824 EXPERIMENT STATION RECORD. 



elevations of the same color as tlie leaf, but as the spores mature they 

 become amber colored and rise prominently from the leaf. Inocula- 

 tions under a bell jar gave within 10 days well-developed pycnidia on 

 healthy leaves. As a rule it is only the old leaves that are affected 

 and these should be burned. Bordeaux mixture may prove effective 

 against this blight. 



Club root of cabbage and its allies (pp. 332-345). — This is a reprint of 

 Bulletin 98 of the station (E. S. E., 5, p. 685). 



Soil rot of sweet potatoes (i^p. 345, 34G). — A report is given of some 

 field experiments conducted with the view of checking the soil rot of 

 sweet potatoes. Series of rows of plants growing in infested soil were 

 treated as follows : 



" (1) On May 13, 2 rows while still open and before manuring, were sprayed tlior- 

 oughly with the Bordeaux mixture. 



"(2) On May 13, 2 rows sprayed as in 1 after the manure had been placed. 



"(3) Two rows left untreated. 



"(4) On May 13, 2 rows sprayed after they were made up and before setting the 

 plants. 



"(5) On May 20, 2 rows with the plants sprayed directly after setting. 



"(6) On August 10, 2 rows sprayed after the plants had run vines 18 to 20 in. long." 



The results obtained showed "that spraying the rows before the 

 addition of manure is the better way of treating the ground for the 

 prevention of the soil rot of the sweet potato." There appears, from 

 the tabulated results given, a gradual increase in the amount of soil rot 

 present from the first series to the last. 



Identity of the anthracnose of the bean and watermelon (pp. 347-352). — 

 The author reports having inoculated citrons on opposite sides of a 

 line with spores from the bean and watermelon. Both inoculations 

 grew rapidly and no differences could be detected, proving the identity 

 of the two diseases. The author reviews the synonymy of the fungus 

 and concludes the name should be Colletotrichum lagenarium. 



Fungus diseases of the muslmelon (pp. 352-35G). — Mention is made of 

 three of the more important diseases of the muskmelon. The first is a 

 downy mildew {Plasmopara cubensis), similar to the downy mildew of 

 the grape and amenable to the same treatment. The second is of a 

 bacterial nature. Parts of the plant, as the stem, petioles, or leaf 

 blades, when attacked have a peculiar watery aiipearance. The author 

 thinks it probable that the germs of this disease may be carried over 

 from year to year in the soil, and probably several crops may be affected 

 by the same disease. Spraying is thought to check the disease. The 

 third trouble is a leaf spot due to a species of Phyllosticta. It is con- 

 fined to the leaves and younger parts of the vine, and it seems very 

 probable that it could be controlled by spraying with any of the more 

 common fungicides. 



Some fungus diseases of the pea (pp. 357-362). — Several fungus enemies 

 of the pea are described, the more important being pea mildew {Erysiphe 

 martii), pea rust {Uromyces appendiculatus), pea blights {Ascochyta pisi 



