256 PATHOLOGY [BoT. Absts., Vol. IX, 



1562. Taubenhaus, J. J., and Fredereck W. Malley. Pink root disease of onions and 

 its control in Texas. Texas Agric. Exp. Sta. Bull. 273. 4^ p., 3 fig. 1921. — The disease is 

 widespread, being found in California, Iowa, Wisconsin, New York, and Bermuda Islands, 

 as well as in Texas. It is suggested that the disease was probably introduced from Bermuda 

 in shipments of dry sets. The cause of the disease is shown to be Fiisarium malli. All varie- 

 ties of onions tested except the Extra Early Red showed a high degree of susceptibility. Nar- 

 cissus, tulip, freesia, lilies, etc., are not subject to pink root. — It seems probable that other 

 associated organisms increase the virulence of the pathogene. Methods of control, such as 

 crop rotation, fertilizers, and soil sterilization, are discussed. — L. Pace. 



1563. Vermoesex, M. Note sur la maladie du "coup de soleil" des cacaoyers du Mayumbe. 

 [Note on the "sun stroke" disease of cacao trees in Mayumbe.] Bull. Agric. Congo Beige 

 11 : 2-21. Fig. 1-^1. 1920. — The "sun stroke" disease attacks principally the trunks of cacao 

 trees. A parasitic fungus, Diplodia theobromae, develops on the affected trunk, blocks the 

 conducting vessels, and leads rapidly to the death of the tree. The Diplodia attacking cacao 

 trees in Mayumbe, W. Africa, is the same species to which is attributed "dieback" of cacao 

 trees, Hevea spp., and also the "brown rot" of cacao beans in various tropical countries. 

 The Diplodia probably attacks trees of low vitality; it enters the trunk through wounds and 

 acts so rapidly that trees which have formed fruits at the beginning of January are dead to- 

 ward the end of February. Distribution is affected by wind, birds, insects, and rain. In 

 dealing with this disease 2 factors must be considered ; the primary or determining cause, which 

 is still unknown, and the secondary cause, which is the Diplodia. Various theories have been 

 advanced as to primary cause; planters attribute it to sun-scald, but this theory is not tenable. 

 Certain other possibilities are discussed, particularly injury caused by borers and other in- 

 sects, the damage done by termites, and the possible presence of another fungus hitherto 

 undetected. Precautions recommended comprise general sanitary measures, the choice of 

 suitable varieties, and attention to soil drainage. — E. M. Doidge. 



1564. ViNCENS, F. Parasitisme du Schizophyllum commune Fries sur la canne k sucre. 

 [Parasitism of Schizophyllum commune on sugar cane.] Bull. Agric. Inst. Sci. Saigon 3: 65- 

 68. PI. 2. 1921. — The author verifies the findings of others that this fungus, although nor- 

 mally a saprophyte, occurs as a parasite on sugar cane. — E. D. Merrill. 



1565. Weir, James R. Thelephora terrestr's, T. fimbriata, and T. caryophyllea on forest 

 tree seedlings. Phytopathology 11: 141-144. PI. 5. 1921. — Thelephora terrestris has been 

 found enveloping forest tree seedlings in nursery plantings and in the forests of various 

 localities. The fungus closely envelops and smothers the young plants ; but the mycelium does 

 not penetrate the living tissue. — T. fimbriata and T. caryophyllea were also found enveloping 

 seedlings of various conifers in nurseries and in the forests. Neither of the latter species has 

 previously been reported on coniferous seedlings. — B. B. Higgins. 



1566. Wolf, Frederick A. Report of the Division of Plant Pathology and Bacteriology. 

 Ann. Rept. North Carolina Agric. Exp. Sta. 43: 53-55. 1920 [1921].— The author presents 

 a concise statement of investigations with tobacco wildfire, soybean leafspot, velvet bean 

 leafspot, false anthracnose of vetch, crop injury by borax, flagellation of legume-nodule 

 bacteria, and tests with varieties of wheat resistant to leaf rust. — F. A. Wolf. 



ERADICATION AND CONTROL MEASURES 



1567. Darnell-Smith, G. P. [Rev. of: Hurd, Annie May. Injury to seed wheat re- 

 sulting from drying after disinfection with formaldehyde. Jour. Agric. Res. 20: 209-244. 

 6 pi. 1920 (see Bot. Absts. S, Entry 1375).] Agric. Gaz. New South Wales 32: 323-325. 1921. 



1568. Farley, Arthur J. Results of summer spraying and dusting peaches. Proc. 

 Amer. Pomol. Soc. 35: 175-181. 1917 [1919]. — A comparative test on peaches of the value of 

 self-boiled lime-sulphur and hydrated lime-sulphur and glue is recorded. Both materials 



