290 PATHOLOGY [BoT. Absts., Vol. X, 



Myzus persicae. The insect alone produces no symptom of mosaic. The disease is different 

 from mosaic of potato. Tests with turnip show that seminal transmission does not occur. 

 [See also Bot. Absts. 10, Entry 1881.]— D. Reddick. 



1889. Takimoto, K. On a bacterial leaf-spot of Antirrhinum majus L. [In Japanese.] 

 Bot. Mag. [Tokyo] 34: 253-257. 1920. — A new leaf -spot disease on snapdragon, cultivated 

 in the field of the Korean Government Agricultural Experiment Station, has been observed 

 since 1918. As a result of repeated inoculation experiments the author ascribes the disease 

 to a yellow organism which he names Pseudomonas antirrhini sp. nov., and which he describes 

 as follows: Cylindrical rod with rounded ends, solitary or in pairs, 0.8-1.2 X 0.3-0 .4/*, motile 

 by 1-4, usually 2, unipolar cilia 3.5-4ju long; no capsules or endospores found; Gram negative; 

 growth on agar pale at first, yellow later; liquifies gelatin; separates the casein from milk 

 and gradually digests it, the culture becoming greenish yellow with age; does not produce 

 gas or indol; slightly reduces methylene blue; reduces nitrates to nitrites; aerobic; thermal 

 death point about 51°C.; occurs on Antirrhinum majus. — For control, the author recommends 

 rotation and 1 or 2 sprayings with Bordeaux mixture. — S. Hori. 



1890. TiSDALE, W. H. Two Sclerotium diseases of rice. Jour. Agric. Res. 21: 649-657. 

 PI. 122-126. 1921. — Sclerotium rolfsii is the cause of a seedling blight of rice [Oryza] in Louisi- 

 ana. Blighted seedlings appear in small areas, and frequently follow the drill rows. Sclerotia 

 are abundant on dead roots and bases of stems. Inoculations made on Honduras rice with 

 S. rolfsii from rice, soybean [Soja], Arrhenatherum elatius, and wheat [Triticum], show that 

 the fungus from rice and wheat is much more virulent than that from tall oat grass and particu- 

 larly than that from soy bean. In the experiments affected plants continued to die until 

 irrigation water was applied, after which all plants not too severely damaged recovered. — 

 Sclerotia of the fungus persist for at least 9 months, and submerged in water for at least 5 

 months. The sclerotia float on water and are thus easily dispersed. The fungus grows 

 vigorously as a saprophyte. — Sclerotium oryzae causes a stemrot of rice in Louisiana. The 

 leaf sheath is apparently attacked first, especially after irrigation water is applied. Subse- 

 quently the stems are attacked and almost completely destroyed. Lodging follows and the 

 panicles do not fill well. The fungus produced infection when introduced into wounds on 

 Honduras rice. The variety Early Prolific is especially susceptible; Japanese varieties are 

 more resistant. — D. Reddick. 



1891. Wahl, VON. Schadlinge an der Sojabohne. [Insect pests of the soybean.] Zeitschr. 

 Pflanzenkrankh. 31: 194-196. 1921. — The principal insect pests are described, and several 

 fungus diseases are incidentally mentioned. — H . T. Giissow. 



ERADICATION AND CONTROL MEASURES 



1892. Anonymous. Bestrijding van de aardappelziekte. [Combating potato blight.] 

 Tijdschr. Plantenz. 26: 172. 1920. — This is a brief warning against an early outbreak of late 

 blight sent out by the phytopathological service. Infection is chiefly on the stalks, but fol- 

 lowing the current dry spell serious spread of the fungus to the foliage is to be expected. 

 Spraying is urged. — H . H. Whetzel. 



1893. Anonymous. La siembra del trigo y los tratamientos de la semilla. [Wheat seeding 

 and seed treatment.] Defensa Agric. [Uruguay] 2: 89-98. 12 fig. 1921.— The bunt disease 

 (Tilletia) of wheat is described, and seed treatment with copper sulphate or formaldehyde 

 is recommended. — John A. Stevenson. 



1894. BiANCHi, Angel T. Enfermedades de la papa. [Potato diseases.] Surco [Argen- 

 tina] 1«: 8-9. 1921. — Dry rot (Fusarium solani) and wet rot (Phj/tophthara infestans) are 

 discussed and control measures outlined. [See also Bot. Absts. 9, Entry 920.] — John A. 

 Stevenson. 



