336 Report of the IIorticulturist of the 



those made in the larger tree were unprotected. The dark spored 

 fungus gTew at all points of inoculation, while all of the other 

 wounds soon healed. 



On July 11 an effort was made to imitate the scars that are 

 found in the outer bark that are mentioned on page 339. Small 

 pieces of the outer bark were cut from two small areas on sepa- 

 rate- limbs of a large tree which were inoculated with the dark 

 spored fungiis, making twenty-eight inoculations in all. Two 

 similar areas were inoculated with SchizophyUum commune and 

 two areas were prepared but not inoculated to serve as checks. 



Ten inoculations with the dark spored fungus, two with Schizo- 

 phyUum commune and two check wounds were made by cutting 

 through to the wood as before. All inoculations and check wounds 

 were kept moist with damp filter paper. The dark spored fungus 

 grew at all points of inoculation producing deep wounds or cankers 

 where the incisions were made through to the wood as is shown 

 in Plate XXX, fig. 3. Fig. 1 of the same plate shows the effect 

 of the inoculations where small pieces of the outer bark were 

 removed. The fungus was unable to penetrate to the cambium 

 and made only small surface wounds, as may be seen in the illus- 

 tration. The pieces of bark have been removed on one side leav- 

 ing scars which resemble those that occur on cankered limbs as 

 in Plate XXX, fig. 2. 



On the same date, July 11, four inoculations were made with 

 each of the two cultures in the larger limbs of a pear tree and 

 four of each in the larger limbs of a quince tree. The inocula- 

 tions, together with check wounds, were kept moist with dam]) 

 filter paper a? before. The dark spored fungus grew at all point? 

 of inoculation on the pear tree, but did not grow on the quince. 

 All of the inoculations with SchizophyUum commune together with 

 check wounds soon healed. 



These experiments showed conclusively that the dark spored fun- 

 gus can penetrate living apple-tree bark under certain conditions 

 and produce a cankered condition of apple-tree limbs and also 

 indicated that it may produce a diseased condition of pear-tree bark. 



