New York Agricultural Experiment Station. 371 



gallons, being held in place on the back by straps over the 

 shoulders. They are furnished with force pumps that have a 

 large air-chamber, making the discharge constant. In the later 

 patterns the pump handle is so arranged that it can be made to 

 work over either shoulder, so that the pumi)ing may be done by 

 either hand. 



" In purchasing a knapsack care should be taken to select one 

 in which the discharge pipe enters the tank at the top. If it 

 enters at the bottom it invariably becomes clogged in a short 

 time where heavy mixtures are used, so that it is a constant 



source of annoyance When furnished 



with a Vermorel nozzle the knapsack is a very efficient sprayer. 

 They can be obtained of most dealers in spraying apparatus at a 

 price ranging from ten to fifteen dollars." 



Spraying with a knapsack sprayer is hard work and slow, but 

 the knapsack can be used in a great many, cases where it would 

 be inconvenient and perhaps impossible to use either a barrel 

 spray-pump or a power sprayer. On account of the habit of 

 growth of cucumbers and melons, a sprayer on wheels can not be 

 used for spraying these plants except, perhaps, in the manner to 

 be described a little later; hence the knapsack sprayer, in spite of 

 its tediousness, is sure to find favor among those who grow cu- 

 cumbers and other vines which require spraying. It is so useful 

 for applying fungicides and insecticides to various field and 

 garden plants that every farmer should have one even if he has 

 also a barrel spray-pump. 



Some of the large growers insist, however, that an easier and 

 more rapid method should be found. To such persons we make 

 the following suggestions: 



Plant the cucumbers in strips of from six to nine rows eacl), 

 leaving between the strips open spaces of from twelve to thirteen 

 feet in width. In the center of each open space plant two rows 

 of late cabbage, cauliflower, or some other low-growing plant. 

 The following diagram shows the plan of a field planted in this 

 manner : 



