134 



BACTERIAL DISEASES OF PLANTS 



Fig. 65. — Porticjii of a cucumber leaf wilted by BacUlua trfichfdphilus (which 

 was abiuidant in many of the smaller veins) and then greedily gnawed by the 

 striped cucumber beetle {Diabrotica vittata). Such beetles are then infectious to 

 other plants. 



^. 



Fig. GG. — A healthy cucumber leaf slightly gnawed by an infected striped beetle 

 and' developing the bacterial wilt around the bitten places. From a field near 

 Washington, 1893. 



