84 SUMMARY OF CURRENT RESEARCHES RELATING TO 



ing to the genera Pkyllostida and Microdiplodia. They caused spotting 

 on the leaves attacked. 



Bubak has been able to refer Oidium abelmoschi on Hibiscus esculentus 

 to Erysiphe dehor iacearum, having found the perithecial form. He found 

 Cicinnoholus abelmoschi sp. n. parasitic on the Oidium. 



Bubak also found a new species of Coniosporium on the maize corn 

 cobs ; it formed black patches of different intensity. The spores were 

 black, opaque, and lentiform. He named the new species G. gecevi. 



Haven Metcalf and J. Franklin Collins * give an account of the 

 ravages of chestnut-bark disease. It was first noted in New York City 

 in 1904, but is now present in ten States, and the total financial loss is 

 estimated at 25,000,000 dollars. The fungus causing the disease, 

 Diaporthe parasitica, spreads under the bark and so girdles the tree. 

 The spores are disseminated by birds, insects, squirrels, etc. The disease 

 is also spread by nursery stock, tan bark, unbarked timber, etc. Diseased 

 chestnut timber should be cut down and used as soon as possible. 



F. C. Stewart t publishes an account of plant diseases and mal- 

 formations that have been observed in New York during the last ten 

 years. The survey includes diseases of trees, herbs, fruit, etc., in forests, 

 gardens, and orchards. Several of the various diseases are illustrated by 

 photographs. 



P. SorauerJ describes cases of disease in the Orchids Ctelogyne 

 cristata and Catleya Mendelii. Both bulbs and leaves were injured and 

 died off. Pustules of the fungus Gloeosporium affine were found on the 

 discoloured portions of the leaf. Experiments were carried out with 

 the spores and with the manuring of the plants, of which a full account 

 is given. 



Fred A. Wolf § describes a disease of figs which occurred in Texas, 

 about half of the fruit being destroyed in one grove where the disease 

 had persisted for several years. The fungus was identified as morpho- 

 logically similar to Macrophoma Fid, recorded only from Alrica. It 

 attacks first the twigs and large branches and hibernates within the bark. 

 It gains entrance into the fig by way of the open end of the receptacle. 

 Wolf recommends the cutting away of the diseased wood. 



J. Weese || has studied canker of fruit-trees, and he comes to the 

 conclusion that Nectria ditissima is not the cause of the disease but 

 another species, N. galligena. The author adds various notes on other 

 species of the genus. 



T. Fetch If has gone into the question of the affinities and life-history 

 of Thielaviopsis paradoxa, a disease of sugar-cane, which was first dis- 

 covered on pineapples in France. Recently it has been found to be 

 the cause of a stem disease of coco-nut palm in Ceylon. 



Fetch gives an account of cultures, etc., undertaken by various 



* U.S. Dept. Agric, Farmer's BuU. No. 467, 24 pp. (4 figs.), 

 t New York Agric. Exp. Stat., Bull. No. 328(1910) 404 pp. (18 pis.). 

 X Zeitschr. Pflanzenkr., xxi. (1911) pp. 385-95. 

 § Ann. Mycol. 1911, pp. 622-4 (3 figs.). 



[| Zeitschr. Landw. Yersuchsw. Oesterreich, 1911, pp. 872-85 (1 pi.). See also 

 Ann. Mycol. ix. (1911) p. 633. 



\ Ann. Bot. Gard. Peradeniya, iv. 7 (1910) pp. 511-74. 



