“« 
142 TWENTY-FIFTH ANNIVERSARY REPORT. 
The Third Annual Report!’ of the Station contains articles on 
peach yellows, leaf curl and gumming. In the discussion of leaf 
curl it was pointed cut that the fungus is perennial within the 
tissues of the twigs, as suggested by the German plant pathologist, 
Frank. The article on gumming is a résumé of the knowledge 
of the subject at that time with the addition of some original ob- 
servations and experiments, none of which were of much import- 
ance. An instance is cited in which a violent attack of gumming 
resulted from hail injury. 
In the Sixth Annual Report*® the perennial habit of the leaf 
curl fungus is reaffirmed and record is made of an experiment in 
which the cutting out of all limbs showing signs of leaf curl pro- 
duced no sensible decrease in.the amount of the disease the fol- 
lowing year. | 
Bulletin 191 1° contains short notes on leaf curl, fruit rot, “ little 
peach” disease, yellows, brown spot of the fruit and canker of the 
twigs, trouble with peach trees in the nursery cellar, double peaches, 
hail injury, Cytospora canker and splitting of peach trunks. The 
most important of these notes is the one on brown spot.‘4 
In Bulletin zoo, an account is given of an interesting case of 
imperfect fertilization in peaches.42 It was observed “ that imper- 
fectly fertilized peaches may attain considerable size and remain 
hanging on the tree until September. In such cases this trouble 
may be mistaken for the “little peach” disease by persons un- 
familiar with the latter. However, in the “little peach” disease 
the pit is of normal size and provided with a well-developed kernel; 
while in cases of imperfect fertilization the pit is abnormally small 
and has no kernel, or at least only a partially developed one.” 
PEAR. 
Pear diseases have received their full share of attention. The 
investigations on pear blight published in the Third, Fourth and 
Fifth Annual Reports! of the Station are quite generally recog- 
nized by plant pathologists as important contributions to the knowl- 
Rot. 3:372-379 (1884). 
Frank, A. B. Krankheiten der Pflanzen, p. 526. Breslau. 1880. 
me Rpt eb2353eCioo24 
% Bul. 191:312-319 (1900) ; same in Rpt. 19:189-197. 
1 Helminthosporium carpophilum Lévy. 
12 Bul. 200:89-93 (1901); same in Rpt. 20:149-153. 
™3 Rpts. 3:357-367 (1884) ; 4:268-275 (1885) ; 5:259-273 (1886). 
