346 K.ErouT of the Horticultural Department of the 



different species, and to a lesser €xtenit the same will be true of 

 apple and pear trees. The second explanation is that Sphmropsis 

 is not parasitic on these trees. 



The statement was made in Bulletin 163 that the so-called 

 species of 8p]i(cropsis occurring on apple bark and on decorti- 

 cated apple wood are identical and that they are also identical 

 with the black rot fungus of apple, pear and quince fruits, 

 Sphccropsis malorum Pk. It can now be stated that as a result 

 of experiments extending through three seasons we hava posi- 

 tive evidence that this Sphwvopsis occurs on apple trees, pear 

 trees and hawthorn trees and on apple, pear and quince fruits 

 and will grow as well on one host as on another. There is then, 

 no reason for maintaining separate species for the fungus as 

 it occurs on these hosts. 



The results also indicate that there are still other hosts for 

 the fungus, but further experimentation will be necessary before 

 they will be definitely determined. 



SUN-SCALD, SUN-BURN AND CANKER. 



On page 188 of Bulletin 163 reference is made to the occur- 

 rence of sun-scald, or winter injury, and its connection with the 

 canker fungus. After becoming somewhat familiar with orch- 

 ards in a state where sun-scald is a menace to all kinds of fruit 

 trees, the writer is convinced that this condition is much more 

 common in New York orchards than is commonly supposed. 

 TIk longitudinal areas of reddish bark often seen on the south 

 ana southwest sides of trunk or limb are an indication of sun- 

 scald. The tissues of this discolored bark have been killed by 

 sun and frost. At the approach o^ warm weather, fermentation 

 may set in and a sour odor be given off from the affected parts. 

 A number of trees of the more tender varieties in the Experi- 

 ment Station orchards have been ruined by sun-scald and at the 

 present time the orchards contain several trees that are ser- 

 iously injured. Such injuries may be looked for in any part of 

 the State. 



