13 



Now, we have in the far south a bacterial wilt which I don't 

 believe you have in this State. Then we have some of those 

 fungous diseases which cause trouble. With the bacterial wilt 

 it is a question of proper rotation to get that out of the soil. 

 Of course, in the bacterial wilt we have to go a step further 

 and not reinfest the field by using manure composed of the de- 

 cayed vegetables that have had this bacterial wilt. In a lot 

 of our work we have done spraying on cucumbers and have 

 used the Bordeaux mixture. If we can get one composed of a 

 small amount of copper sulphate and a small amount of lime, 

 and have a good pressure, we can get good results. If we use a 

 5-5-50 Bordeaux and apply with a low pressure pump our 

 results are sure to be negative. But where we use a 6-6-50 

 Bordeaux and apply it under 100 or 125 pounds' pressure, and 

 arrange the nozzles of the pump so that we can get under the 

 inside of the foliage, we have been able to hold up the cucum- 

 bers for weeks. 



Mr. H. F. ToMPSON. I would like to ask Professor John- 

 son about the apparatus that is used for applying the Bor- 

 deaux mixture. 



Professor Johnson. We have not been able to buy a satis- 

 factory machine on the market for that purpose. There are 

 several types of spraying machines that are used, any of which 

 give good high pressure, but they are usually two-gear ma- 

 chines, geared to wheels. We use them so as to have three 

 nozzles play on a row^ of cucumbers, two nozzles set so as to 

 play in at an angle, and a third one to play on the top of the 

 row. And we arrange those so as to spray two rows of cucum- 

 bers each time the machine goes across the field. Some of our 

 farmers have spray pumps that will hold up a hundred pounds 

 of pressure under nine nozzles, ^ these large type of nozzles. 

 Where they use nine nozzles it usually takes about 125 gallons 

 of liquid to spray an acre of ground, and we have to have spray 

 pumps that will sustain 125 pounds' pressure. 



Question. How early is that spraying done? 



Professor Johnson. The spraying is usually started when the 

 vines are 16 or 20 to 24 inches long. I don't like to wait after 

 24 inches, and don't start before 16. The spraying has a slight 

 tendency to delay the first setting of the cucumbers, that is, it 



