younger. Apples, pears, peaches, plums, prunes, quinces and cher- 

 ries are included in this block. The fifth block contains trees of 

 about the same size as those in the fourth and includes plums, 

 prunes, apricots and nectarines. 



Condition of Infestation. 



The infestation was carefully studied by the entomologists of the 

 Station and it was found that the scale had spread from the origin- 

 ally infested trees southwest along the middle of the orchard where 

 it was very abundant, while toward the sides it was less in evidence 

 and on some trees no scales could be found. As might be supposed 

 from the location of the originally infested trees, the first and second 

 blocks were in the most serious condition. Elsewhere the infesta- 

 tion was scattered, though in some cases a single tree without 

 infested neighbors was found to be affected. 



It was noticeable on nearly all the infested trees that the scale 

 was present only on the smaller limbs and twigs except in cases 

 where it was very abundant, when the upper part of the trunk often 

 became involved. With slightly infested trees a single branch — 

 usually nearly horizontal and at some spot not concealed by leaves — 

 generally appeared to be the center of distribution, suggesting the 

 thought that at that convenient spot some bird or insect carrying the 

 crawling young had alighted. In a few cases after failure to find 

 the scale by general inspection, an examination of such places 

 revealed its presence. 



The condition of the orchard was reported to the Trustees and 

 experimental work in the orchard was authorized. 



Preparatory Work. 



There were 612 trees in the orchard, each of which was inspected 

 to learn its condition. A number marked on a tag was attached to 

 each tree and the number, kind, variety and condition of infestation 

 were recorded on a plan of the orchard and also in a book. The 

 trees were then cut back as severely as was deemed wise and the 



