No. 1, Au(;usT, 19211 PATHOLOGY 05 



mended in Nova Scotia. The Bordeaux gave satisfactory results in scab control and increased 

 yield in the case of Mcintosh and Northern Spy, especially tlic former. 10 i)er cent russet- 

 ing occurred in Mcintosh; the amount was negligible in Northern Spy. Foliage was better 

 throughout the season on the Bordeaux plot. Sulphur dust, with arsenate of lead added for 

 one ai)plication only, gave very poor results, the percentage of scab being as high as 89 on 

 Mcintosh. Sander's "Copper dust" gave good results under similar conditions. — J. W . 

 Easthain. 



433. Fantini, Nicolas. La antracnosis y medics de curacion. [Anthracnose and its 

 cure.] Defensa Agric. [Uruguay] 1 : 179-180. 1920. — Popular discussion of grape anthracnose 

 {Gloeosporium ainpclophagum). — John A. Stevenson. 



•134. Fkomme, F. D., G. S. Ralston, and J. F. Eheart. Dusting experiments in peach 

 and apple orchards in 1920. Virginia Agric. Exp. Sta. Bull. 224. 12 p., 1 fig. 1921. — A sulphur 

 tlusting mixture (80 parts sulphur, 10 parts hydrated lime, 10 parts arsenate of lead) gave very 

 satisfactory control of peach scab, but the data on brown-rot were insuflBcient to furnish a 

 basis for conclusions. Severe cracking of peach fruits resulted from excessive applications 

 of the dust. Three dusts were used on apples: Sulphur dust, copper-lime dust, and Bor- 

 deaux dust. The 1st proved much more effective in the control of apple scab than either of 

 the other 2 mixtures, and gave results almost as good as those obtained on the spray plots. 

 Neither of the copper dusts proved at all effective in the control of bitter-rot on apples. A 

 comparison of the results of the season's tests with those of previous years in Virginia is 

 included. — F. D. Fromme. 



435. Giaccone, V. Como curar el duraznero en primavera y principio de verano. [Treat- 

 ment of the peach in spring and early summer.] Defensa Agric. [Uruguay] 1: 293-294. 2 fig. 

 1920. — Treatment for Exoascus deformans and Aphis persicae is given. — John A. Stevenson. 



436. Hardenburg, E. V. Seed potato problems. Potato Mag. 3'": 22-23, 25, 30. 1921.— 

 Variety tests require several strains from a variety group that has been found suitable locally. 

 Careful attention may prevent degeneration. Seed certification helps to supply good seed 

 because of its effect in controlling leafroll and mosaic. For 5 or more acres, an isolated seed 

 plot is desirable. Usually not enough seed per acre is planted. — Donald Folsom. 



437. Martin, William H. A comparison of inoculated and uninoculated sulfur for the control 

 of potato scab. Soil Sci. 11: 75-85. PL 1, fig. 1-3. 1921. — Uninoculated commercial flour 

 sulphur and commercial flour sulphur inoculated with 1 per cent of soil from a compost heap 

 known to contain sulphur oxidizing organisms, was added to the soil just before planting po- 

 tatoes in scab infested land. Hydrogen-ion exponents of soil samples taken from plots treated 

 with inoculated sulphur were lower than of those treated with uninoculated sulphur. In 

 most instances the increase in acidity was accompanied by a corresponding decrease in the 

 number of unsalable scabby potatoes. [See also following entry.] — IF. J. Robbins. 



438. Martin, William H. Relation of sulfur to control of potato scab. Potato Mag. 

 3": 5-0, 22-23. ^fig. 1921. [See also preceding entry.] 



439. N [orris], F. de la M. Notes on the field-treatment of mouldy rot. Agric. Bull. 

 Federated Malay States 8: 113-llG. 1921. — ^Mouldy rot is a disease of the tapped surface of 

 the Para rubber tree, Hevea brasiliensis, one of the causes of which is a fungus assigned to 

 the genus Sphaeronema. Cleanliness of tapping knives and disinfectant paints appear to 

 check it.—/. //. Burkill. 



440. Porter, H. H. A two-minute treatment of seed potatoes. Potato Mag. 3': 8-9. 

 2 fig. 1921. 



BOTANICAL ABSTBACTS, VOL. IX, NO. 1 



