290 The Botanical Gazette. [October. 



CRANDALL, of Colorado, is making a flora of the state, pay- 

 ing particular attention to the native grasses and fruits, and 

 diseases of cultivated crops. 



DETMERS, of Ohio, is studying the life history of the black- 

 berry and raspberry, apple scab and potato blight, and the 

 value of various fungicides. A state herbarium is being made. 



DUDLEY, of New York, has found that the clover rust, prev- 

 alent from New England to the Sierras, is chiefly propagated 

 in the uredo form, and is carried over the winter as mycelium. 

 It was demonstrated that the secidiospores produce uredo spots, 



ifi 



ALcidium Trift 



The rust spores ger 



minate best at a low temperature. As the second crop is most 

 frequently infested, and as this is a valuable fertilizer, it often 

 may be well to plow it under. The ordinary spores of the 

 quince blight [Entomos porium maatlatum) winter on the fallen 

 leaves, not on the tree, so that germinating in early spring 

 they infect the host directly. Therefore all leaves should be 

 burned in autumn. 



GAR MAN, of Kentucky, shows that Bordeaux mixture and 

 eau celeste will check the strawberry blight. • Salt and lime 

 may be used to prevent the growth of the broom rape, but will 

 injure the host plant. Blue stone is satisfactory except its 

 expensiveness. Hot water may be used to kill the broom 

 rape seed, while doing no injury to, but rather benefiting, the 

 hemp seed. Broom rape seed will retain its vitality in the 

 soil for at least ten years. Anthracnose of the grape can be 

 controlled by using blue stone 6\ lbs., lime 3.\ lbs. to 22 gal- 

 lons of water. 



• HALSTED, of New Jersey, is studying sweet potato and 

 egg-plant diseases in particular, and looking after weeds in a 

 general way. 



Harvey, of Maine, in his tests for germination of seeds, 

 finds that a solution of corrosive sublimate of a proper strength 

 to destroy the germs of mould, will injure the vitality of the 



treated seed. Fungicides and weeds are receiving: attention 



HUMPHREY, of Massachusetts, has found the true pycnidial 

 form of the black knot fungus, identified the "damping off" 

 fungus with that causing the same trouble in Europe, added 

 new facts concerning the scab of potatoes, the Peronosporeae 

 of the cucumber and the hibernation of cherry rot. 



JONES (L. R.), of Vermont, during this his first year, is ex- 



