THE WHITE-PINE BLISTER RUST. 5 



At particular times of the year, look for the different stages of the 

 disease, as follows : 



Last of April to middle of June. Search for blisters on planted pines. (PL I, A y 

 fig. 1, and fig. 4, a). 



June 1 to fall of leaves. Search on leaves of all wild and cultivated currants and 

 gooseberries for the yellow, summer stage of the disease. (PI. I, B and C, and fig. 4, 6 

 and c). Pay special attention to cultivated black currants and to the flowering or yel- 

 low currant. 



August 1 to fall of leaves. Search on the leaves of wild and cultivated currants and 

 gooseberries for the brown-hair or autumn stage of the disease (PL I, D, and fig. 4, d). 



If it is believed that the disease is found, get an expert at once to 

 verify your opinion. Do not destroy trees or bushes until this is 

 done, as such destruction may not be necessary. 



When advised by a competent person to destroy certain trees or 

 bushes, do so at once. Delay may mean much more damage. An 

 owner refusing to take the necessary measures to control this disease 

 will be injured first and most severely by the future progress of the 

 outbreak. 



HOW TO BUY WHITE-PINE STOCK FREE FROM BLISTER RUST. 



Buy 5-needle pine stock only when a written guaranty is furnished 

 by the nurseryman in the following form or its equivalent : 



I, , do hereby guarantee that the 



[Name of nurseryman.] [Number of trees.] 



trees of pine furnished to were grown under the 



[Kind of pine.] [Name of buyer.] 



following conditions: 



1. They were raised from seed in my own nurseries. 



2. My nurseries contain no imported 5-needle pines or imported currants or goose- 

 berries. 



3. My nurseries and the neighborhood for 300 yards distant have no white-pine 

 blister rust present now and have always been free from white-pine blister rust on 

 5-needle pines or on currants or gooseberries. 



(Signed) 



Such a guaranty will insure the securing of stock free from this 

 disease. Any essential modification of this form will leave loopholes 

 for evading the purpose of the guaranty. 



This has absolutely no connection with the usual certificate of 

 inspection made by a State officer. The inspection certificate alone 

 is useless, so far as the blister rust is concerned, as the disease in its 

 dormant stage can not be detected by inspectors, 



DANGER FROM THE WHITE-PINE BLISTER RUST. 



The white-pine blister rust is a disease which finally kills the at- 

 tacked trees or parts of trees. If the trees are attacked while rela- 

 tively young, that is, 25 years of age or less, it is extremely likely 

 that the entire tree will be killed. If the tree is older than this 

 when attacked, branches and possibly the top central shoot will be 



