New York Agricultural Experiment Station. 151 



that the factor of fogs and dews may play a more iiivpoilaiil [lart 

 in the distribution of the rust than' soil conditions. 



The results obtained; in 1898-99 show conclusively, not only 

 in appearance of the sprayed and unsprayed belts, but also in 

 the yield, that spraying not only protected the asparagus from 

 the rust but in addition was a source of profit. Nevertheless, the 

 fact that the area used as a basis was small, allowing factors of 

 error to be exaggerated, lessens the value of these results as a 

 whole. Hence conclusions as to the value of spraying should not 

 be based upon these alone. The resin-Bordeaux adhered fairly 

 well and did not injure the asparagus in the least, although the 

 l-to-8 formula was used in preparing the mixture. 



Observation brought out the fact that only the growth made 

 previous to the appearance of the rust on a field was protected 

 by spraying; that is, a growth that was mature and thoroughly 

 sprayed previous to the attacks of the rust. This observation 

 applies only to the field where every other row was a source of 

 infection. Furthermore it was observed that generally two and 

 sometimes three periods of growth occur in Long Island aspara- 

 gus beds, and for two seasons, 1899 and 1900, we have been 

 unable to save these late growths on the test field. Hence the 

 indications are that, even with spraying, the vitality of the 

 sprayed rows on this field will be gradually reduced. 



As already stated the resin-Bordeaux mixture caused no ap- 

 parent injury to the asparagus. In fact no noticeable injury has 

 resulted from the use of the resin-Bordeaux mixture, used as 

 strong as 1 to 8 during three seasons. 



It was found necessary to use between 250 and 300 gallons of 

 the mixture per acre at each spraying when applied with a barrel 

 pump. In addition it was ascertained that with an ordinary 

 barrel pump with two leads of hose three men could not prepare 

 the mixture and spray over three acres per day. 



Thus far the results show that under the most unfavorable 

 conditions a gain in yield of nearly 50 per ct. can be obtained by 

 spraying, while under more favorable conditions a gain of nearly 

 70 per ct. in yield can result from spraying. Expressing the 



