No. 2, September, 1921J PATHOLOGY 145 



the stalks decayed. The disease is known only from Washington, D. C, and Urbana, Illinois. 

 The cause of the disease is Bacterium cannae n. sp., group number 211. 3333023. Cultural 

 and other biological characters are presented in detail. Infection takes place through sto- 

 mates and spreads through the intercellular spaces of the parenchyma of leaf blade, petiole, 

 and stalk. Overcrowding and overwatering of young plants in the hothouse seem to be 

 predisposing factors. Avoidance of these conditions is at present the only known means of 

 controlling the disease. — D. Reddick. 



922. Gardner, Max W., and James B. Kendrick. Bacterial spot of tomato. Jour. 

 Agric. Kes. 2V: 123-150. PI. 2^-28, 1921. — Bacterial spot of tomato [Lyropersicnm] is widely 

 distributed in North America. It is a typical spot disease of fruit, stem, and leaf. It occurs 

 on practically all varieties of tomatoes and also on pepper [Capsicum]. Infection of potato 

 foliage has been secured. The disease is caused by Bacterium exitiosum n. sp., group number 

 211. 3332513. Cultural and other biological characters are described in detail. The organism 

 produces no acid or gas with carbohydrates, is highly sensitive to sunlight, very resistant to 

 desiccation, and has its limit of acid toleration at Ph5. — Infection of foliage is stomatal 

 and is readily secured by atomizer inoculations; fruit infections occur only through wounds. 

 Mature fruits are not infected and this is attributed to high aciditv. The organism overwin- 

 ters on the surface of seed and is thus disseminated. Disinfection of seed in mercuric chloride, 

 1 to 3000, for 5 minutes is safe and effective for control. — The paper is a monographic treatise. 

 — D. Reddick. 



923. Gentner, Georg. Eine Bakteriose der Gerste. [A bacteriosis of barley.] Cen- 

 tralbl. Bakt. II. Abt. 50: 428-441. Fig. 2. 1920. — A monographic treatise on a bacterial dis- 

 ease of barley, occasionally fovmd on wheat and rye. The disease is characterized by the 

 appearance of brown spots on the nodes and upper internodes. The leaves of diseased plants 

 are covered with brown blotches or dots, the upper ones becoming prematurely yellow and dry. 

 The disease is further characterized by the production of poorly filled heads with prematurely 

 filled kernels. The glumes may become split. In extreme cases, the kernels may show 

 longitudinal rifts extending deep into the endosperm. The disease is caused by Bacillus 

 cerealium n. sp., described as follows: Short, motile rod, 1.5-3 X 0.6-0.8^, with 1-2 polar 

 flagella; spore forming, aerobic, non-liquefying, red-pigment producing on media. The 

 bacillus is capable of dissolving the middle lamella, starch grains, and cell walls in the interior 

 of the kernel, but not in the hull. It does not dissolve cellulose of filter paper, nor does it 

 rot potato or carrot. The cleavage products and the pigment produced are dextrin-like. 

 The disease is most common in dry seasons. The organism persists in the soil and in the grain, 

 which under conditions of moist storage maj' become seriouslj^ infested. — Anthony Berg. 



924. Heald, F. D. Moldy core of Stayman Winesap, [Abstract.] Phytopathology 11 : 

 105. 1921. — Several species of fungi have been found producing a moldy growth in the core 

 of apples having an open calyx; but of these only species of Penicillium and of AUernaria 

 produced a decay of the fruit. — B. B. Higgins. 



925. HoTSON, J. W. A new species of Exobasidium. [Abstract.] Phytopathology 11: 

 lOvi. 1921. — A new, as yet unnamed, species of Exohasidium attacks the 5'oung branches 

 of Vaccinium parvifolium. — B. B. Higgins. 



920. Jagger, Ivan C. Bacterial leafspot disease of celery. .Tour. Agric. Res. 21: 185- 

 188. PL JfG-I^l. 1921. — The disease is practically confined to leaf blades of celery [.4. pi urn 

 graveolens] and is known from New York and Michigan. The lesions are distinguishable from 

 those of Septoria leaf blight only by the absence of pycnidia. The cause of the disease is 

 Pscudomonas apii n. sp., group number 211. 2322033. Cultural and other biological charac- 

 ters are presented in condensed form. — Field experiments show that the disease may be 

 controlled by suitable applications of Bordeaux mixture, 1 per cent, but that lime-sulphur 

 solution, 1:25, is not effective. — D. Reddick. 



