72 



CIRCULAR 270, U.S. DEPARTMENT OF AGRICULTURE 



DUSTING MATERIALS 



Dust mixtures have not been so satisfactory as liquid sprays, on 

 the whole, although in some instances they have been used success- 

 fully. A mixture containing 10 percent of lead arsenate, 75 percent 



of sulphur, and 15 

 percent of filler, such 

 as gypsum or hy- 

 drated lime, finds 

 some use as a com- 

 bination insecticide 

 and fungicide. 

 Nicotine dusts, com- 

 posed of hydrated 

 lime impregnated 

 with nicotine, are 

 much used on truck 

 crops and may also 

 be used on fruit 

 trees. Dusting must 

 be done in calm 

 weather if it is to be 

 successful. 



TREE-BANDING 

 MATERIALS 



Bands of burlap 

 or corrugated paper 

 may be used to trap 

 larvae of the codling 

 moth. If the paper 

 bands are impreg- 

 nated with a mix- 

 ture of beta-naph- 

 thol and oil, as 

 mentioned on page 

 8, it will not be 

 necessary to remove 

 them at intervals to 

 destroy the larvae 

 that crawl into them 

 (fig. 82). Bands are 

 also valuable to prevent climbing cutworms from getting into the 

 trees. Their use for this purpose is explained on page 30. 



BAITS AND LIGHTS 



Poisoned baits may be used for combating cutworms, as explained 

 on page 31. Attractive baits, composed of about 1 part of good 

 molasses to 10 or 15 parts of water, are very useful for indicating the 

 presence of codling moths in the orchard. For this purpose the bait 

 should be placed in a suitable container, such as a small kettle with 

 a bail, suspended 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). 



Figure 82. — Chemically treated band on apple tree. 



