BASIC COPPER SULFATE AS A FUNGICIDE 



131 



Table 2. 



Relative Effectiveness of Basic Copper Sulfate and Bordeaux in Controlling 

 Anthracnose of Cucumbers 



Fungicide 



Basic copper sulfate 3.84-50. , 

 Bordeaux mixture 4-4-50. . . 

 Check 



In conclusion Guba states that basic copper sulfate showed no inferiority to 

 homemade Bordeaux in the control of anthracnose on cucumbers. Both readily 

 controlled powdery mildew which was apparent on practically all leaves in the 

 check. Both fungicides appeared to be equally toxic to young cucumber leaves 

 although the injury could not be considered serious. 



Celery 



The celery experiment consisted of 4 plots, 64 by 12 feet, of 4 rows, 3 feet apart, 

 each. The plants were raised in a seed bed and set out on July 15. Basic 

 copper sulfate (lot 2) 3.84-50 and Bordeaux 4-4-50 were applied on June 25 to the 

 plants in the seed bed when 1.5 inches high, and again on July 9; in the field on 

 August 2, 5, 11, 17 aind 25 and September 1, 9 and 21. Nicotine sulfate was added 

 on September 9. The basic sulfate was applied both with and without the com- 

 bined spreader. 



A knapsack sprayer was used in the seed bed and in the field a Bean Truck or 

 Arlington X. L. sprayer with Friend nozzles under 200 to 250 pounds pressure 

 covering 4 rows, 3 nozzles to a row. The entire planting was inoculated with a 

 spore suspension of Cercospora apii Fries and Septoria apii (Br. and Cav.) Rost. 

 on the nights of September 9 and 21, following treatments. The celery was 

 boarded on October 7 and harvested on October 19 and 25, at which time leaf 

 counts were made of the two interior rows of each plot. 



Table 3. Relative Effectiveness of Basic Copper Sulfate and Bordeaux in Controlling 

 Early and Late Blights of Celery 



Number 

 Copper of Total Healthy 



Fungicide content appli- leaves leaves Diseased leaves 



cations 



Per cent No. No. No. Per cent 

 Basic copper sulfate 3.84-50. . 0.25 10 



Leaf count Oct. 19 5468 5400 68 1.2i. 



Oct. 25 2310 2258 52 2.25 



Mean 1 .54 



Basic copper sulfate 3.84-50, 



with spreader and adhesive 0.25 10 



Leaf count Oct. 19 4232 4171 61 l.U 



Oct. 25 2272 2200 72 3.1 7 



Mean 2.04 



Bordeaux mixture 4-4-50. . . . 0.25 10 



Leaf count Oct. 19 4054 3960 94 2.32 



Oct. 25 3035 2965 70 2.31 



Mean 2.31 



Check 0.00 



Leaf count Oct. 19 4930 2793 2137 U.S5 



Oct. 25 2366 1467 899 38.00 



Mean 41.61 



