124 TWENTY-FIFTH ANNIVERSARY REPORT. 
(4) Rust,74 a disease caused by a fungus which in one of its 
stages attacks the leaves, fruit and twigs of the apple and in another 
stage inhabits the red cedar producing the so-called cedar apples. 
This work was in co-operation with the lowa Experiment Station 
and its object was to determine why the cultivated apple in lowa is 
exempt from rust so common in New England and on Long Island. 
Definite conclusions were not reached, but it appears probable that 
the exemption of lowa apples from rust is due, in part, to the fact 
that the varieties planted in Iowa are chiefly those which are rust- 
resistant.” 
(5) Belting and russeting of apples due to frost.”® 
(6) A leaf spot caused by the fungus Phyllosticta limitata.** 
(7) Powdery mildew, a fungus disease which is sometimes quite 
injurious to seedlings in the nursery.”° 
ASPARAGUS. 
In New York there is but one really important asparagus 
disease, namely, rust,26 which has been destructive every season 
since its first appearance on Long Island in 1896.27 During 1899 
and 1900 a special investigation was made of rust and its control.”® 
At the outset it was suspected that a spray of bordeaux mixture 
would be effective, but it was found.that ordinary bordeaux does 
not adhere well to the foliage. This difficulty was overcome by the 
addition of resin to the bordeaux. -Another difficulty was the lack 
of suitable machinery for applying the spray, which made it neces- 
sary for the Station to devise an asparagus sprayer. Although the 
results of the experiments showed plainly that rust may be largely 
prevented and the yield and quality of asparagus much increased 
by spraying, Long Island asparagus growers have not adopted the 
treatment. Many have attempted to avoid rust by planting such 
varieties as Palmetto and Argenteuil,; supposed to be rust resistant, 
but the results have been unsatisfactory. The California sulphur 
treatment” has not been tested on Long Island. 
** Gymnosporangium macropus Lk. 
* Rpt. 14:535-544 (1895). 
* Rot. 143544. 
“ Rpt. 143545; 15°454. 
** Rpt. 11:663 (1892). 
*° Puccinia asparagi DC. 
7 Rpt. 15:458 (1806). 
* Bul. 188 (1900); same in Rpt. 19:122-166. 
CAL Sta bulls. aos anit 7 2 : 
