PLATE 23. 



Bacterial wilt of the cucumber. 



(Introduced to illustrate transmission ot the disease by insects). The central plant (variety Long green) was inoculated on June 1 7 with Bacillus 

 tracheiphilus by the striped cucumber-beetle (Diabrotica viltata). As a result the gnawed leaves first wilted and then the whole upper part of 

 the plant, the vascular bundles being occluded by the sticky while slime of this bacillus. Photographed July 1 , 1 905, About 1-14 natura 

 size. The entire plant was dead about two weeks later. 



