404 PATHOLOGY [Bot. Absts. 



2775. Uzel, H. Berichte iiber Krankheiten und Feinde der Zucherriibe in Bohmen und 

 der mit derselben abwechselnd kultivierten Pflanzen im Jahre 1916. [Report on diseases and 

 enemies of sugar beets and their accompanying crops in Bohemia in 1916.] Blatt. Zucker- 

 rubenbau 25: 175-179. 1918. — The greatest loss was caused by beet nematodes, next in de- 

 gree came the damping-off fungi. He reports also Sporodesminm putrefaciens, Phyllosticta 

 betae, Cladosporium herbarum, Cercospora beticola and Uromyces betae. Black aphis, beet 

 beetles and wire worms are reported. Field mice and musk rats damaged the crops. — Caro- 

 line Rumbold. 



2776. Uzel, H. Aus der phytopathologischen Abteilung der Versuchstation fur Zucker- 

 industrie in Prag. [Report of the phytopathological division of the experiment station for the 

 sugar industry in Prag.] Blatt. Zuckerrlibenbau 25: 163-164. 1918. — The sugar beet crop was 

 extremely good. There was some leaf spot (Cercospora beticola). A warning is given that all 

 beet leaves should be cleared from the fields after harvest. Plants infected with leaf spot 

 should not be used as mother beets because the seed may carry spores. Suspicious seed 

 should be disinfected. Beets showing heart rot should not be used as mother beets since 

 such seed may have a tendency to heart rot. All siloed beets should be packed, if possible 

 with "Sulfin" or at least with powdered lime. — Caroline Rumbold. 



2777. Van der Bijl, Paul A. Observations on a fungus — Cephalosporium sacchari But- 

 ler — which causes a red rot of sugar-cane stems. Union of South Africa Dept. Agric. Sci. Bull. 

 11. 1919. — A red rot of sugar cane occurring in Natal is caused by the fungus Cephalosporium 

 sacchari Butler. This disease has been previously recorded from India, Barbados, Trinidad 

 and Leeward Islands. Infection experiments proved the pathogenicity of the fungus which 

 appears to be of the nature of a weak parasite, and spreads slowly through the cane stalks. 

 It is suggested that although the fungus does not produce spores on growing cane these may 

 be liberated in abundance from decaying stalks, and that possibly some of the caneleaf spots 

 may be due to this fungus. The following control measures are suggested: (1) the destruc- 

 tion of infected cane, (2) the avoidance of infected cane when taking sets for planting. — E. 

 M. Doidge. 



2778. Van der Bijl, P. A. A ripe rot of paw-paws. South African Fruit Grower 6: 177. 

 4 fig. 1919. — The disease occurs commonly along the Natal coast, but the causal fungus 

 has not been identified. Removal of dead leaf stalks and spraying with Bordeaux mixture are 

 recommended as control measures.— E. M. Doidge. 



2779. Van der Broek, M., and P. J. Schenk. Zeikten en Beschadigingen der Tuinbouw- 

 gewasse. [Diseases and enemies of garden plants.] 2 ed. J. B. Wolter: Groningen, 1918. 



2780. Van Houten, J. M. The fatality of crown gall in apple orchards. Better Fruit 

 14 4 : 9. October, 1919. — A condensed popular review of Iowa Agric. Exp. Sta. Research Bull. 

 50. — A. E. Murneek. 



2781. Veall, J. J. Black spot of pear. An orchardist's control experience. Jour. Agric. 

 [New Zealand] 16: 288-290. 1 fig. 1918. 



2782. Vincent, C. C. Lime-sulphur summer spray for apple scab. Better Fruit 13 u : 

 9, 24. Tab. 1—5. May, 1919. — Experiments conducted for three years with the use of lime- 

 sulphur as summer spray for apple scab in Northern Idaho has shown that three applications 

 — (1) when blossom buds show pink, (2) when petals fall, and (3) three weeks after petals fall, 

 completely controlled scab on most varieties of apples. Grimes being more resistant to scab, 

 one application, at time the buds show pink, was found sufficient to reduce scab to a negli- 

 gible amount. Experimental data are given. — A. E. Murneek. 



» 



2783. Waterbury, H. E. [Plant diseases and treatments.] Bienn. Rept. Washington 

 [State] Dept. Agric. (3) 1917-18: 84-87. 1918. 



