New York Agkicultueal Experiment Station. 359 



Plate XXX. Fig. 1. — Apple tree harJc inoculated with cul- 

 tures of Sph[eropsis from cankered apple 

 limhs. Inoculations were made in the outer 

 hark; the fungus was unable to reach cam- 

 bium but made small wounds in the outer 

 baric. Where the bark has been removed the 

 scars resemble those shown in Fig. 2. 



Fig. 2.^Sectiou of limb shown in Plate XXIX, 

 Fig. 1, enlarged to show scars more in detail. 



Fig. 3. — Limb of a large apple-tree inoculated ' 

 in spring of 1898 ivith culture of Sphseropsis 

 from, cankered apple tree limb. Photographed 

 fall of 1899. The canker enlarged materially 

 during the present season. Pycnidia of 

 Sphreropsis are abundant on dead bark and 

 decorticated wood. 

 Plate XXXI. — Inoculation experiments luith nursery stock. 



Fig. 1. — Apple tree inoculated with cultures of 

 Sphieropsis from cankered apple-tree limbs, 

 showing ivhat tvas designated " a very good " 

 growth of the fungus. 



Fig. 2. — Pear tree inoculated with cultures of 

 Sphseropsis fro7n cankered apple tree limbs, 

 shoiving very good growth of the fungus. 



Fig. 3. — Japanese plum tree inoculated with 

 cultures of Sphseropsis from decorticated wood 

 of Jiop hornbean. Very good growth of the 

 fungus. 



Fig. 4. — Apple tree inoculated with cultures of 

 Sphseropsis from pear twigs, showing slight 

 growth of the fungus. 



Fig. 5. — Check apple tree; punctured but not 

 inoculated. 



