74 DISEASES OF GINSENG. 



they avail little if the spraying is done at the wrong time. The 

 incubation period, that is, the time required for the diseased 

 spots to appear after infection, is from four days to a week. If 

 the fungicide be applied directly after the rain, in order that it 

 may not wash off, infection will have already taken place, and the 

 spots will appear some days later in the leaves now coated with 

 the poison. Spraying has often been condemned on account of 

 untimely application. 



[It is true that spraying with Bordeaux has often been con- 

 demned on account of untimely applications. Some growers 

 claim it to be time and money wasted, claiming that they made a 

 thorough test and proved it useless, it having a detrimental rather 

 than a benificial effect. But investigations invariably disclose 

 the fact that such growers were neither thorough in their work, 

 nor did they follow instructions. 



What is often considered a thorough job with some people, 

 is, in reality, only the beginning of a job, so that with such people 

 it is advisable that, when they think they have done a thorough 

 job, to make sure, they had better go over it at least once more. 



Many mistake the spraying for a cure in place of its being 

 a preventive. They do not begin spraying until after the disease 

 has made its appearance. Others apply the bordeaux with a 

 sprinkler or with a broom, in place of with a sprayer. Their 

 garden, after what they call spraying, has the appearance, as if a 

 whitewasher had used it for a rug while whitewashing a room, and 

 had been rather wasteful with the whitewash; and still such people 

 wonder, why their work was not effective. 



Still others are careless in the very beginning. In making 

 their Bordeaux, they use poor lime, or do not properly mix the 

 lime solution with the solution of copper sulphate; or they allow 



