284 S1:ATE iJOARt) OF AGRICULTURE. 



point, it is thought that the dust acted more quickly thaii the spray. 

 This difference would be attributed to the greater concentration of the 

 poison in the dust. 



CONCLUSIONS. 



This experiment indicates very strongly that dusting with calcium 

 arsenate as described, is an entirely satisfactorj^ method of controlHng the 

 larvae of the Colorado potato beetle. 



There were very few of the adult beetles'present when this work was 

 done. Considerable difficulty has been experienced at times in controlling 

 them by spraying. There is no apparent reason why dusting would not 

 be at least as efficient as spraying, as the poison when applied as dust is 

 usually in a more concentrated form. 



STORING SMALL FRUITS AT TEMPERATURES BELOW FREEZING. 



The work of the past year in the storage of perishable fruits was con- 

 fined to those that proved the most promising in the tests of previous 

 years; namely, the Montmorency cherries and the black raspberries. 

 They were picked at the regular season of harvesting, treated in various 

 ways and placed in the storage where the temperature was maintained at 

 18° to 20° F. In a general way it was found that these fruits kept better 

 when stored in an air-tight container such as a Mason jar or even a 

 crate wrapped tightly with paper. When stored in such a manner it was 

 found that there was less shrinkage and less change in the color of the 

 fruit during the storage period. Mold developed on the raspberries 

 when not stored in air tight containers. 



Sfc Montmorency cherries which were washed, stemmed and pitted, and 

 then placed in Mason jars and tightly sealed were stored successfully 

 from July until the following March. When removed from storage at 

 the latter tim,e the color, flavor, and general condition of the fruit were 

 excellent. Cooking tests made from these cherries proved that the fruit 

 was of a much higher quahty for pies than when canned cherries were 

 used or those stored in any other manner. 



POTATO &PRAYING. 



The work of the past season on potato spraying was confined largely 

 to comparative tests of the arsenate of lead with the calcium arsenate 

 as a poison to control the potato beetle. The tests prove that calcium 

 arsenate can be used as a substitute for the lead arsenate with very httlo 

 danger of foliage injury as there has been no foHage injury developed by 

 either of these poisons in this test. 



BUD SELECTION AND PERFORMANCE RECORDS WITH APPLES, 



This work started in 1914, the past year completing the fifth season 

 in which the section has been cooperating with the United States 

 Department of Agriculture on obtaining records from a plot of 120 Bald- 

 win trees at Belding in the orchard of Mr. B. F. Hall. Records have been 

 kept for each of these trees as to the size, yield, and peculiarities of the 

 fruit produced. While the records thus far show no great variations 

 in the productiveness of the trees some very interesting and important 

 variations in the type of fruit produced have been discovered. One of 

 these important types has proved to be of very poor storage quality. This 

 experiment will be continued the coming season. 



