12 LABORATORY MANUAL IN FIELD CROPS 



PRACTICUM NO. 9 



Object. A Study of Some of the Common Diseases and Pests 

 of Corn. 



Materials. Mounted specimens of the common insects: 

 earworm, root louse, chinch bug, click beetle or wire worm. 

 Mounted or dried specimens of the corn smut and ear mold. 



Method. A great deal of time should be spent in reference 

 work and in becoming familiar with the life history of the in- 

 sects and the fungi. 



STUDIES 



1. From the references at hand, write an article of at least 

 500 words on one of the common corn pests or diseases in your 

 State. 



2. How do the grasshoppers survive the winter ? 



3. What are the most important features in the life history 

 of the corn earworm ? 



REFERENCES 



Bailey's Cyclopedia of American Agriculture, Vol. 2, p. 35. 

 Farmers' Bulletin No. 248. 

 Weed's Life History of Insects. 

 Livingston's Field Crop Production, p. 93. 



