of June, or just before the first worms leave the fruit, 

 scraping should be followed by banding, using corrugated-paper bands 

 treated with beta-naphthol. These should contain a minimum of 2 

 pounds of chemical to each 100 linear feet of 2-inch band. They 

 should be prepared by using 1 pound of beta-naphthol to iy 2 pints of 

 heavy oil. In sections of the country where there is much more sum- 

 mer rain than in Yakima County, a larger dosage of 2 pounds per 

 100 linear feet should be used (Baker 1). Chemically treated beta- 

 naphthol bands may be obtained commercially in most sections of the 

 country. When properly prepared and used they have consistently 

 given practically 100 percent kill of all larvae entering them in the 

 Yakima and Wenatchee districts. The bands should be placed around 



Figure 4. — Tools used in scraping apple trees: A, Tree scraper; B, gouge for 

 cleaning out narrow cracks and crotches. 



the trunks, well up near the forking of the scaffold limbs (fig. 5), or 

 on the limbs a foot or so above the crotches, or on both trunk and scaf- 

 fold limbs. 



As an aid in the banding operation a reel for carrying the rolls of 

 banding material (Yothers and Carlson 23) will be found advan- 

 tageous and can be made as shown in figure 6. Where two persons 

 work together a rod inserted through the handle will enable several 

 rolls to be carried on the spindle at one time. 



In a single season's test, treated bands on sprayed apple trees from 

 June 10 to September 4 showed by chemical analysis a loss of ap- 

 proximately 50 percent of the beta-naphthol. The quantity remain- 

 ing, however, was sufficient to kill the larvae that would have trans- 

 formed to moths the same season. 



Band Removal 



The bands should be removed and burned before moth emergence 

 begins the next spring to destroy any live larvae present and to 

 prevent a new crop of worms from entering. Old bands that remain 

 on the trees from the year before contain so little chemical that they 

 would kill very few of the larvae the second season, and will do more 



