20 



The Bulletin. 



of the trees are so badly infested that they will surely die before winter, 

 then either give those trees thorough summer treatment or destroy them. 

 Likewise, if you fail to get the orchard treated as intended, and spring 

 opens up with a lot of badly infested trees in the orchard, the very worst 

 ones should be cut out. 



It should be remembered that all through the late spring, summer and 

 fall, even until Christmas, or perhaps later, the scale will be breeding, 

 and every wind or passing bird may carry away the young lice and 

 establish them on new trees. This is why the trees which are already 

 useless should be destroyed — they can not do good, and they do much 

 harm by spreading the scale. 



I 



.*! 



Fig. 6. — Same ortiiard as showu in Fig. 5, after being pruned and spraj'ed. Note that all branches 

 were shortened and that the trees are in thrifty condition. (Photo by Sherman.) 



Late summer and fall, say from late August to middle of November, 

 is the season when the scale multiplies and spreads most rapidly. This 

 makes it especially important to take out whatever trees are going to 

 be destroyed before midsummer. 



There is one case in which we would advise destruction of trees that 

 might be saved. Suppose a man has a7i orchard of young trees and finds 

 only a very few trees badly infested. In such a case we may hope that 

 it has not spread far, and by promptly destroying those few trees — even 

 if they could be saved — and by thoroughly treating all the tr^es close 

 by, he may so check the scale as to avoid the need of fighting it on all 

 his trees for several years. But it must be remembered that the scale 

 will likely be more widespread than at first appears, so that close watch 

 must be kept for it in all parts of the orchard. 



But let us say again that we do not advise the destruction of trees 

 except in extreme cases. If you are in doubt whether or not to destroy 

 a tree, then spare the tree; but (and this is the important point) do not 

 fail to treat it thoroiigJdy at the first suitable opportunity. 



