14 
Colorado Experiment Station 
destroy the small caterpillars. While pruning, many of the egg masses 
can be cut off and destroyed. The nests can be burned out with a 
torch. 
'Ball W eh worm .—The webs do not appear until late in the sum¬ 
mer. The insect hibernates in the pupa stage. The moths, which are 
white, emerge in the late spring and summer when they lay their 
eggs upon the leaves. The worms enclose within their loose web all 
the foliage upon which they feed, while the Tent Caterpillar spins a 
smaller nest to live in when not feeding. See Fig. 6. 
Fig 6.—Fall Web-worm; a and b, caterpillars; c, chrysalis; d, moth. (Howard. Year¬ 
book, U. S. Dept, of Agriculture, 1895.) 
Remedies .—Same as for Tent Caterpillars. 
Apple Flea-Beetle .—This is a small metalic-green beetle about 
one-sixth of an inch in length, with hind legs so developed that it can 
jump like a flea. These beetles sometimes attack young trees or 
newly budded or grafted nursery stock, and do serious damage by 
eating holes in the leaves. Very little damage is ever done large trees. 
Remedies .—Any of the arsenicals (2-4-5) are quite effective in 
destroying this pest. Any material that will form a dust over the foli- 
