PART X. 



REPORT OF THE BOTANIST FOR 1909 AND 1910. 



G. P. CLINTON, Sc.D. 



I. NOTES ON PLANT DISEASES OF CONNECTICUT. 



A. DISEASES IN RELATION TO WEATHER IN 1909 AND IQIO. 



Weather Conditions in ipop. The winter of 1908-09 was 

 not especially severe, so that trees did not show any unusual 

 injury, except from a couple of ice storms in February, 1909. 

 These storms so heavily coated the limbs that considerable 

 damage resulted, especially to shade and forest 'trees in the 

 northern half of the state, where the storm was more severe. 

 The spring of 1909 was rather wet and backward, so that such 

 fungous troubles as peach leaf curl, apple scab, etc., that gain 

 their foothold at this time of the year, were unusually prominent. 



The summer, however, especially in July and August, like 

 the two preceding seasons, was one of drought, but it was 

 broken in August by rains that prevented serious damage to 

 most of the crops. The late fall proved to be very dry. The 

 first killing frost did not occur until October 13. 



Diseases Prevalent in ipop. The following troubles were 

 conspicuous or unusually injurious during this season. Apple: 

 Black Rot (Leaf Spot form), Rust, Scab, and Spray Injury 

 (Bordeaux). Ash: Rust. Chestnut: Bark Disease. Egg 

 Plant: Wilt (Fusarium?). Elm: Leaf Spot. Muskmelon: 

 Leaf Mold, Anthracnose. Peach: Brown Rot (spring form on 

 twigs, etc.), Leaf Curl. Plum: Black Knot. Potatoes: Tip 

 Burn, Scab. Quince* Leaf Blight. Rose: Rust. Spinach: 

 Leaf Mold. Strawberries: Powdery Mildew, Winter Injury 

 (root killing). Tobacco: Calico. 



Of the above diseases the leaf spot of elm, which was quite 

 serious in some places, is discussed later in this Report (p. 7 1 ?)- 

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