768 NEW YORK STATE MUSEUM 



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noted. Many small limbs were dead, probably winterkilled, on 

 trees 47, 90 and 114. A large dead limb had been cut off of 

 tree 45, the tops of trees 47 and 90 were thin, and all that 

 remained of tree 72 was a stub with vigorous suckers. 



July 3, the following conditions were noted. There were very 

 few or no young scale insects on trees 26, 27, 46, 47, 72, 90 and 

 113; very few young were found on trees 74, 112 and 114; few 

 young were found on tree 28; young were rather abundant on 

 tree 45, and abundant on tree 73. At this time the sprouts on 

 tree 72 were growing slowly. 



Aug. 9, the conditions were as follows. There were very few 

 or no young on trees 26, 27, 45, 46, 47, 74, 90, 91, 112, 113 and 

 114; young were rather abundant on tree 28, and abundant on 

 tree 73. Tree 72 was represented only by a stub at this time. 



Sep. 25, the following conditions prevailed. There were few 

 or no living scale insects on trees 26, 27, 46, 47, 91 and 113;. 

 there were very few on tree 28; few on trees 45, 72 and 90; 

 relatively few on trees 74, 112 and 114; and they were very 

 abundant on tree 73. 



The condition of this lot of trees Sep. 25 was fairly satisfac- 

 tory if we except tree 73, and the occurrence of abundant youngf 

 on this can be explained only by the probability of a number 

 of insects being so sheltered by the very rough bark that the 

 spring application of petroleum did not reach them. The pres- 

 ence of a few scale insects at the end of the season on tree» 

 45, 72 and 90 is not surprising, considering that they could 

 have easily become infested from other trees, even if all 

 the living scale insects on them at the time of the treatment had 

 been killed by the petroleum. The occurrence of more living- 

 scales on trees 74, 112 and 114, all of them located on the ex- 

 treme edges of the orchard and in positions where they would 

 be most likely to have the pest carried to them by birds and 

 other insects, gives additional weight to the opinion that the 

 results produced by the various insecticides have been modified 

 during the growing season by the conveying of crawling young 

 scale insects to the trees by various natural agents. A very 



