16 



warts began to appear. As they do not all come out at once, ex- 

 amination and application of the remedies were made three times 

 during the summer, all warts being painted over each time. 



RESULTS. 



In three examinations made with the microscope during the fall 

 and winter, no spores, (ascospores) were found in the warts. In fact 

 none of the sacks (perithecia) were developed enough to produce 

 them before the warts were destroyed by the remedies. In some 

 cases where the kerosene and turpentine were applied in so large 

 quantity as to spread around the branch or to run down it, the 

 branches were killed. No such injury occurred where the linseed oil 

 was used. 



CONCLUSIONS. 



1. Linseed oil, turpentine and kerosene all effectually destroyed 

 the plum wart. 



2 Turpentine and kerosene must be used with great care. 



3. Examinations should be made at least three times during the 

 summer, from June 1st to August 30th. 



4. Enough of the liquids must be applied to saturate the wart. 



5. As the plum wart is readily propagated on the wild clioke 

 cherry all such trees sliould be destroyed, and all of the v^^arts upon 

 the trees of the garden (morello) cherry should receive the same 

 treatment as those on the plum trees. 



SUGGESTION. 



While the above remedies have proved effectual it is suggested 

 that possibly a more harmless remedy may be found in the use of 

 sulphate of copper, although no experiments have been made with it 

 to our knowledge. Applied with the hand pump in the spring, be- 

 fore the leaves have unfolded, it would probably destroy all spores 

 lodged in the crevices of the bark ; and used in concentrated solu- 

 tions with the brush it would probably destroy all warts that might 

 start later in the season from the mycelium or spores remaining in 

 the tissues during the winter. 



TESTING NEW VARIETIES. 



Owing to the lateness of the season when the Hatch Appropriation 

 was available, our plans for experimentation with varieties of fruits, 

 vegetables, flowers, etc., were not matured in time to do much satis- 

 factory work. 



