NOTES ON PLANT DISEASES OF CONNECTICUT. 729 



swellings, usually globular in shape, and in early spring the 

 fruiting stage shows under the denuding bark as orange-colored, 

 dusty spore masses, with the peridia rarely forming distinct cups, 

 as in the next species. The II and III stages occur on species 

 of oak. So far as could be seen, these did not appear on 

 the oaks in the vicinity, and as all the infected pines were 

 destroyed, it is not likely to become established there. Infec- 

 tion experiments made in the laboratory from the I stage, 

 however, produced the III stage only very readily on seedlings 

 of both red and white oaks. So far this fungus has not done 

 much damage elsewhere on either host. See Plate XXXVI b. 



PINE-SWEETFERN RUST, Cronartium Comptonice Arth. (I. 

 Peridermium pyriforme Pk.) In the Report of 1907, page 380, 

 the writer reported the I stage of this rust on both Pinus rigida 

 and P. sylvestris from this state. It had become established 

 on the latter host in the station forest plantation at Rainbow. 

 In 1910 it was found there also on Pinus rigida, P. austriaca, 

 and P. maritima. It was also found in its II and III stages 

 on the sweetfern, to which it had spread since its introduction. 

 Apparently most of these pines had become infected in their 

 nursery beds at Poquonock before transplanting here some 

 years ago, as thousands of seedlings of Pinus rigida grown from 

 the first in their vicinity showed practically no infection. The 

 specimens of P. maritima, however, had become infected there 

 in their seed bed, yet we could find no infected sweetfern in 

 their immediate vicinity this year. In order to prevent further 

 spread of the rust, all infected pines were destroyed or the 

 infected branches cut off, and the forester had all the sweetfern 

 in the vicinity mowed off. Most of the pines, having the fungus 

 on their main trunk, were of little value. Where infection 

 takes place after the pines are a few years old, the damage is 

 not likely to be nearly so severe as when it takes place in the 

 seed bed. See Plate XXXVI c. 



PINE, WHITE, Pinus Strobus. 



Drought Injury. In the fall of 1909, Mr. Spring noticed a 

 few spots in one of the seed beds at the station forest plantation 

 where the white pine had been entirely killed out for the space 

 of a few inches. Specimens of these and some of the adjacent 

 living pines were brought to the writer at the time for examina- 



