430 RicrouT ok tiik lIoiriicui/rruiST of ttie 



pies. Within llic black pimples iirc developed the germs of the 

 fungus wliich causes the disease. These germs are given forth and 

 washed by rain, or blown by wind, to other leaves or fruit where 

 they grow and form new diseased spots. In the fruit it also forms 

 circular sj)ots and develops black pimples like those formed on the 

 leaves. The diseased fruit Avithers, turns black, and becomes hard 

 and shriveled, clinging to the stems sometimes till the following 

 spring. The disease may also attack the green shoots. 



Treatment. — All diseased fruit shoud be taken fmui the vine- 

 yard, since it is capable of spreading the disease the following 

 spring. Triniiiiings from the fruit containing diseased hiTries 

 ought not to be returned to the vineyard in the shape of compost 

 as is sometimes practiced, since the diseased berries arc liable to 

 spread the black rot through the vineyard. 



This disease may be successfully controlled l>y th()roujj,h -^jji-ay- 

 ing if done at the right time. Bordeaux mixture, l-to-ll formula, 

 is used for this purpose. It is prepared as directed in Ihillctin 

 121. The applications are made as follows: 



I. Just as the pink tips of the first leaves appear. 



II. From ten days to two weeks after the first spraying. 



III. Ju-^t after the blossoming. 



IV. From ten to fourteen days after the third treatment. 



V. If a fifth treatment is necessary let it follow the fourth after 

 an interval of from ten to fourteen days. 



VI. If a later treatment than the fifth is needed, ammoniacal 

 solution of copper carbonate slirmld ho used; as that it less liable 

 to stain the fruit than the Bordeaux mixture. Directions for pre- 

 paring it are given below. 



The number of the treatments should be governed by the weather 

 conditions and the severitv of the disease. If the vinevard is not 

 badlv diseased,, and if there is not an excessive amount of hot, wet 

 weather, four treatments may be found sufficient for all practical 

 purposes. 



Tlir odrhj hr(ii))iP)ih are c.rtrcmely 'unportant. 



Thorough treatment is essential to success. 



