34 MASS. EXPERIMENT STATION BULLETIN 327 



Measurements of the oxygen content of water and of light intensity at 

 different depths were made during the last few days of flooding on a bog near 

 Barnstable which was flooded for 12 days during August. The oxygen content 

 was at no time found to be low enough to cause injury as judged from previous 

 experiments and observations. No immediate injury was noticeable externally 

 after the water was withdrawn. Observations will be made again next June 

 to see if the prolonged flooding affected flower bud formation. 



Spraying and Dusting Experiments. (H. F. Bergman and W. E. 

 Truran. ) Two applications of two mercurial sprays made up either }i or 1 

 pound to 50 gallons of water and applied at the rate of 250-300 gallons per 

 acre were much less effective in controlling rots than two applications of 5-3-50 

 Bordeaux applied at the same rate. The Bordeaux spray reduced the amount 

 of rot to )±- x 2 of that in adjacent check plots. 



On another bog a 25-75 mixture of monohydrated copper sulfate and chemi- 

 cally hydrated lime dusted onto dry vines or the same mixture dusted onto wet 

 vines at the rate of 100-150 pounds per acre gave little or no control of rots. 

 On 7 plots sprayed with a 5-3-50 Bordeaux mixture the amount of rot was 

 reduced to half or less of that in adjacent check plots. Three out of the 4 

 plots dusted wet and the 3 plots dusted dry showed not more than 10-20 per- 

 cent reduction in rot as compared with adjacent checks. The reduction in 

 rot on one of the plots which was dusted when the vines were wet compared 

 favorably with that on plots sprayed with Bordeaux. The application of dust 

 on this plot was 2-3 times as great as on other dusted plots. 



Three commercial fungicidal dusts consisting of monohydrated copper sulfate 

 and chemically hydrated lime plus sticker, and a dust made up of 25 pounds of 

 monohydrated copper sulfate, 50 pounds of bentonite, and 25 pounds of chemi- 

 cally hydrated lime were used on a series of plots on another bog. Two of the 

 commercial dusts contained 20 percent of monohydrated copper sulfate, the 

 third 25 percent. Two applications at the rate of 40 pounds per acre were made 

 on dry vines. Rots were not controlled by any of the dusts. 



In a test carried out on the State Bog in cooperation with Dr. H. J. Franklin, 

 the use of a 40-60 sulfur (300 mesh ) — pyrethrum mixture as a combined 

 insecticide and fungicide proved to be unsatisfactory as a fungicide. Three 

 plots were dusted twice at the rate of 60 pounds per acre at each application; 

 one plot, 40 pounds on the first application, 60 pounds on the second; one plot, 

 one application of 40 pounds; one plot, one application of 60 pounds. Check 

 plots alternated with dusted plots. The yield on all dusted plots, except the one 

 which had only one application of 40 pounds per acre, was noticeably less than 

 that of adjacent check plots. The amount of rot in the berries, at the time of 

 picking, was also greater in all but one of the dusted plots than on adjacent 

 check plots. By the end of October the amount of rot in berries from this plot 

 had exceeded that of the check plots on either side of it. Small local areas of 

 injury to vines were evident in August on some of the dusted plots. The greater 

 amount of rot in berries from dusted plots than in those from check plots is 

 probably due to slight injuries to flower buds and young fruits which favored 

 the invasion of fungi. 



Storage Tests of Cranberries. (H. F. Bergman and W. E. Truran. ) Two 

 applications of 5-3-50 Bordeaux were more effective in controlling rots up 

 to December 1 than other treatment although the degree of control was not as 

 great as has been obtained in other seasons. The loss due to storage rots in 

 berries from most of the plots sprayed with Bordeaux was about half of that 

 in berries from check plots. Two applications of mercurial sprays did not re- 

 duce storage rots more than 30 percent as compared with check plots and in 



