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



1254. Roberts, John W. The age of brown-rot mummies and the production of apothecia. 

 Phytopathology 11 : 17G-177. 1921. — Mummies of both peaches and plums decaj'ed during the 

 summer by Sclerotinia cinerea produced apothecia the following spring. — B. B. Higgins. 



THE HOST (RESISTANCE ; SUSCEPTIBILITY ; MORBID ANATOMY AND 



PHYSIOLOGY) 



1255. Allen, Ruth F. Resistance to stem rust in Kanred wheat. Science 53: 575-576. 

 1921. — A cytological study of Puccinia graminis tritici showed that when the urediniospores 

 germinate, the germ tubes form appressoria at the opening of the leaf stomata. With Kanred 

 wheat, only 10 per cent of rust inoculations were effective, though the appressoria were numer- 

 ous. Measurement of stomatal slits in Kanred and Mindum wheats (the latter a less resistant 

 type) showed that the openings in the Kanred variety are extremely long and narrow and those 

 of the less resistant type are short and twice as wide. — C. J. Lyon. 



1286. FoETUN, G. M., t S. C. Bruner. Investigaciones sobre la enfermedad del "mosaico" 

 "rayas amarillas" de la cana de azucar. [Investigations on the mosaic of sugar cane.] Rev. 

 Agric. Com. y Trab. [Cuba] 3: 441-445. Ifig. 1921. — Fifty-two varieties of healthy sugar cane 

 were planted in rows adjacent to mosaic sugar cane. At the end of 5 months all the varieties 

 except the Uba, Japonesa, and Cayana, were more or less diseased. Tables are given showing 

 the rate of infection and the total number of healthy and diseased stocks in each variety at 

 the end of the experiment. — F. M. Blodgett. 



12S7. Lee, H. Atherton, The relation of stocks to mottled leaf of citrus trees. Philip- 

 pine Jour. Sci. 18: 85-93. PI. 1-3. 1921. — Experiments in the Philippines demonstrated 

 that trees upon pumelo stock were badly affected with mottled leaf, while those on mandarin 

 orange and calamondin stock were unaffected under the same conditions. The relationship 

 of stock is not advanced as a cause of the disease, but the use of certain stocks is believed to 

 predispose to the disease when the causal factors are present. — Albert R. Sweetser. 



1288. Pantanelli, E. Sui rapporti fra nutrizione e recettivitfi per la ruggine. [On the 

 relation between nutrition and receptivity to rusts.] Riv. Patol. Veg. 11: 36-54. 1921. — 

 Pot and water cultures of wheat, oats, corn, and beans were grown with different nutrients 

 to determine their respective receptivity to Puccinia glumarum tritici, P. coronata, P. sorghi, 

 and Uromyces fabea. Special attention was paid to nutrition, activity of the roots, and com- 

 position of foliage at the time of attack. In general the better growing and better nourished 

 plants were more receptive. An excess of phosphate in relation to nitrogen increases resistance 

 only when it checks growth, whereas a phosphate nutrition proportional to the nitrogen nutri- 

 tion and resulting in a regular growth has no influence on receptivity. Increased concentration 

 of the liquid around the roots diminishes receptivity because it depresses the absorbent activ- 

 ity of the roots, not because it increases the osmotic pressure of the cell sap in the foliage; the 

 latter does not appear to have a relation to receptivity. Probably the concentration of the 

 organic substances of the sap is of importance, and it appears that the more the free acids 

 increase in relation to the basic molecules, the greater the resistance. The most receptive 

 organs are richest in sugars, in acids with large molecules, and in soluble compounds of phos- 

 phorus and nitrogen. — F. M. Blodgett. 



1289. Pinellb, J. Degats causes a la vegetation par les usines. [Damage to vegetation 

 caused by factories.] Jour. Soc. Nation. Hort. France 22: 50-51. 1921. — This is an account of 

 injury to vegetation by cement dust. The scientific committee of the National Society of 

 Horticulture of France advised that dust from the cement plant killed the plants by covering 

 the leaves and checking respiration and transpiration. Legal action resulted in judgment 

 against the factory. — H. C. Thompson. 



DESCRIPTIVE PLANT PATHOLOGY 



1290. Brock, J. A. Diseases of sugar beets. Facts about Sugar 12: 470-471. 1921. — 

 This is a short description of the different diseases of sugar beets. — C. W. Edgerton. 



