462 BOTANICAL GAZETTE [JUNE 
locality. The disease is well described and illustrated. The germ causing it, 
Bacillus Olee Arch., was but little studied. Part of a bulletin (Ky., no. 72, 
pp. 9-23) is given to a report on the prevention of potato scab, by H. Gar- 
man. A detailed record of the work in 1896 and 1897 with use of corrosive 
sublimate shows very favorable results, In 1896 flowers of sulfur was also 
used, being placed in the drill with the seed tubers, but gave no benefit. 
‘Blight and other plant diseases,” by C. S. Crandall (Colo., no. 41, pp. 1-21), 
includes a good general account of pear blight, both historical and descrip- 
tive. Less extended descriptions are given of sun-scald and frost-cracks in 
fruit trees, leaf blight of strawberry, orange rust and anthracnose of raspberry 
and blackberry. A finely illustrated and well written bulletin on “Some 
important pear diseases,” by B. M. Duggar (Cornell, no. 145, pp. 592-627, 
figs. 15) describes at length a leaf spot (Sepioria piricola Desm.) that has 
heretofore received little attention. It is especially injurious to budded stock 
of two years or older, and is also prevalent in orchards, attacking only the 
foliage. Sprayings of Bordeaux mixture were found effective. It was 
studied microscopicaily, and also cultivated by the bacteriological method. 
A less extended account is given of leaf blight (Extomosporium maculatum 
Lev.), which has been confounded with the preceding, scab (Fustcladium piri- 
num Fckl.) and blight (Bacillus amylovorus Bur.), with original observations 
in each case and a brief bibliography, Notable results were obtained in 
imbedding and sectioning dense stromal tissues. “Rust and leopard spot, 
two dangerous diseases of asparagus,” are described by W. G. Johnson (Md., 
no. 50, pp. 163-168, figs. 2), and their treatment indicated. The second- 
growth and prevent rust, have no rational basis, It is further shown that potato 
stem-blight (cause unknown) is not contagious, and that spraying cucumbers 
with Bordeaux mixture is especially serviceable against mildew (Plasmopara 
Cubensis). Interesting notes are given on the last named fungus, including a 
first record of its occurrence on Cucumis Moschata Duch. “ Prevalent dis- 
eases of cucumbers, melons, and tomatoes,’ by A. D. Selby (Ohio, no. 89, pp- 
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