106 STATE POMOLOGICAL SOCIETY. 



before the leaves have unfolded, it would probably destroy all spore* 

 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." 



When applied to the young knots kerosene or linseed oil may kill 

 them. This could only be determined by noticing whether new 

 knots are formed around the old ones. Painting the knots would 

 certainly prevent the formation and spread of summer and winter 

 spores and narrow the formation of new knots to sources of infec- 

 tion outside of the tree. The outside sources are wild and morello 

 cherries. These should be destroyed. Mr. Knowlton sent us- 

 recently some plum and cherry twigs bearing knots that had been 

 treated with kerosene three times during the season. The}^ con- 

 tained no summer spores (ascospores) and only imperfect (peri- 

 thecia) and no winter spores. The mycelium did not appear to be 

 dead even on the young knots. This method should be tested 

 farther and we hope those who raise plums will paint the knots with, 

 linseed qil. We shall do so and also try to discover the missing, 

 links in the life history of this fungus. 



REMARKS. 



It must be apparent from what has been said, that the tendency of 

 the times is toward the use of chemicals, as preventive and direct 

 agents, against the attacks of injurious fungi, and that the copper 

 salts have proved the most efficacious. To apply these, spraying 

 apparatus has become almost as essential as the plow and hoe. 

 Great importance attaches to a proper selection of apparatus for the 

 different kinds of spraying, and the right fungicide or insecticide.. 

 For this reason we have placed on exhibition a few pieces of spray- 

 ing apparatus, that have been tried by experiment station officers 

 and recommended by them. These will be explained to any who 

 wish information regarding them. 



It must also be apparent, that a knowledge of the life history of 

 fungi is most important as a basis for the application of remedial 

 measures ; in order that there be no waste of time and expense in 

 trying unreasonable methods or those that have been tried and found 

 useless. With the name and life history of a fungus known ; with 

 a knowledge of the remedies that have been tried and found worth- 

 less or useful ; with an intelligent plan of action based upon the life 



