IS 



CIRCULAR 464, U 



DEPARTVLEXT OF AGRICULTURE 



r _j _ Ki B. 



terpillars on tree trunk below 

 sriety band- 



trees, burlap should not be ap- 

 plied until after June 15. when 

 most of these caterpillars have 

 pupated. Otherwise they may 



form their cocoons beneath it, 

 and the workmen may be poi- 

 soned by the poisonous hairs 

 that accumulate there. 



VSE OF STICKY BANDS 



Bands of sticky tree-banding 

 material, which may be obtained 

 on the market, may be used on 

 tree trunks (fig. 8) after the bark 

 has been scraped so that the 

 material can be applied evenly 

 in a thin layer with a paddle. 

 These bands prevent caterpillars 

 from ascending the trees, and if 

 proper treatment of egg clusters 

 has reduced the number of lar- 

 vae sufficiently, this is a very 

 eiTective measure. Further- 

 more, as the caterpillars are 

 usually massed inlarge "nmnbers 

 beneath the bands, conditions 

 are favorable for wilt disease to 

 develop, and the caterpillars 

 often die in large numbers from 

 this disease and from starva- 

 tion. Every week or 10 days 

 during the caterpillar season a 

 comb or similar implement 

 should be rim over the band to 

 keep the surface from harden- 

 ing and to bring up fresh, sticky 

 material from the part near the 

 bark. This material is expen- 

 sive, and considerable labor is 

 required to prepare the trees 

 and apply and tend the bands. 

 In some locations, particularly 

 where there has been a heavy 

 deposit of egg clusters on debris 

 on the ground or in stone walls, 

 its use is advisable. 



. 



USE OF GYPSY MOTH TREE-BANDING MATERIAL 



A black greasy substance called "gypsy moth tree-banding material' 3 

 is sometimes used to prevent caterpillars from crawling up the trunks 



of trees. It is similar to the product known as •'Eaupenleim" that 



