REPORT OF THE STATE ENTOMOLOGIST 1903 141 



has been so slow that those in the point of the triangle, less than 

 half a mile from the original infestation, are still free from the 

 pest. An examination of orchards just across the highway from 

 near this center, failed to reveal any scale. It should be stated 

 in explanation, that while the insect was allowed to breed in con- 

 siderable numbers from about 1897 to 1899, since then earnest 

 efforts have been made to keep it in check, and as a general thing, 

 it has been controlled in a fairly satisfactory manner. It is true 

 that there is one point of infestation a half mile southwest of the 

 source of trouble, but investigation shows that in all probability 

 the scale became established there by being carried on infested 

 trees which were set in that vicinity. 



Investigations and inquiries in a peach-growing section, where 

 the scale had become established in a few places 3 or 4 years 

 ago, reveals the fact that the pest has already obtained a foot- 

 hold in some orchards from % mile to 2 miles or thereabouts 

 from others, and in this instance we are inclined to believe that 

 these colonies established at a distance are due to the fact that 

 no very adequate control of the insect has been maintained. It 

 may also possibly be explained in part by the fact that young 

 scales are fully as likely to crawl on peach foliage as on that of 

 other fruit trees, and it would therefore stand a better chance of 

 being conveyed by insects or birds. 



New ' York plum scale (Eulecanium juglandis 

 Bouch^) . This species is well known as a very destructive form 

 to plumtrees in western New York, where it has at times been 

 exceedingly injurious. Our attention was called in August to a 

 plumtree at Kinderhook N. Y., which had the undersides of its 

 branches literally covered with full grown scale insects and a 

 great many young were found beside the parents. The tree itself 

 had suffered serious injury though there were no signs of any 

 numbers of the pest on those adjacent. This insect, as is well 

 known, can be readily controlled by spraying in the fall or early 

 spring with a contact insecticide, such as kerosene emulsion or 

 whale oil soap solution, and we see no reason why the lime-sulfur 

 wash, if it is to be employed in the orchard, would not be as effica- 



