No. 2, September, 1921] PATHOLOGY 141 



tive period. A case of "pseudomonocarpy" is cited in Pinus attenuata, where the mature 

 cones do not drop off but are embedded in the trunk and often do not shed their seeds till 

 the tree dies. The author also calls attention to the xerophyllous characters of the cycadeoids, 

 as shown particularly by the dense masses of scaly ramentum with which the stems and leaves 

 are covered. lie believes that the early Cretaceous climate, under which they throve, was 

 a rather dry and cool one. — E. W . Sinnolt. 



893. Yabe, H., and S. Endo. Discovery of stems of a Calamites from the Paleozoic of 

 Japan. Sci. Kept. Tohoku Imp. Univ. (Geology) 5^: 93-95. PI. 15, fig. 7-8. 1921.— A detailed 

 description and illustration of a calamite of the Arthropitys type from the marine Chichibu 

 formation (upper Paleozoic) of Japan is presented. — E. W. Berry. 



PATHOLOGY 



G. H. Coons, Editor 

 C. W. Bennett, Assistant Editor 



(See also in this issue Entries 612, 639, 644, 653, 735, 791, 794, 832, 881, 887) 



PLANT DISEASE SURVEY (REPORTS OF DISEASE OCCURRENCE AND SEVERITY) 



894. Anonymous. Mosaic disease of canes. Jour. Jamaica Agric. Soc. 24: 313-314. 

 1920. — A report of the occurrence of the mosaic (mottling) disease of sugar cane in Jamaica 

 is given. Governmental regulations providing for the eradication of the disease are also given. 

 — John A. Stevenson. 



895. Anonymous. Plaga blanca de las cebollas. [White disease of onions.] Rev. Agric, 

 [Mexico] 5: 601-602. 1 fig. 1920. — A disease of onions due to Fusarium sp. has caused losses 

 to growers near Ciudad Victoria, Tamaulipas, Mexico. — John A. Stevenson. 



896. Byars, L. p. Notes on the citrus-root nematode, Tylenchulus semipenetrans Cobb. 

 Phytopathology 11: 90-94. Fig. 1. 1921. — Examination of trees in all the principal Citrus 

 growing sections of Florida indicates that the nematode disease of Citrus trees occurs in only 

 3 isolated localities, namely, Glen St. Mary, Gainesville, and Brooksville. Tests of the hot 

 water treatment for infested seedlings indicate that it may be developed into a feasible method 

 of control. — B. B. Higgins. 



897. Garrett, A. O. Septoria Negundinis Ellis & Ev. in Zion National Park. Phyto- 

 pathology 11: 100. 1921. 



898. Heald, F. D. Some new hosts for the Rhizoctonia disease. [Abstract.] Phyto- 

 pathology 11: 105. 1921. — Rhizoctonia has been found attacking strawberries {Fragaria 

 sp.) and wild onions {Allium sp.). — B. B. Higgins. 



899. Heald, F. D. The skin spot (Oospora pustulans) of the Irish potato. [Abstract.] 

 Phytopathology 11 : 104-105. 1921. — In a car load of potatoes shipped from British Columbia 

 95 per cent showed lesions of this disease. — B. B. Higgins. 



900. Jennison, Harry Milliken. Observations upon the bacterial blight of field and 

 garden peas in Montana. [Abstract.] Phytopathology 11 : 104. 1921. — A very serious disease 

 of field and garden peas (Pisum sativum L.) is produced by Pseudomonas pisi Sack. Dis- 

 semination is thought to be due largely to contaminated seed. — B. B. Higgins. 



901. Madariaga, a. Plagas y enfermedades del maiz. [Diseases and pests of com.) 

 Rev. Agric. [Mexico] 4: 449-455. 1919. — The rust {Puccinia) and smut {Ustilago maydis) 

 of Indian corn are discussed. — John A. Stevenson. 



