PREVENTIVE AND REMEDIAL MEASURES. 51 



ISOKDKAl X MlXTrUK. 



In the spraying exporinicnts pints were solectod where from 75 to 

 100 per cent of the wop liad been lost by disease in former years. 

 In the experiments of 1!)04 four ajiplications of Bordeaux mixture 

 were made durinfj the season. In order to determine accurately the 

 results, alternate plats were left unsi)rayed. as a check. Accordino: 

 to actual counts of the sound and diseased berries made at i)ickiu«; 

 time, from September 8 to IH, on 8.")-yard-s(iuare plats, representing 

 the average condition of the sprayed and unsprayed areas, it was 

 found that the greatest percentage of diseased fruit on any of the 

 sprayed plats was 27.5, as against 100 i)ei- cent on tlu' unsprayed plats. 

 The minimum amount of disease on any of the si)rayed i)lats was 13 

 per cent, as against 89 i)er cent on the check i)lats. The average num- 

 ber of diseased berries on all the sprayed jilats was 21.7 per cent 

 and on the unsprayed i)lats 70.8 per cent, and in addition to the i)ro- 

 tection of the fruit from diseases the general vigor and appearance 

 of the sprayed plants was noticeably improved. 



These experiments, owing to circumstances beyond our control, were 

 not entirely satisfactory, as the applications of the fungicide were 

 not made with suilicient frequency and at the most desirable time. 

 In li>()5 a more thorough and satisfactory series of experiments was • 

 conducted ui)on the same plats. The water was removed from the 

 bog May 10 to 12. It is the usual practice of cranberry growers to 

 flood the bogs from twenty-four to thirty-six hours during the first 

 week in June, in order to destroy insects. It had been i)lanned to 

 spray part of the experimental plats before this second flooding. 

 The water supply of the bog was, however, insufficient for a second 

 flooding, and the relation of spraying to this operation was therefore 

 not determined. Two of the plats were sprayed five times — May 19, 

 June 22. July U, July 31, and August 15. At picking time, Sep- 

 tember 8, accurate counts Avere made of all the diseased and sound 

 berries on small areas which showed the average condition of the 

 fruit on the si)rayed plats. Counts Avere also made on equal areas 

 showing the average condition of the fruit on the check plats. As a 

 result of these counts it was found that there was an average of only 

 6 per cent of rotten fruit on the sprayed plats, while there was a little 

 more than 91 per cent rotten on the unsprayed plats. Two other plats 

 sprayed five times, but beginning June 2 instead of May 19. showed 

 as a result of the counts made as in the experiment just mentioned 

 an average of 2. 30 per cent of diseased berries on the sprayed plats 

 and 92.06 per cent of diseased fruit on the unsprayed plats. This 

 appears to indicate that the application made on June 2 was more 

 beneficial than that made at the earlier date, May 19. 



110 



