FOREST, FISH AND GAME COMMISSIONER. 269 



heavy cloth such as canvas or factory, and all such bags should be thoroughly 

 boiled or otherwise sterilized at the conclusion of each job. 



"5. Suspicious pine plantings to be thoroughly inspected during the 

 last two weeks in May and the first week in June (between May i o and June 

 10 probably safe.) This is very important in 1910 and should be repeated 

 in 191 1, the thoroughness in that year depending largely on 19 10 findings." 



An examination of our shipping records indicated that German white 

 pine seedlings had been sent to forty-six different applicants and that trans- 

 plants were distributed to thirty-eight parties. A division of territory was 

 arranged with the Department of Agriculture and the above plan was faith- 

 fully carried out and the work completed by August 15th. We wish to 

 acknowledge the generous, efficient assistance given us by that Department 

 and without their aid the work could not have been done early enough 

 to be sure of satisfactory results. 



In order that the disease may be combated intelligently it is necessary 

 to understand its life history. As already stated the disease is a rust and 

 like other rusts it passes its life on two distinct kinds of plants. In this 

 case the two plants are the white pines (here used to include all pines having 

 five needles in a sheath and includes our native white pine, the sugar pine of 

 the western United States, the European stone pine and a few others of lesser 

 economic importance) and a group of plant called Ribes, which includes 

 both wild and cultivated currants and gooseberry bushes. This disease is 

 propagated by means of spores and in order for the disease to spread both 

 pine and currant or gooseberry bushes must be located near enough together 

 that the spores may be carried by the wind from one to the other. The dis- 

 ease is of but little importance as far as currants or gooseberries are con- 

 cerned but to the pines it is most serious. . 



" The white pine blister rust* is particularly noticeable in the spring, 

 from the middle of April to the middle of May.f It then covers the trunk 

 of young plants of four or five years and over, as well as the trunk and 

 branches of older trees, with bright yellow blisters (Aecidia.) From these 



* A translation from circular No. 5 of the German Imperial Biological Institute for Agriculture 

 and Forestry written by Prof. Dr. Carl Freiherr von Tubeuf and translated by A. J. T. Von Lear, 

 published by the Department of Agriculture, Albany, 1909. 



fProf. Stewart thinks that it is very doubtful if the disease appears as early in April in this 

 country and would expect to find it the last two weeks of May. 



