196 PATHOLOGY [Bot. Absts., Vol. IV, 



1290. Girola, Carlos D. Maices argentinos y aclimatados : Variedades de Maiz culti- 

 va das en Argentina. [Varieties of maize cultivated in Argentina.] 160 p., 85 pi. Buenos Aires, 

 1919.— See Bot. Absts. 4, Entry 71. 



1291. Greene, Laurenz. Spraying a necessity. Trans. Indiana Hortic. Soc. 1918: 

 161-173. 1919.— Popular. 



1292. Grisdale, J. H. Report of the acting Dominion botanist. Rept. Dominion [Can- 

 ada] Exp. Farms 1917-18: 38-11. 1918. — Administrative report with mention of the work be- 

 ing done in the Field Laboratories of Plant Pathology. — D. Reddick. 



1293. Guba, E. T., and P. J. Anderson. Phyllosticta leaf spot and damping off of snap- 

 dragons. Phytopath. 9: 315-325. 1919. — Symptoms of the disease and cultural characteris- 

 tics of Phyllosticta Antirrhini on Antirrhinum majus are given. Wounding is not necessary 

 for infection. High air and soil humidities favor a severe attack of the fungus. All types 

 of the disease except the damping off may be controlled by the use of Bordeaux mixture 

 (4:4:50).— #. Johann. 



1294. Gfjssow, Hans Theodor. Report of the Dominion botanist. Rept. Dominion [Can- 

 ada] Exp. Farms 1916-17: 40-41. 1918. — Official report of the activities of the department 

 including among other things very brief statements about potato diseases and about club 

 root of crucifers. — D. Reddick. 



1295. Harter, L. L. Sweet potato diseases. U. S. Dept. Agric. Farmers' Bull. 714. 24 

 p., 15 fig. 1919. 



1296. Hartley, Carl, T. C. Merrill, and Arthur S. Rhodes. Seedling diseases of 

 conifers. Jour. Agric. Res. 15: 521-558. PI. B. 1918. — Damping off is the most serious dis- 

 ease of very young seedling conifers. Corticium vagum, Pythium debaryanum and Fusarium 

 monilijorme have proved especially virulent on seedlings of Pinus when grown in heated soil. 

 Other organisms which are believed to cause damping off are Fusarium ventricosum, F. solani, 

 F. spp., Trichoderma spp., Botrytis cinerea and Pestalozzia funerea. Corticium vagum is re- 

 ported from 12 coniferous hosts. One strain, maintained in artificial culture for 8 years, re- 

 tained its virulence. Other strains are practically saprophytes. These differences bear little 

 or no relation to the host from which the strain was isolated. C. vagum was found to be espe- 

 cially virulent on pines grown in a very sandy soil which was first treated with sulfuric 

 acid and this followed by lime. — Numerous fungi were tested and found to lack parasitic abil- 

 ity. — Heavy inoculation on seedlings grown in sterilized soil does not give reliable indication 

 of what goes on in the seed bed. — Corticium vagum and Pythium debaryanum often attack 

 germinating seeds and kill then. — Non-parasitic troubles, with which damping off might be 

 confused, are described and illustrated. — D. Reddick. 



1297. Haskell, Royal J. Fusarium wilt of potato in the Hudson River Valley, New York. 

 Phytopath. 9: 223-260. PL 13-15. 1919. — Tubers from infected vines show the usual brown- 

 ing of the vascular system and also a net necrosis which the author terms Fusarium necrosis. 

 Isolations of Fusarium oxysporum were obtained from the extreme stem end but negative re- 

 sults were reported from the discolored interior tissue. A somewhat similar necrosis was pro- 

 duced experimentally by injections into the rhizomes of growing tubers with toxic solutions 

 such as oxalic acid and a liquid extract of F. oxysporum. The author concludes that Fusarium 

 necrosis may be explained by the presence of toxins. Temperature studies show high temper- 

 atures to be favorable for the parasite and unfavorable for the host. Artificial inoculations 

 of plants growing at 36°C. gave the best results. A distinct correlation was found between 

 the amount of disease in Dutchess County and the factors influencing soil temperatures. Ex- 

 perimental plantings of seed tubers affected with Fusarium necrosis show that the disease 

 may be communicated in this way but plants free from wilt are often produced. "The plants 

 arising from such potatoes however are weak and the yield is small." Spindling sprouts are 



