128 NEW YORK STATE MUSEUM 



most instances the living bark of the trees ranged from slightly 

 green to a perfectly healthy green, and it was then expected 

 that a goodly proj)ortion would develop a fair amount of foliage. 

 All the scale insects appeared to be killed. One peachtree in 

 an adjoining orchard, which had been sprayed at the same time 

 and under similar conditions with the 20^ mechanical emulsion, 

 was examined in March, and it was found that the fruit buds 

 had apparently escaped all injury. 



An inspection of the same trees May 6 showed that a number 

 had died, though this is not surprising after allowing for the in- 

 juries by the scale insects and also for the damage done by the 

 round-headed borer, which was exceedingly' abundant in the 

 orchard. The trees sprayed with the crude petroleum emulsion 

 showed little or no more injury than those beside them treated 

 with wbale oil soap, and we are therefore inclined to believe that 

 the petroleum inflicted relatively little injury. 



This mechanical emulsion, as previously stated, was applied 

 under the same conditions to other trees, and the observations 

 made on thorn are of considerable interest. May 6 these other 

 sprayed trees were examined with the following results. A 

 Dutchess pear showed a few dead limbs, was not badly infested 

 and bade fair to produce some blossoms. Another of the same 

 kind was leafing out nicely and gave evidence of producing a 

 number of blossoms. A Globe peachtree presented a very fair 

 bloom, though some limbs were dead at the tips. The latter we 

 are inclined to believe was due to the weather of last winter, 

 because similar injury was observed on a number of untreated 

 trees. Meeches prolific quinces, of which several bushes were 

 treated, were in excellent condition and had an abundance of 

 flowers. Several Bartlett peartrees possessed a very good 

 foliage and an excellent bloom. 



These and some other trees treated with crude petroleum 

 emulsion the preceding December were also observed June 12 

 with the following results. A Lombard plumtree was found 

 to be nearly uninjured by the oil, while several Clapp's favorite 

 peartrees were hurt to some extent, the bark cracking in places 

 in the case of one tree and none bearing any fruit. Some injury 

 and no fruit was true of a Bartlett peartree, while another bore 

 considerable fruit and two others some. A Botan ]>lumtree had 



