LABORATORY AND FIELD WORK 425 



CHAPTER XXIV 



It will not be feasible in most schools to do any formal work in 

 connection with the subject of this chapter. Students should be 

 on the lookout for plants attacked by parasitic fungi, and, with 

 the aid of the teacher, should learn to place in their appropriate 

 groups the more important disease-producing fungi such as smuts, 

 rusts, powdery mildews, downy mildews, damping-off fungi, and 

 those which cause leaf- and fruit -spots. Lists may also be made 

 of the plant diseases that are most troublesome in the immediate 

 locality, and the students should become familiar with the means 

 by which these particular diseases may best be checked. Help 

 may always be had from the nearest agricultural experiment 

 station in the identification of parasitic fungi. 



