150 Report of the JJutamst of the 



stages and does not mjure tlie vegetative portion or iliat which 

 answers as the root system of the rust. As yet it has not been 

 shown that the Darluca ever attacks the thick-walled winter 

 spores. Hence the indi(h(ions a*e that Darliwa will not exter- 

 minate the rust nor even act as a material check, especially where 

 a;4paragus is grown in large quantities. 



Dr. Pammel-s states that Darluoa has more delicate spores than 

 the rust and is more susceptible to the spray of the fungic:ide. 



During the past three years no appreciable difference in the 

 amount of Darluca, on sprayed plants which had become rusted 

 and on unsprayed rusty plants, has been observed. 



CONCLUSIONS. 



All three stages of the asparagus rust occur in New York State. 

 The first stage is usually found on seedling and neglected beds 

 only. The uredo and teleutospore stages can both be found on 

 the same plant at the same time whether it be June or October. 

 Furthermore both stages may occur together in the same rift or 

 sorus. 



Cutting and burning too early in the fall is injurious. Late 

 burning admits of scattering of the spores, and combined with 

 this is the ever present fact of neglected fields and volunteer 

 asparagus as a source of infection; hence it is a question whether 

 burning is a profitable or even a practical method to follow in 

 combating asparagus rust. 



Thus far no variety of asparagus has entirely withstood the 

 attacks of the rust in this State. In instances where one variety 

 has shown slight advantage.* it was questionable whether th.e 

 difference was not due to age or surrounding conditions instead 

 of to any inherent qualities. 



Although Messrs. Stone and Smith assert that there is a 

 variation in the distribution and attacks of the rust due to differ- 

 ent soil conditions and that the uredo stage is limited to sandy 

 soils in Massachusetts, no such variations have been observed i-i 

 this State. Furthermore it appears from conditions found here 



»Iowa Agr. Exp. Sta., Bui. 53, p. 64, 1900. 



