31 
injury in parts of New Jersey and Long Island and was made the sub- 
ject of study by Dr. B. D. Halsted. 
When the plants are apparently in vigorous growth and full vegeta- 
tion, they are attacked by this disease (Puccinia asparagt DC.), which 
‘appears first as small reddish-yellow points on the main stem near the 
ground and also on the branches and leaves, then, spreading and 
extending into patches and streaks, it covers the whole plant, turning 
at the same time to a red-brown or orange color, which later in the 
season becomes dark colored, and in this form it passes the winter. 
Asa result of the attacks of the spores the leaves fall, and the plants 




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Fic. 11.—Magnified spores of Puccinia asparagi DC.; 1, two sori of summer spores, occupying the 
external tissues of an asparagus stem, magnified 50 diameters; 2, portion of the same, magnified 
196 diameters; 3, portion of a sorus of winter spores, magnified 196 diameters; 4, a sorus of winter 
spores. magnified 50 diameters. (Redrawn; from Twentieth Annual Report Connecticut State 
Agricultural Experiment Station.) 
present a naked appearance (fig. 10). The stalks and branches are 
rough to the touch, granular, and furrowed. Rust attacks asparagus 
plants of all ages, from the seedling in the seed bed to the almost 
exhausted bed of many years’ standing. Neither location of the bed in 
high or low land nor methods of cultivation seem to affect the disease 
to any great extent. 
The earlier or later appearance of the rust is somewhat dependent 
upon the condition of the weather.. At the beginning of a long-con- 
tinued drought in July or August the rust will make its appearance, 
and in high, dry locations the ill effects will be more noticeable than 
in lower lands. 
