440 State Horticultural Society. 



All infected plants should be burned. Bordeaux mixture does little 

 good in checking the ravages of this disease. The rust will not grow 

 upon certain varieties of beans. Only these varieties should be planted 

 upon a field where infected plants formerly grew. 



ORANGE RUST OF BLACKBERRIES, DEWBERRIES AND RASPBERRIES. 



Gymnoconia intcrstitialis (Schl.) Lagcrh. Cacoma iiitciis. 



The orange rust gets its name from the color of its spores. It has 

 the spring, summer and winter spores ; but the last two are not very 

 noticeable. The spring spores are very conspicuous. The cluster-cup 

 stage differs from the same stage on other plants in not being produced 

 in a cup beneath the epidermis. The fungus threads grow erect from 

 the mycelium, burst the epidermis and allow its orange yellow spores 

 to escape. The pustules are found on the under surface of the leaves 

 and upon the stems. 



The mycelium spreads throughout the plant. It lives in the roots 

 during the winter. Infected vines should be dug and burned. Spraying 

 with Bordeaux does little good. 



ASPARAGUS RUST. 



Pnccinia asparagi D. C. 



This is a very destructive disease, living in the plant tissue. It so 

 weakens the plant as to prevent sufficient food from being stored up for 

 the succeeding year. 



It has the spring, summer and winter spore stages. The spring 

 spores are usually not very abundant. They are of a bright orange 

 color, and are borne in small cups which are clustered on the lower 

 parts of the stem. Their position on the stem is due to the infection 

 of the stem by the winter spores from the ground rubbish. In July and 

 August the reddish brown summer spores appear in the roundish to 

 elongated pustules. These and the black winter spores, which appear 

 later in much elongated pustules, are very numerous. It is the pro- 

 duction of these that enfeebles the plant. 



All infected parts and plant remains should be burned. Resin, 

 Bordeaux and sulphur have been used successfully in combating the 

 disease. Irrigation has also been employed as a preventative. 



