DISEASES OF PLANTS. itiJo 



Tlie c^op was harvested July 24 and it was found that the treatments 

 gave almost wholly negative results in preventing club root. August 

 10 a second seeding was made, the soil having received treatment 4 

 days before, the proportions of the fungicides being somewhat modi- 

 fied. From the results obtained the author concludes as follows: 



"Air-slacked stone lime gave sufficient evidence of its usefulness as a preventive of 

 club root of turnips to warrant its being recommended for tbis purpose. When so 

 employed it is advised that it be used at the rate of not less than 75 bu. per acre and 

 api)lied at least 3 months previous to the time of planting. 



" Gas lime, kainit, and ashes all failed to prevent the malady. Gas lime and kainit 

 are both injurious to the crop. 



"A half-strength solution of corrosive sublimate applied to the soil at the rate of 

 4,320 gal. per acre was not harmful to the plants and gave evidence of having mate- 

 rially diminished the amount of clubbing. Equal quantities of half-strength solution 

 of Ijordeaux mixture and ammoitiacal copper carbonate proved of no value as club 

 root fungicides and were decidcdlj^ injurious to the plants. Half-strength Bordeaux 

 mixture applied to the foliage once in 20 days did not prevent turnip-leaf blight." 



Experiments with cahhage (jip. 14-18). — The experiments with cabbage 

 were conducted under the same conditions as the experiments above 

 described for the turnips. The conclusions of the author are as follows : 



"Air-slacked stone lime is a preventive of the club root of cabbage. The best 

 results were obtained from the smallest application — that is, at the rate of 75 bu. 

 per acre. 



"Gas lime, kainit, and wood ashes are allequally ineffective as club root fungicides. 



"A half-strength solution of corrosive sublimate at the rate of 2,160 gal. per acre 

 can not be recommended, for although an apparent preventive of club root, the solu- 

 tion is destructive to the plants. A weaker solution might prove just as effective as 

 a fungicide without interfering with growth. 



"Neither half-strength Bordeaux mixture nor ammoniacal copper carbonate when 

 used at the above rate diminished the amount of clubbing and both were very 

 injurious to the plants." 



JExjyeriments withtomatoes {])p,18-20). — In these experiments theobject 

 was to test the effect of various strengths and number of applications 

 of Bordeaux mixture and ammoniacal copper carbonate required for the 

 prevention of the various diseases affecting the tomato. Three strengths 

 of solutions were used, and in testing the number of applications required 

 from 2 to 8 sprayings were given the plants. Late in the season sev- 

 eral diseases were noticed on sprayed and check plants, but not in any 

 great abundance. The diseases were so poorly shown on the check 

 plants that the results have little if any practical bearing. The experi- 

 ence of the author in staking tomato plants so as to raise the stem and 

 branches clear of the ground led him to conclude that such treatment 

 was not advisable. 



Experiments with potatoes (pp. 20-24). — The fourth series of experi- 

 ments was with potatoes, an effort being made to prevent scab by the 

 use of different strengths and methods of application of corrosive sub- 

 limate and Bordeaux mixture. In the cultural belts the plants were 

 sprayed for the prevention of leaf diseases, but so little disease was 

 present on the checks as to render these experiments of little value. 



