13G 



tioii and drouth injury of corn and truck crops. The heav.v rainfall of July 

 31st. and August 1st. was state- wide and relieved the drouth situation to 

 a large extent although certain localities continued to suffer. 



There was hail injury to truck crops and strawberries at Madi.son. June 

 iL'th. and to truck crops, corn and (lats at Berne and Winona Lake. July 

 l!)th. 



August was not especially hot and local rains were frecpient. The rainfall 

 was. however, below normal and was insutticient. especially in certain local- 

 ities, to offset the drinith injury of July. The tirst half of September was 

 also hot and dry. thus further injuring potatoes and truck crops. Heavy 

 rains, September ISth. to 22nd.. followed by an excei>tionally warm, wet, 

 and late fall, with no frost until late in October, resulted in a very favorable 

 late growing season. 



To summarize briefly, we have had this year an early period of warm 

 weather in April followed by a destructive freeze, a cold wet May. an ex- 

 ceptionally hot and dry June and July period, followed by a generally favor- 

 able growdng season lasting until late in October. Certain types of parasitic 

 plant diseases are markedly influenced by such weather conditions. For 

 example, the cold wet weather of May was especially favorable to certain 

 fruit diseases such as apple scab, the subseiiuent hot dry weather to the 

 P^'usarium root diseases such as cabbage yellows, and the late growing sea- 

 son resulted in a prolonged exposure of crops to certain tyi)es of disease such 

 as the Septoria leaf-spot of tomato which increase in prevalence and se- 

 verity as the season advances. 



diseases aruangeu by hosts. 



Alfalfa. 



Leaf-.spot caused by /'.sTH(/o/>cc/cy/ nicdhitfihiix was generally prevalent. 



AlM'LE. 



Blotch caused by /'In/Hosticfd solitarin was the most serious disease in 

 the southern part of the state on the susceptible varieties. Northwestern 

 and Rhode Island Greenings, Stark, Ben Davis, Smith Cider, Ducliess, and 

 Arkansas Red, according to C. L. Burkholder who further reports that 

 blotch was much worse than usual this year. According to J. Oskamp, C. L. 

 Burkholder, and F. P. Cullinan. the northern limit of blotch as an important 

 commercial factor in Indiana could be represented by a line across the state 

 north of Indianapolis through the counties of Fountain, Montgomery. Boone, 

 Hamilton, and Madison. The disease occurs, however, on the Stark and 

 Northwestern Greening to a considerable degree as far north as the Wabash 

 valley. The above observers also report that, in the badly infested southern 

 half of the state, the disease seemed to be most severe in the southwestern 

 corner and along the Ohio River. Oskamp reports severe blotch at Solon, 

 Indiana. Blotch was found in neglected orchards about Lafayette and in 

 sprayed orchards at Bedford. Mooresville, Greenfield, and Knightstown. 



At Greenfield cankers on 1918 wood were not at all common. Counts 



