346 EXPERIMENT STATION RECORD. 



The varieties of citrus trees in the order of their susceptibility to this disease 

 are as follows: Grapefruit, Citrus tnfoliaia, Persian lime, Key lime, navel 

 orange, sweet orange, Satsuma, tangerine, mandarin. King orange, and lemon. 

 Thus far the caulker has not been observed on any noncitrus plant. 



The rot of citrus fruit, G. L. Fawcett {Porto Rico Prog., 8 (191J^), No. 1, 

 pp. 5-7). — An account is given of an investigation of a rot of citrus fruits 

 which seriously affects oranges in shipment. The trouble is considered due to 

 Diplodia natalensis, and the principal sooirce of infection is believed to be in 

 the grove. To reduce this infection the author recommends the pruning out 

 and destruction of dead or unhealthy branches and spraying the trees with 

 fungicides. 



Fungi parasitic on the tea plant in northeast India, II, A. C. Tunstall 

 (Indian Tea Assoc, Sd. Dept. Quart. Jour., No. 1 {lOlJf), pp. 36-39). — In con- 

 tinuance of previous work (E. S. R., 31, p. 55), the author describes Rosellinia 

 root disease of tea bushes. This is said to be easily controlled by removal of 

 all dead wood and jungle, exposure of the collars of the surrounding tea bushes, 

 imprm'ement of drainage, if necessai'y, and treatment of the upi)er 6 in. of the 

 affected soil with A lb. quicklime per square yard. 



Two new Chytridiaceae, P. Hakiot (Compt. Rend. Acad. Sci. [Paris], 158 

 (1914), No. 23, pp. 1705-1707). — Descriptions are given of Cladochytrium mauryi 

 n. sp., parasitic on leaves of Colchicum autmnnale, and Cladochytrium oUivieri 

 n. sp., which was found on leaves of Orchis incarnata and 0. laxifiora. 



Peridermium cedri as a destructive fung'us, R. S. Tboup (Indian Forester, 

 40 (1914), No. 10, pp. 469-472, pi. 1).—In a previous' publication (E. S. R., 27, 

 p. 654) the author called attention to the occurence of witches' brooms on 

 Deodar due to the fungus P. cedri. Recent observations have shown that the 

 disease is not only more widely spread than has been hitherto supposed, but 

 also that it is one of serious importance. In some plantations at least 80 per 

 cent of the trees were found to be visibly affected. 



A contribution to the morphology and life history of Pestalozzia funerea, 

 J. J. Wenner (Phytopathology, 4 (1914), No. 5, pp. 375-384, pi. 1, figs. 7).— 

 Experiments have been conducted to determine the exact relation of P. funerea 

 to various coniferous hosts, inoculation experiments having been made on 

 white pine, Norway spruce, and hemlock. 



The experiments have proved that this species is parasitic under certain con- 

 ditions, the most important of which appears to be the presence of a great 

 amount of moisture in the air. The fungus was able to attack the leaves and 

 stems of all of the host plants used in the experiments, producing a browning 

 of the leaves, and followed in some cases by the appearance of superficial 

 mycelium and the drooping of the young shoots. The shoots finally die and 

 eventually the whole plant is killed. 



In addition to the characteristic conidia of the fungus another spore form 

 was found, which is said to correspond to a chlamydospore. 



For the control of this disease it is recommended that affected seedlings be 

 destroyed whenever detected, and as a preventive measure that ordinary spray- 

 ing be adopted. 



The expulsion of ascospores from the perithecia of the chestnut blight 

 fungus (Endothia parasitica), F. D. Heald and R. C. Walton (Amer. Jour. 

 Bot., 1 (1914), No. 10, pp. 499-521, figs. 2).— A report is given of a study of 

 various phases of ascospore expulsion under artificial conditions, the experi- 

 ments having been carried o^it through practically the entire year of 1913. 



Under artificial conditions in the laboratory spore expulsion was found to be 

 inhibited at low temperatures. The optimum temperature for expulsion was 



