138 MINNESOTA STATE HORTICULTURAL SOCIETY 



ilar results.! The bushes were sprayed six times. Late in November 

 an exainination showed that 'the canes in the treated rows were 

 nearly free from disease, whilst those that were not sprayed were still 

 ver3' badly affected.' 



"Mr. L. T. Yeomans, Walworth, made a similar test this year, under 

 our suggestions, upon Gregg. He sprayed with Bordeaux mixture 

 as follows: May 16; May 20 (repeated thus earlj^, because the first 

 spraying seetned to have hit the leaves more than the canes); May 

 29th; June 7th. On newly set plants these applications were made 

 and also the following additional ones: June 13th; June 17th; June 

 26th; Jul}^ 9th. These applications were made carefully and thor- 

 oughly, but neither Mr. Yeomans nor myself could detect any im- 

 munity from disease on the spraj^ed plants. It should be said, 

 however, that the disease was slight upon all the plants. 



"My associate, Mr. Lodeman, made a similar experiment this year 

 in the university gardens, and his account follows: ' Two varieties 

 of raspberries were selected, Shaffer and Ada, one part of the rows 

 being repeatedly sprayed with Bordeaux mixture. The first appli- 

 cation was made May 18th; this was followed by others on June 13th, 

 June 26th and July 11th. The plants and canes were each time del- 

 viged with the mixture to such an extent that they lost their normal 

 green color and appeared as blue as the mixture could make them. 

 It was found that the canes could not be nearly so well protected as 

 the leaves, as the liquid refused to adhere to the glaucous surface; 

 it collected, however, upon the ends of the thorns, giving them a 

 marked blue tip.' 



"'Some plants of both varieties received only the two applications 

 made in June, while certain Shaffer plants remained untreated. 

 Notes taken August 2d and 28th show that the fungicide had been 

 of some value in checking the anthracnose, but the effects were not 

 so marked as was desired. The canes of the unsprayed Shaffer were 

 very much pitted, the older and larger ones being considerably 

 swollen and bent in places. The smaller canes as well as the leaves 

 also showed an abundance of infected places. The portions of the 

 rows which received the two treatments in June were not in much 

 better condition than the untreated plants. The lower portion of 

 the canes was severely attacked, and although the number of pits did 

 not appear to be so abundant, still all parts of the plants were more 

 or less affected. The bushes receiving the greatest number of treat- 

 ments were the most healthy, but the benefits derived from the 

 fungicide were not sufficiently marked upon either variety to en- 

 courage a grower to repeat the same line of treatment. Some pro- 

 tection was undoubtedly afforded, and the plants were plainly in 

 better condition than their untreated neighbors, yet the use of the 

 Bordeaux mixture during the growing season cannot be recom- 

 mended as being of much practical benefit. If the bushes are to be 

 sprayed, the first application should be made as soon as the new 

 canes appear, and these should be kept covered as well as possible. 

 If some more adhesive material than the Bordeaux mixture were 

 employed, better results would probably follow.' 



t FJull. 81, Xevv York State (Cieneva) Exp. Sta. '>!»•-• (1S94). 



