Page i8 



BETTER FRUIT 



January 



Anthracnose Control on Black Raspberries 



[EniTon's Xiitf,.— Professor W. C. Dutton, of 

 the Micliignn Agricultural College Experiment 

 Station, has recently published a bulletin on 

 "Anthracnose (".onlrol on Black Raspberries." 

 By request of some of our subscribers we are 

 hereby publishing this article, which will be 

 valuable and instructive to many of our 

 readers.] 



THE Horticultural Department be- 

 gan work in 1911 to determine the 

 relative elliciency of various spray- 

 ing materials to control anthracnose on 

 black raspberries. 



In 1914 and 1915 this work was done 

 at Eaton Rapids in a field of Plum 

 Farmer belonging to T. A. Farrand. Tlie 

 bushes were several years old. Proper 

 pruning and cultivation were practiced 

 regularly. 



Four materials, as follows, were used: 



Lime-sulphur. 



Soluble sulphur, a proprietary com- 

 pound manufactured by the Niagara 

 Sprayer Company. 



Copper sulphate solution. 



Bordeaux. 



Each material was used for the differ- 

 ent application as listed below: 



Lime-sulphur— Dormant, 2V-i gallons 

 in 50; summer, 1% gallons in 50. 



Soluble sulphur — Dormant, 10 lbs. in 

 50; summer, 1 lb. in 50. 



Copper sulphate — Dormant, 3 lbs. in 

 50; summer, 1 lb. in 50. 



Bordeaux — Dormant, 4-4-50; summer, 

 4-4-50. 



The rows were forty rods long. Al- 

 ternate rows were sprayed, one with 

 each material. The other rows were 

 left as checks. The arrangement of 

 the plots is shown in the accompany- 

 ing chart. The rows were not sprayed 

 their full length, except the lime-sul- 



phur row, which was sprayed entirely 

 for the dormant application only, as 

 shown in the chart of the plots. 



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G. Unsprayed 

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8. Unsprayed 



9. Unsprayed 



In 1914 three applications were made 

 as follows: 



First, April 4 — Dormant application. 

 Second, May 28 — New shoots about 18 

 inches high. 



Third, August 26— Old canes had been 

 cut out. 



In 1915 three applications were made 

 at the following periods: 



First, April 17 — Dormant application. 

 Second, May 19— New shoots were 

 6 to 10 inches high. 



Third, June 14— Blossoms off. Shoots 

 about two feet high. 



No later applications were made, as 

 the bushes were to be pulled out after 

 the berries were harvested. 



After the last application on August 

 26, the new canes in all plots were ex- 

 amined carefully and canes selected 

 which seemed to be average ones for 

 each plot. The canes from the differ- 

 ent plots were then compared. 



In all plots, sprayed and unsprayed, 

 there was some anthracnose near the 

 tips of the canes. The amount varied 

 in different plots. The unsprayed plot 

 showed most and the lime-sulphur plot 

 least. This condition was probably 

 caused by an infection during a period 

 when the tips of the canes w-ere not 

 covered with spraying material. 



There was a very marked difference 

 in the condition of the lower parts of 

 the canes. The canes in the row- 

 sprayed with lime-sulphur were practi- 

 cally free from anthracnose except a 

 few spots near the tips. The portion of 

 the row which had only the dormant 

 application was in as good condition as 

 the part sprayed three times. 



In the row sprayed with soluble sul- 

 phur the canes showed much more 

 anthracnose than where lime-sulphur 

 was used. Bordeaux mixture gave 

 poorer results than soluble sulphur and 

 the row sjjrayed with copi)er sulphate 

 solution was little better than the un- 

 sprayed row. Practically all the canes 

 in the unsprayed row were quite badly 

 affected. The upper and lower parts of 

 canes showed about the same amount 

 of the disease. 



The condition of the new growth was 

 noted about the middle of August. 



In the unsprayed row nearly all the 

 canes showed some anthracnose, most 

 of them quite badly. The spots were 

 much more numerous near the base 

 than at the tips of canes. 



Three applications of lime-sulphur 

 gave better results than any other ma- 

 terial. The results were uniformly 

 good and very few of the diseased 



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SULPHUR 



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To create additional available plant food, 

 drill into the soil 100 to 400 pounds per acre 

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 for what purpose you use the sulphur. Quantity needed, 

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^ 



