216 SOUTHERN FIELD CROPS 



LABORATORY EXERCISES 



(1) Examine the tips of a number of ears of corn and make an 

 estimate of the percentage of ears injured in that field by the corn 

 ear-worm. 



(2) Make germination tests, preferably in the open ground, 

 of 100 weevil-eaten and of 100 sound kernels ; determine 



(a) the percentage of each that germinates, and 

 (6) the difference, if any, in the size of the young plants 

 when a few weeks old. 



LITERATURE 



BURRELL, T. J., and BARRETT, T. J. (Ear rots.) 111. Expr. Sta., 



Bui. No. 133. 

 STEVENS, F. L. (Ear rots.) N. C. Expr. Sta., Rpt. 1907-'8, 



pp. 37-39. 

 BISHOP, F. C., and others. (Corn ear-worm.) U. S. Dept. Agr., 



Farmer's Buls. Nos. 212 and 290. 

 BOWMAN, M. L., and CROSSLEY, B. W. Corn (Diseases and 



insects), pp. 229-260. Ames, la., 1908. 

 CHITTENDEN, F. H., and others. U. S. Dept. Agr., Bur. Ent., 



Circ. No. 59 ; and Kan. Board Agr., Dec., 1905, pp. 258-264. 



