330 Agricultural Experiment Station, Ithaca, N. Y. 



9. The late blight of potatoes may be successfully treated by 

 spraying the vines two or three times with the Bordeaux mixture. 

 The first application should be made during the latter part of July ; 

 it may be repeated at intervals of one-to three weeks. (Page 312.) 



10. The early bliglit of potatoes may be treated with partial 

 success by means of the Bordeaux mixture. The vines should be 

 sprayed when about two-thirds grown, and the application should 

 be repeated as necessary, the foliage at all times being well covered 

 with the mixture. (Pages 3 1 2, 313.) 



11. Proper methods of fertilization and cultivation have also 

 proved to be of much value in reducing injury from early blight, 

 as was shown by greatly increased yields. (Page 313 ) 



12. The apparent increased yield per acre of potatoes sprayed 

 with the Bordeaux mixture was 44.8 bushels. (Page 318.) 



13. The increased yield per acre of potatoes well fertilized and 

 cultivated, as compared with partially neglected plants, was 100 

 bushels per acre. (Page 318.) 



14. Seed potatoes affected with scab may be cleaned and made tit 

 for planting by soaking them in a solution of corrosive sublimate. 

 (Pages 318, 319.) 



15. An alkaline condition of the soil favors the growth of the 

 scab fungus ; an acid condition checks it. 



16. Land in which the fungus causing potato scab is known to 

 exist should not be used for growing potatoes or beets except at in 

 tervals of several years. Fertilizers which tend to produce an acid 

 condition of the soil should be applied. Even treated seed will pro- 

 duce scabby potatoes, if the scab fungus is in the soil. (Pages 

 319, 321.) 



IT. Potato beetles may easily be destroyed by means of the 

 arsenites. Paris green and London purple are the safest insecti- 

 cides to use. (Pages 322, 323.) 



18. Flea-beetlos cannot i)e controlled satisfactorily. i>ordeaux 

 mixture thoroughly aj)plicd, appears to be the best practical remedy 

 against these insects. This material probably does not kill the 

 beetles, but simply keeps them away. (Pages 323, 324.) 



19. In a compai'ative trial of many kinds of machines designed 

 for spraying potatoes, it was found that those machines were unsat- 

 isfactory in which liquids are distributed wholly by the force of 

 gravity. 



20. Gravity sprayers are of value when the liquids are broken 



