14G 



Twig lesions of the scab disease caused by Cladosporium carpophilum 

 were found very common on tlie 1918 wood and were noted in four counties. 

 In the Knox County crop, fruit infection was ratlier abundant but occurred 

 too late to be of economic importance except as a minor blemish. 



A root rot caused by Armillaria mellea was found in Brown County. 



The severe winter injury of 1917-18 is conspicuous in the peach orchards 

 near Paoli, which were rendered practically worthless. Frost injury to 

 the blossoms reduced the Indiana crop severely this season. 



Pear. 



Fire blight caused by Bacillus aDij/lovonis was very severe early in the 

 summer, especially in the southern half of the state. I'ipal reports that fire 

 blight is ruining orchards in Tippecanoe and (libson couiil'u's. Some of 

 these have yielded no fruit for several years. 



Leaf-spot caused by Scptoria pinicDhi is common on dooryard trees. 



Scab caused by Ycntiiria pyrliui (•ccurrcd locally. 



PErPER. 



Sunscald of the green fruits was undoubtedly (lie cause of lli(> greatest 

 losses in this crop. The scalded areas are readily invaded by rol-prodiiciiig 

 fungi. 



Mosaic was rather common late in the season. 



Plum, 



Brown rot caused by Sclcrotinia chierca was severe on fariii yard I ices 

 in general. Twig blight due to the same fungus was noted also. 



The leaf-spot caused by Bacterium pruni was noted in Black Idrd, I'loyd, 

 and Marshall counties. It was found quite serious near Plymoulli. .Iiiiie ."Ird. 



Black knot due to Ploicrightia morhosa was found in White ('(luiily and 

 Pipal reports a case in an orchard in Hendricks County in which every tree 

 is being killed by black knot. 



Twig injury caused by Exoascus j)runi was very severe in an orchard 

 in Hancock County early in the season. 



Frost injury to the blossoms reduced the yield. Ilusset and cracking of 

 the fruit due to frost injury was noted at Plymouth, June 3rd. 



Potato. 



The hot dry summer season was very unfavorable to the potato crop. The 

 vines as a rule remained vmdersized, the leaves were small with a ten- 

 dency to roll upwards, and the yield was low. 



The weather conditions which prevailed this season were especially con- 

 ducive to the non-parasitic disease known as tip-burn, which was ])revalent 

 throughout both the early and late crops. Undoubtedly soil and seed stock 

 have some influence on the severity of this disease. The relative importance 

 of the leaf-hopper as a causal agent in connection with tip-burn is still in 

 question. C. T. Gregory and F. C. Gaylord found that a combined spray of 



