EXPERIMENT STATION BULLETINS. 447 



the Bordeaux) to kill bugs. The blight aud rot are not present every 

 season in Michigan, but in tests made at the College during several 

 recent seasons, it has paid to spray the plants when blight has not been 

 ])resent. The application of Bordeaux mixture in some way stimulates 

 the plant and it grows longer in the fall, is freer from sun scald, tip 

 burn and other troubles. Begin spraying when the plants are six or 

 eight inches high or when the first spraying for "bugs" has to be made 

 and repeat the treatment about every two weeks so that the new growth 

 will be covered with the Bordeaux mixture. If the w^eather is ''muggy," 

 conditions under which blight flourishes, spray oftener. Four or five 

 sprayings will usually be sufficient and they can be made for 80 cents to 

 $1.00 per acre for each spraying, all expenses of material and labor in- 

 cluded. 



HARVESTING. 



Do not dig until the vines are dead (except early varieties may be 

 dug when large enough to be marketable) if dug before the tubers 

 "skin" and are not as salable. If the plants have been killed by the 

 blight, delay digging until about ten days after the tops have died, by 

 this time the disease will have run its course and the potatoes that are 

 left will be sound and keep in storage. 



Dig when the soil is dry, and pick the potatoes up as soon as they 

 have dried off. Cool dark cellars are very satisfactory for storage. Pits 

 are good, but often difficult to open when wanted. 



H. J. EUSTACE, 



Horticulturist. 



