56 EXPERIMENT STATION EECOED. 



au attempt has been made to deteruiine the cause of gum flow, \A-hich is quite 

 prevalent on peach trees in the college orchard. 



A study of the gummosis indicated that it somewhat resembles that de- 

 scribed by Massee (E. S. R., 12, p. 156), but instead of a Macrosporium fungus 

 accompanying the Cladosporium, the author found a species of Alternaria, 

 which seemed to be of common occurrence. The gum on the fruit-bearing 

 wood, appearance of the fungi, and histological changes accompanying gum- 

 mosis are described, and suggestions regarding its treatment are given. 



The suggestions for prevention include the removal of mummied fruits, prun- 

 ing out of infected tissues, and systematic spraying with lime-sulphur solutions, 

 directions for the preparation and application of which are given. 



Crown g'all, G. E. Stone (Massachusetts Sta. Rpt. 1910, pt. 2, pp. 58-61). »— 

 The author describes crown gall in raspberries, which is characterized by 

 large abnormal swellings near the crown of the roots. It is thought, however, 

 that the disease differs from that described by Smith and Townsend (E. S. R., 

 18, p. 950), as raspberries have been known to be affected for many years in 

 the State, while fruit trees have only been recently so reported. Moreover, 

 raspberries have been grown in close proximity to fruit trees in all stages of 

 development without the slightest evidence of gall infection. Considerable 

 difference of opinion is said to exist in regard to the effect of crown gall upon 

 a tree, and it is believed that it is less to be dreaded in New England than 

 in some other sections of the United States. 



Anthracnose of Schizanthus, C. N. Jensen and V. B. Stewart ( Phyto- 

 patholngy, 1 (1011), No. If, pp. 120-125, fig. 1). — Attention is called to a stem 

 disease of Schizanthus plants growing in the greenhouse of the plant breeding 

 department of Cornell University. This disease in the younger plants causes 

 a sudden falling over of the stem, branch, or petiole at the point of lesion. 

 In the older plants canker-like lesions appear on the stems or main branches, 

 usually at the base of the petioles. 



From a histological study of the lesions and from inoculation experiments 

 the causative organism was found to be a new species of fungus, Collctotrichuin 

 schizanthi, a technical description of which is appended. 



The chestnut disease (Diaporthe parasitica), G. E. Stone (Massachusetts 

 Sta. Rpt. 1910, pt. 2, pp. 56, 57). — ^A description is given of this disease, which 

 was first described by Murrill (E. S. R., 19, pp. 250, 251), and an account is 

 presented of its occurrence In Massachusetts. 



The disease seems to be most abundant in the Connecticut Valley, but it 

 is also reported from a few other widely separated stations. It has been 

 suggested that it is less prevalent on high elevations than in valleys. The 

 author reports a greater amount of winterkilling in the valleys than in the ele- 

 vated portions of the State, and states that there is a significant coincidence in 

 the appearance of the chestnut disease following the time when vegetation was 

 so severely injured by the cold of the winter of 1903-4. He is of the opinion 

 that the chestnut trees have not been in good condition during recent years, 

 and thinks that there is probably some relation between this and the occur- 

 rence of the fungus. A more thorough investigation of the cause and distri- 

 bution of the disease is to be made. 



A pecan leaf blotch, F. V. Kand (Phytopathology, 1 (1911), No. J,, pp. 133- 

 138, figs. 3). — Attention is called to a Mycosphterella leaf blotch of pecans 

 found in Alabama, Georgia, Florida, South Carolina, and Ohio, due, it is 

 claimed, to M. (SphfercUa) coiiverula. The cultural characteristics on arti- 

 ficial media and a technical description of this fungus are appended. 



