360 Report of the Mycologist of the 



August S. The first picking was done on this date. 



August 13 and 13. Fourth t:^ praying. The third spraying did no 

 injury to the plants. Xeither had there been any injury to 

 either of the two test rows in Plat IV. The unsprayed plants 

 in Plats II and IV were now seyerely attaclK-d by the downy 

 mildew — eyery hill showed the characteristic yellow spots. 

 While on Plats I, III and V only an occasional yellow spot 

 could be found. The test rows in Plat IN" showed more 

 disease than Plats I, III and V but considerably less than 

 the unsprayed plants in Plats II and IV. The test rows were 

 again sprayed as on August 3. Plats I, III and V sprayed 

 again (1-to-ll formula). Bordeaux mixture used, 105 gal- 

 lons. Time, 9 hours. 



August 21. Fifth spraying iegun. On this date the contrast be- 

 tween the sprayed and the unsprayed plats was yery strik- 

 ing. Plats I. Ill and V were perfectly green, in excellent 

 health and producing an abundance of cucumbers; while 

 Plat II and the unsprayed rows on Plat JV were yellow 

 throughout, many leayes were completely dead and picking 

 was practically finished. The test rows in Plat IV showed 

 no injury from spraying, and they were not nearly so badly 

 diseased as the unsprayed rows beside them. Plat V and 

 two rows of Plat III w^ere again sprayed. This time it was 

 thought best to use the l-to-8 formula. A close examination 

 of the sprayed plants showed that the disease was getting 

 started among them and it was feared that the Bordeaux 

 mixture used in the last two sprayings might not haye been 

 strong enough to check the disease. The experiment on the 

 test rows in Plat IV showed that the stronger mixture could 

 be safely used if it were properly prepared. The quantity of 

 Bordeaux mixture used this time was 50 gallons and the 

 time required to apply it, 4 hours. On the night of August 

 21stj there was a heavy rain and on the 22d and 23d drizzling 

 rains fell so that no more spraying was done until the 24th. 



August 24 and 25. Fifth spraying finished. The heavy rains had 

 washed off so much of the Bordeaux mixture that it was 

 deemed advisable to re-spray the plants sprayed on August 



