376 Report of the Horticulturist of the 



samples of it to someone competent to say wliether or not it is: 

 diseased. If it is diseased it should not be used. 



Pea. 



Weevil. — The weevil that infests peas is quite similar to the one 

 that attacks beans, but is somewhat larger. Its life history is the 

 same, and the same treatment applies to this that has been given 

 for the bean weevil. 



Tomato. 



Black Kot. — This disease is caused by the same black mold that 

 attacks the potato causing what some have termed the early blight. 

 It may attack the tomato vines, where it appears as dark spots. 

 ISTearly every grower is familiar with the black mold that attacks 

 the fruit in all stages of its growth. It usnally appears at the 

 flower end which at first turns dark. If the tomato be cut in two 

 more or less of the tissue will be found to be discolored. As the 

 disease advances a dark velvety mould forms over the diseased area. 

 The tomato clings to its stem until nothing is left of it but the skin. 



Rolfs reports" good results from treating the plants with Bor- 

 deaux mixture, and recommends that the first treatment be applied 

 when the flower buds begin to form. The treatment should be 

 repeated at intervals of about two weeks. The number of treat- 

 ments that will be necessary will depend on the prevalence of the 

 disease. Howell reports in Bulletin 11, Section of Yeg. Path., U. 

 S. Dept. Agr., 1890, that one treatment when the first fruits were 

 about three- fourths of an inch in diameter, and two later treatments 

 at interval of about two weeks were successful in controlling the 

 disease. He used Bordeaux mixture, 1 to 3| formula. 



Potato. 



Blight. — The disease which for many years has had the distinc- 

 tion of being known as the blight of potatoes is caused by a fungus 

 that may be said to resemble in a general way the fungus that 

 causes the downy mildew of the grape, although the two are not 

 even classed in the same genus. It passes the winter in infested 

 tubers where it may cause a discoloration beneath the surface which 

 is best seen in the ring of darkened tissue near the circumference 

 when a slice is cut through the middle of such a tuber. When the 



11 Bulletin No. 21, Florida Experiment Station, 1893. 



