35 2 CONNECTICUT EXPERIMENT STATION REPORT, IQI2. 



and he also found occasional specimens in orchards. Selby has 

 not since found that this was a serious trouble in his state, and 

 apparently the pruning off of the diseased branches is the only 

 treatment necessary. From what we have seen of it in Con- 

 necticut we do not consider it a disease likely to prove trouble- 

 some here. Apparently it develops best on trees in a weakened 

 condition. 



It was first found in Connecticut in October, 1911, by Dr. 

 Britton, while inspecting one-year-old seedlings in one of the 

 nurseries, and later the same nursery company sent the writer 

 specimens, writing as follows: "We are sending you under 

 separate cover some samples of peach twigs. These were sent us 

 by a customer of ours in New York State. We think he planted 

 these trees last spring, and he says that he has quite a few where 

 the wood is black in the center and the foliage is turning yellow 

 and the edges of the leaves have been looking bad since July 

 i5th." 



An examination of both sets of specimens showed the fruiting 

 stage of the Phoma fungus present. The twigs were partially 

 or completely encircled by a depressed band of dead bark of 

 varying width. This injury does not immediately kill the parts 

 above, as the wood there often forms a greater growth than 

 that below the cankers, giving rise to a slight swelling, though 

 eventually the parts above are killed. The leaves turn yellow, 

 and finally drop off. Cutting through the wood, we found a dark 

 streak next the cambium, below the canker, but above it this 

 was covered by the subsequent growth of the wood which formed 

 the swelling. The stems were brittle and easily broken off at 

 these areas. The fruiting pustules of the fungus show as small, 

 more or less abundant, black specks. . From these there ooze 

 out the hyaline, oblong to broadly oval spores, which are round 

 at the ends, sometimes slightly curved, and 7-10 \i long by 3-3.5 /". 

 wide. 



PINES, Finns sps. 



PINE- ? SOLIDAGO RUST, Peridermium delicatulum A. & K. 

 Plate XVIII a-b. Late in June, 1912, while examining the leaves 

 of Pinus rigida at Granby for Peridermium acicoluni, we not only 

 found specimens of that rust, but also ran across specimens of 

 another leaf rust on the same host, which was entirely dif- 



