7l6 CONNECTICUT EXPERIMENT STATION REPORT, 



except those starting during the wet springs. In Parts B and C 

 of this paper we discuss certain diseases that are new to the 

 state, or concerning which special information was obtained. 



B. NEW OBSERVATIONS ON DISEASES PREVIOUSLY REPORTED. 



APPLE, Pyrus Mains. 



Spray Injury. Both during 1909 and 1910 there was con- 

 siderable injury resulting from spraying apples in this state 

 with Bordeaux mixture. As previously reported, this injury 

 was of the nature of leaf spotting and fruit russeting. Experi- 

 ments conducted in 1910 with different fungicides to replace 

 Bordeaux, because of this tendency to injure, showed that there 

 was danger of serious leaf spotting and subsequent fall with 

 "One for All" (rate 5 or 6 Ibs. to 50 gallons of water), and 

 also with "Sulfocide" (rate I to 200) when either Paris green 

 or arsenate of lead was used with it, though the injury with 

 Paris green when lime was added was lessened. Even without 

 these insecticides, this strength of "Sulfocide" sometimes pro- 

 duces more or less leaf spotting. Some leaf injury was also 

 caused by Bogart's "Sulphur Compound" used at the rate 

 of 1^2 to 50. Practically no russeting or leaf spotting was 

 produced by any of the straight commercial lime-sulphur 

 sprays, with arsenate of lead added, even at the rate of iJ/2 to 

 50, except what occasionally occurred in the shape of sun 

 scald on the most exposed side of the fruit. While this rarely 

 occurred, when it did it produced rather serious injury. On 

 the whole, the straight commercial lime-sulphur sprays were 

 the most satisfactory as regards least spray injury. For further 

 information, see Part VII of this Report. 



CHESTNUT, Castanea dentata. 



CHESTNUT BARK DISEASE, Diaporthe parasitica Murr. In 

 our Report for 1908, page 879, we gave an account of this 

 trouble. At that time it had been reported in every one of 

 the twenty-three towns of Fairfield County, and in eight towns 

 in New Haven County, making thirty-one towns altogether. 

 At the time of writing this article (March 20, 1911), its known 

 distribution is as follows: Fairfield County, twenty-three towns; 

 New Haven County, twenty-one towns; Litchfield County, 



