104 PATHOLOGY [Bot. Absts., Vol. V, 



764. Rumbold, Caroline. Effect on chestnuts of substances injected into their trunks. 

 Amcr. Jour. Bot. 7: 45-56. 2 pi. 1920.— See Bot. Absts. 5, Entry 965. 



765. Schander, and Fritz Krause. Die Krankheiten und Schadlinge der Erbse. 

 [Diseases and insect pests of peas.] Flugbl. Abt. Pflanzenkr. Kaiser Wilhelms-Inst. Landw. 

 Bromberg 29-30.— July, 1918. 



766. Schroder, P. Ein flacher Hexenbesen. [A flat witches' broom.] Mitt. Deutsch. 

 Dendrol. Gesell. 1918:290. / pi. 1918. — On a spruce tree, 35 years old, growing at Hohen- 

 Luckow (Mecklenburg) there is a broom 1.45 m. across and flat in form. [Through absts. by 

 Matotjs check in Zeitschr. Pflanzenkr. 29: 200. 1919.]— D. Reddick. 



767. Speare, A. T. Further studies of Sorosporeila uvella, a fungous parasite of noctuid 

 larvae. Jour. Agric. Res. 18: 399-439. PI. 51-56. 1920.— See Bot. Absts. 5, Entry 684. 



768. Spieckermann. Schadigung der Kulturpflanzen durch zu hohen Sauregehalt des 

 Bodens. [Injury to cultivated plants through too high acidity of soil.] Landw. Zeitg. Westfalen 

 u. Lippe 1918: 255-256. 1918. — Superphosphate and sulfate of ammonia had to be used for 

 fertilizer instead of the customary Thomas slag and nitrate of soda. Rye, oats and potatoes 

 showed injury. The soil was found high in acidity and the lime content greatly reduced. 

 [Through abstr. by Matouschek in Zeitschr. Pflanzenkr. 29: 198. 1919.] — D. Reddick. 



769. Stevens, H. E. Citrus scab. Florida Grower 21 l : 9. 1920. — Description and 

 etiology of the disease with recommendations for control by spraying. — H. R. Fulton. 



770. Uzel, H. Rotfaule der Zuckerriibe. [Red rot of sugar beet.] Zeitschr. Zuckerind. 

 Bohmen 43: 138-139. 1918.— Red rot (Rhizoctonia violacea) occurs mostly in wet fields. Dis- 

 eased plants should be removed and destroyed. Land should be drained and quick lime 

 worked in. It should not be planted to sugar beet, fodder beet, alfalfa, red clover, serradella, 

 potato, asparagus, or fennochio as these plants are attacked by the fungus. Mycelium from 

 rotten beets passes with wash water to compost and back to land. Mycelium also may winter 

 in the wash tanks. Rotten beets can not be used for feeding as the fungus persists in manure. 

 [Through abstr. by Matouschek in Zeitschr. Pflanzenkr. 29: 213. 1919.]— D. Reddick. 



771. Vincens, F. Maladies de l'Hevea dues au Diplodia. [Diseases of Hevea due to 

 Diplodia.] Bull. Agric. Inst. Sci. Saigon 1: 321-329. 1919. — A general discussion of diseases 

 of Hevea caused by Diplodia, with preventive treatment and remedies. — E. D. Merrill. 



772. Winston, J. R., and W. W. Yothers. Bordeaux-oil emulsion. Florida Grower 

 23 3 : 9. Jan. 18, 1920. — Directions are given for combining Bordeaux mixture and oil emul- 

 sions. Experimental results are reported of the successful use of this combination spray 

 against certain insects and fungous diseases of citrus. — H. R. Fulton. 



773. Wormald, H. A phytophthora rot of pears and apples. Ann. Appl. Biol. 6: 89-100. 

 PI. 3, 2 fig. 1919. — Phytophthora cactorum was obtained from pears and apples in England. 

 The fruit often fell prematurely. Inoculation experiments demonstrated the pathogenicity 

 of the fungus. In one case after inoculation the hyphae were found to invade the seeds of 

 pear. One experiment suggested that zoospores might cause infection through the uninjured 

 skin of the pear. — The sporangia germinated either by germ tubes directly, by zoospores 

 which escaped rapidly with the hyaline plug of the sporangium forming a vesicle around them 

 at first, or by production of germ tubes by the zoospores within the sporangium. — The zoo- 

 spores appeared to utilize the anterior cilium as the organ of locomotion. — Oospores were 

 found. Measurements are given of the various spores and sporangia. — The fungus obtained 

 from either apple or pear would rot both fruits. — Sanitation and spraying are suggested as 

 control measures. — G. R. Bisby. 



