PLANT DISEASES OF CONNECTICUT: 351 



or tongue-shaped, and run together on the stems, as shown in 

 the illustration. On the leaves they are smaller, more isolated, 

 more nearly conical, with one to three on a leaf. An examina- 

 tion of the sori showed that they contained two types of spores, 

 one type long, pointed, thin- walled, chiefly in the interior of 

 the sorus, and the other smaller, thicker-walled, with round 

 apices, less abundant, and chiefly on the exterior. Those on 

 the leaves are as a rule smaller than those on the stem. Shirai 

 found that insects, especially bees, were important factors in 

 carrying the sporidia of the germinating teleutospores in these 

 sori to the alternate rosaceous hosts. 



This rust is probably perennial in the stems of the juniper, 

 or else it takes two years for the sori to develop after infection. 

 A juniper, which was badly rusted at the time of their discovery, 

 was potted and placed in our greenhouse, where it has remained 

 for two years. After the disappearance of the sori in the 

 spring, the plant showed no signs of the rust that year or the 

 next, but the spring following it again broke out in a different 

 part of the stem, but not so conspicuously. Just how serious 

 this rust might prove in its I stage on our pomaceous fruits; if 

 it got started here, we do not know, but they certainly already 

 have enough similar troubles. 



KAFFIR CORN, Sorghum vulgare var. 



GRAIN SMUT, Sphacelotheca Sorghi (Lk.) Clint. We have 

 reported this smut before on sorghum and broom corn. In 

 September, 1911, we found it not only on these hosts, but also 

 on Red Kaffir corn grown at the Experiment Station farm for 

 experimental purposes. None of these hosts are of commercial 

 importance in this state, so the smut is not of economic import- 

 ance here, though often serious elsewhere. It changes the seeds 

 into kernels filled with a dusty mass of brownish-black spores. 



PEACH, Prunus Persica. 



STEM CANKER, Phoma Persica Sacc. This fungus has been 

 reported previously in this country by Selby of Ohio (Ohio Exp. 

 Stat. Bull. 92: 233. 1898. Ibid. 214: 423. 1910), who called 

 it Constriction Disease of Stem, or Stem Blight. He reported it 

 doing considerable injury in one lot of heeled-in nursery stock, 



