650 Journal of A gricultural Research voi. xiii. no. u 



CONCLUSIONS 



The spotting and streaking of bean pods and stems, herein described 

 is due to sunscald. 



No damaging effects due to this scalding have been observed. 



The scalding is diminished or prevented by the shade of leaves, but 

 when these wither, it may occur in a period of six days. 



No varieties of beans have been observed to be immune from sunscald 

 where sufficiently exposed. 



At certain stages of the disease the appearance may easily be mistaken 

 for bacterial infection, and can not be differentiated except upon exami- 

 ation under the microscope. 



PLATE 64 



A. — Six pods of the Green Bountiful variety of beans which showed natural sun- 

 scald on September i. 



B. — Reverse side of the six pods shown in A. 



