74 PATHOLOGY [Box. Absts., Vol. VIII, 



498. Gravatt, G. F. The chestnut blight in the southern Appalachians. Amer. Fores- 

 try 26 : 606-607. 1920. — It is predicted that the chestnut growth of the southern Appalachians 

 will be killed off just as the growth from New York south to southern Virginia is being killed. 

 — Chas. H. Otis. 



499. Johnson, A. G., J. G. Dickson, and Helen Johann. An epidemic of Fusarium 

 blight (scab) of wheat and other cereals. [Abstract.] Phytopath. 10: 51. 1920. 



500. Lyman, G. R. The 1919 survey for potato wart. [Abstract.] Phytopath. 10: 60-61. 

 1920 



501. Stevens, F. L. Foot-rot of wheat and its fungous associates. [Abstract.] Phyto- 

 path. 10:52. 1920. 



THE HOST (RESISTANCE, SUSCEPTIBILITY, MORBID ANATOMY AND 



PHYSIOLOGY) 



502. Anonymous. Bladrullesyge hos Tomater. [Leaf-roll of tomatoes.] Gartner-Tidende 

 [K0benhavn] 36: 123. 1920. — The rolling of the leaves often seen in tomatoes cannot be com- 

 pared to the leaf-roll of potatoes, but is a reaction following heavy pruning. Individual plants 

 or certain forms may be more inclined to roll than others. — Ernst Gram. 



503. Francos, G. A vine plant immune to Oidium. Cyprus Agric. Jour. IS : 146. 1920. 

 — A vine plant on the Heloan Farm at Alethrico was observed in August, 1919, to be quite 

 free from mildew ( Uncinula necator) while all the others were badly affected. Inquiry 

 regarding the source of this vine revealed the fact that it had been obtained from Ayios 

 Ambrosios and was known as "Laorcas." It is proposed to test thoroughly the persistency 

 of immunity of the vine to Oidium. — W. Stuart. 



504. Fromme, F. D. The development of loose smut of wheat as modified by soil fertility. 

 [Abstract.] Phytopath. 10: 53. 1920. 



505. HoDSON, E. R. Is American chestnut developing immunity to the blight? Jour. 

 Forestry 18: 693-700. 1920. — The chestnut blight does not appear controllable by ordinary 

 methods but observations appear to show that immunity is developing or that individuals 

 are resistant. As the chestnut sprouts at the base, the organism may live for two or three 

 decades and in this period immunity, which is the only hope for forest stands, may actually 

 develop. Two types of canker are recognized, atrophy, a depressed surface, and hyper- 

 trophy, a swollen distorted condition. In the first the plant makes no resistance to the dis- 

 ease, while in the second there is resistance to the invader. Immunity development requires 

 time, of which the apparent recovery of living tissue after a long period of attack appears to 

 be evidence. Long-time observations under forest conditions of actual developments are 

 necessary to determine whether the hypothesis is substantiated. — E. N. Munns. 



506. HoLBERT, J. R., James G. Dickson, and H. Howard Biggar. Correlation of 

 early growth variation and productivity of maize as influenced by certain pathologic factors. 

 [Abstract.] Phytopath. 10: 57-58. 1920. 



507. Johnson, A. G., and W. W. Mackie. Evidence of disease resistance in barley to 

 attacks of Rhynchosporiiun. [Abstract.] Phytopath. 10: 54. 1920. 



508. Jones, L. R., J. C. Walker, and W. B. Tisdale. Fifth progress report of Fusarium- 

 resistant cabbage. [Abstract.] Phytopath. 10: 64. 1920. 



509. McClintock, J. A. Field tests with strains of wilt-resistant tomato seed in 1919. 

 [Abstract.] Phytopath. 10: 59. 1920. 



