ANNUAL REPORT. I04O 49 



stored carbohydrates during late fall and early winter and the probability 

 of injury to vines from oxygen deficiency during the winter flooding 

 period, and also on the relation ni oxygen deficiency during the winter 

 flooding period to the setting of fruit during the following sunnner. 



Spraying Experiments for the Control of Rosebloom. (H. F. Bergman.) 

 The following spray mixtures were applied June 20, 1940, on duplicate 

 plots at the rate of 250 gallons per acre: bor.leaux 40-4-100 and 8-8-100 

 each with 2 pounds of rosin-fish oil soap; basic copper arsenate 5-100 and 

 6-100; and yellow cuprocide 1>M00 and 2-100. 



Bordeaux 10-4-100 and basic copper arsenate 5-100 and 6-100 gave com- 

 plete control. Six days after the plots had been spra>ed onl\- a few living 

 diseased shoots were found on plots spra.\od with an\' one ot these mix- 

 tures. Bordeaux 8-8-100 was considerably less efTectivc than the 10-4-100 

 or than the basic copper arsenates, ^■cllow cuprocide I'j-lOO and 2-100 

 were still less eflfective than bordeaux 8-8-100 and gave probablv not more 

 than 50 percent control. 



Spraying Experiments for Cranberry Fruit Rot Control. (H. F. Berg- 

 man.) Spray tests were run on three bogs. The plots, the number of 

 applications, and the time and rate of application were the same as in 1939 

 (See Bulletin 369, p. 40). The results are given in the table. 



Table 1. The Effect of Some Fungicides on the Control of Rots on 

 Four Different Cranberry Bogs in Massachusetts in 1940 



Number .■Average Percentage of Rot 



and Treatment of 



riots Oct. 1 Nov. 1 Dec. ] 



State Bog S 8 



Bordeaux 10-4-lOn ;{ 



Cuprocidehentonite .S-4-ino L' 



Copper arsenate (basic) 414-IOO ."i 



None (check) h 



State Bog S 14 



Bordeaux 10-4100 3 



Yellow cuprocide 1-lOn 3 



None (check ) 4 



Bog No. 3 



Bordeaux 10-4-100 3 



Cuprocide-bentonite 4-5100 3 



Yellow cuprocide 2100 3 



Copper arsenate (haRic) fi-iOO ...... 3 



None (check) 5 



Bog No. 9 



Bordeaux 10-4-100 3 



Yellow cuprocide 1 i^ -100 3 



Copper arsenate (basic) 6-100 3 



None (check) r> 



The extent to which fruit rots were controlled on diflferent bogs varied 

 widely, apparently according to the density of vine growth. The best 

 control was obtained on bog No. 9 on which the vines are least dense and 

 the poorest on bog No. 3 which has the densest vines. There may be 

 some other factor or factors involved, as somewhat better results have 



