New York Agricultural Experiment Station. 609 



dirt from crown, and paint all his infested one year old peacli trees, 

 between 3,000 and 4,000, with linseed oil. 



This stock was all budded and apparently the " Pernicious Scales " 

 had been on the buds used. This necessitated the removal of the 

 dirt from the crown. The plan was to wash the body and crown of 

 the trees while the dirt could be easily removed and while other 

 work did not interfere, then wash the tops after the leaves had 

 fallen. 



About ten days after the peach trees were treated with the lin- 

 seed oil the teaves commenced to turn yellow. By November 1st a 

 good many of the trees were dead and all were injured to such an 

 extent that they were worthless, and all were destroyed. 



One peculiar fact noted was that the peach trees treated first 

 as a trial were not injured to such an extent as those treated ten 

 days later. Whether this difference was due to a difference in the 

 oil, or whether there was a difference in temperature which may 

 have caused a large portion of the oil applied to the first lot of trees 

 to run from them is not known. 



'No injury resulted to any of the apple trees treated, possibly if 

 the oil had been applied to the twigs it would have injured them as 

 readily as the kerosene emulsion did during the winter. 



During the first half of JSTovember Mr. Foulk cut back between 

 10,000 and 12,000 two year old apple and plum trees and removed 

 dirt from collars. These he had washed with whale-oil soap solu- 

 tion, two pounds to one gallon of water. When inspected Novem- 

 ' ber 15th, it was found that the cold weather together with the 

 frothiness of the solution had interfered with the thorough applica- 

 tion of the wash. As a result some of the " Pernicious Scales " had 

 escaped. All of these trees were re-washed, care being taken to 

 keep the wash hot for the workmen. 



Gas Treatment. — Before the spring shipping season opened Mr. 

 Foulk of the firm of Keene & Foulk made two fumigating boxes 

 for the purpose of treating with hydrocyanic acid gas all suspected 

 stock sold. These boxes were 13 x 3 x 3 feet made of flooring and 

 without a cover. White lead was used for filliog the mortises and 

 putty for the larger joints. The outside of the boxes was entirely 

 covered with oiled muslin and the latter given two coats of paint. 

 Each box cost about ($10) ten dollars. 



The same amount of chemicals was used to each box of trees as 

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