GREENHOUSE CUCUMBERS 



97 



Mr. Work: Would it seem that spraying would be effec- 

 tive with bordeaux? 



Mr. Jagger: It would seem probable. 



Mr. Work: What is the method of infection? 



Mr. Jagger: Spore infection through the air. 



Mr. Work: Bordeaux is the thing to try, but make it 

 thorough. Have you done it? 



Mr. Wrigley: We have. It is not very effective. Bor- 

 deaux affects the yield, I think. 



Mr. Work: It injures the foliage? 



Mr. Wrigley: The vines, after they are covered with 

 hordeaux, do not seem to yield for a couple of weeks. 



Mr. Jagger: I do not know that any work has been done 

 on that point with cucumbers. 



Mr. Work: In putting the bordeaux on, you are probably 

 closing some of the air openings. 



Mr. Jagger: With potatoes it is just the other way. It 

 increases the transpiration. 



Mr. Zuck : If you control the house properly with regard 

 to air, that is one of the great preventives of leaf disease. 



Mr. Work : How about keeping moisture in the air for 

 the cucumbers? 



Mr. Zuck: I do not know that it is absolutely necessary. 

 We water our vines a couple of times every week rather 

 lightly. 



Mr. Work : Do you try to keep the atmosphere in the 

 greenhouse fairly moist? 



Mr. Zuck : More so than for tomatoes. 



Mr. Work : It is a case of getting moisture into the air 

 and changing the air. It is like ventilation. We do not 

 want to get the heat down and yet we must get ventilation. 

 It seems to be the idea among growers under glass that clos- 

 ing the ventilators is very poor economy. 



Mr. Grannell: Do you use the overhead wire supports 

 before you put the string on? 



