22 



on the presence of winter spores that are formed on the 

 white patches of mycilium growing on the wood, and some- 

 times also on the fruit. It is therefore of the utmost 

 importance that every patch of mycelium present on the 

 wood and fruit should be carefully scraped off and burned. 

 This work should be done as early in the season as 

 possible, otherwise some of the winter spores may fall 

 to the ground, where they will survive the winter and 

 possibly prove a nuisance the following spring. 



(2). Spraying. As the result of personal experi- 

 ence, supported by the testimony of others who have 

 experimented under my direction, I strongly recommend 

 as a spraying solution one part of commercial sulphuric 

 acid diluted with one thousand parts of water. This 

 solution, consisting mainly of water, does not adhere to 

 the foliage for any length of time, and constant spraying 

 is necessary if the disease appears. In such cases I find 

 that if bushes showing incipient stages of disease are 

 sprayed for three days in succession, the disease is 

 entirely checked, but it is always wise to spray, say once 

 a week in anticipation. I have used a stronger solution 

 later in the season without in any way injuring the 

 foliage, up to one part of acid in seven hundred parts 

 water. As previously stated, different strengths must be 

 carefully tested, but there is no advantage in using a 

 very strong solution under any circumstances. 



The finer the spray the better it adheres to the 

 foliage. If the spray is too coarse the particles run 

 together to form drops large enough to run off the 

 foliage. The same result follows spraying too much 

 liquid on to a bush. 



