18 



BACTERIAL DISEASES OF PLANTS 



FIG. 10. Two young tomato plants of a sensitive variety inoculated and 

 wilting on leaf marked X, as a result of needle-pricks introducing the Sumatran 

 strain of Bacterium solanacearum which had been exceedingly virulent but was'now 

 losing its power to infect. These plants recovered and are shown in Fig. 11. 



FIG. 11. Same as Fig. 10, but after 2M months. Plants recovered. The 

 only part of the stem to develop incipient roots was the base near the'inoculated 

 leaf. Plants 2 feet 6 inches and 2 feet 11 inches high. Leaves not reflexed. 



