NOTES ON PLANT DISEASES OF CONNECTICUT. 719 



This fungus was placed by Ellis under the genus Dothidella 

 as D. Ulmea (Schw.) E. & E. It is, however, quite distinct 

 in its microscopic appearance, as Ellis states, from Dothidella 

 Ulmi (Duv.) Wint, although the two have ascospores very 

 similar. The latter fungus has its perithecia embedded in a 

 distinct black stroma, and the necks open on the upper surface 

 of the leaves. The former, by the crowding of the perithecia 

 together, has something of the appearance of an imperfect 

 stroma, while the perithecia open on the under surface of the 

 leaves mature their asci later, and apparently have no other 

 stage connected with them. 



HEMLOCK, Tsuga canadensis. 



HEMLOCK-HEATH RUST, Pucciniastrum Myrtilli (Schum.) 

 Arth. (I. Peridermium Peckii Thuem.) The T stage of this 

 fungus (see Report 1907, pp. 350, 383), which is not uncommon, 

 though rarely abundant, in this state on hemlock, has now been 

 connected by us, through artificial infections, with the II and 

 III stage of the above Pucciniastrum, which we found in 1910 

 for the first time on various species of blueberry and huckleberry. 

 Pucciniastrum minimum on cultivated azaleas, also found here 

 (see Reports 1907, p. 392 and 1908, p. 854), is probably not 

 distinct from this Pucciniastrum. 



PEACH, Prunus Persica. 



Spray Injury. Sturgis (Report 1900, p. 219) has recorded 

 spray injury to the foliage of peach by Bordeaux and other 

 fungicides used in his experiments to prevent peach rot and 

 scab. He found potassium sulphide to be about the least 

 injurious fungicide when used at the rate of I Ib. to 50 gallons 

 of water. In our experiments with spraying peaches in 1910, 

 this strength was used, and very little injury, except shot-holes 

 in a few of the leaves, resulted/ However, when arsenate of 

 lead (rate of 3 Ibs. to 50 gallons potassium sulphide) or Paris 

 green (i Ib. to 100) was added, the most serious injury resulted. 

 Not only were the leaves badly injured by shot-holes, but in 

 time they all fell off. Many of the young twigs were also badly 

 spotted (purplish spots much like those produced by the scab 

 fungus), and some were killed. A few young trees were so 

 severely injured that they finally died. 



