NOTES ON PLANT DISEASES OF CONNECTICUT. 715 



of apples, so common this year, was traceable in part to these 

 frosts. 



Again the summer proved to be one of drought, thus making 

 four years in succession that may be so classed. However, like 

 the preceding one, it was temporarily broken in midsummer by 

 rains that saved most of the crops from serious injury, though 

 potatoes, especially early varieties, were a very light crop. The 

 fall months were unusually dry, and this late drought was not 

 broken until late in December, so that a water famine threatened 

 many communities. As in the preceding year, the first fall 

 frost was delayed until the middle of October, thus favoring 

 the late crops. 



Diseases Prevalent in 1910. Among the most conspicuous 

 diseases of the year may be mentioned the following. Apple: 

 Rust, Scab, Frost and Spray Injury. Cherry and Plum: Black 

 Knot. Chestnut: Bark Disease, Drought Injury. Corn: Smut. 

 Hollyhock: Rust. Maple: Leaf Scorch. Muskmelon: Mildew 

 Blight. Peach: Leaf Curl, Brown Rot (chiefly spring infection 

 of twigs, etc.). Pear: Scab. Pines: Pine-Sweetfern Rust. 

 Potatoes: Rot (Blight), Tip Burn. Rye and Barley: Powdery 

 Mildew. Quince: Rust. Sycamore: Anthracnose. 



Concerning the spray and frost injury of apples, there 

 appears a discussion in Part VII of this Report. There was 

 more peach leaf curl than we have seen before in this state, 

 and while the wet spring favored twig infection with brown 

 rot, this did little harm to the mature fruit except during a wet 

 week in September, when some injury was done to certain 

 varieties in the vicinity of Wallingford. Potatoes suffered 

 most from tip burn, but the rains came so that blight developed 

 slightly on the late varieties and caused some rot of the tubers 

 for the first time in several years. Blight, in late August and 

 early September, carried off many of the melon fields that had 

 not been sprayed. 



The effect of successive droughts of the past four years has 

 begun to be manifest on our shade and forest trees, so that an 

 unusually large number of them are dying. This is especially true 

 of the chestnuts, where the blight fungus plays a very important 

 part on these weakened trees. 



On the whole, 1909 and 1910, because of their dry summers, 

 were not years in which fungi became especially troublesome, 



