EXPERIMENT STATION BULLETINS. 339 



Cucumber Scab (Spot Rot) is also a fungous disease and appears on 

 the fruit in velvety olive green patches, often accompanied by a gummy 

 exudate. Diseased fruits decay rapidly after picking and are worthless. 

 The disease is worst in hot, moist weather where the vines are crowded. 

 Destroy all trash and practice rotation. Spraying is of doubtful benefit. 



Wilt is a sudden wilting of the vine without discoloration of the 

 leaves due to a bacterium which enters and clogs the water vessels of 

 the plant. Remove all diseased plants and keep down the striped beetle 

 which spreads the disease. 



Cucumber Mosaic (White Pickle) causes a stunting of the vine ac- 

 companied by a green and yellow mottling of the leaves. Pickles from 

 diseased vines are warty and mottled green in color. It is spread by 

 insects, especially plant lice, and probably by the pickers handling dis- 

 eased and healthy plants. Remove all diseased vines at once and destroy 

 the lice as fast as they appear. 



C. P. HALLIGAN, 

 Acting Horticulturist. 



Note. — This publication is a revision of Circular 19, by Walter Postiff, 

 with contributions from the departments of Horticulture, Botany, En- 

 tomology, and T. V. EUzey of the H. J. Heinz Company. 



