142 



fcstcd with iicniiitodes that its iiso for truck crops has been discontinued. 

 This nematode infestation has heen present at least five years. 



Cherry. 



Leaf-spot caused by Coccomyces hiemaVis was the most serious cherry 

 disease .and was generally prevalent and widespread. It was responsible 

 for a marked yellowing of the foliage and consequent defoliation. Undoubt- 

 edly leaf-spot is a limiting factor in cherry production in Indiana. C. L. 

 Burkholder reports that a successful spray control was secured by R. A. 

 Simpson at Vineennes, using Bordeaux 2-4-50. 



Brown rot due to Selcrotinia ciiicrc'i was reported by one grower near 

 Indianapolis to be very severe on the (»\-heart variety. 



Powdery mildew due to Podospliavra oxi/canthac was found in Jackson 

 County. 



Clover. 



Anthracnose due to CoUefotrichitm trifoJii was very serious on red clover. 

 A badly diseased field was noted near Hartford City. 



Leaf-spot caused by Pseudopeziza irifolii was found in Hancock County. 



A spotting of sweet clover due to Ascochi/ta caulicola was found in Jef- 

 ferson County. 



Corn. 



The most serious disease of corn was the root rot due to Fusarium 

 species. G. N. Hoffer reports that this disease was state-wide in distribu- 

 tion but was worst in Shelby, Noble, and Bartholomew counties. It is 

 worse in the lighter soils and in clay spots in the fields. The disease 

 causes firing of the lower leaves and results in barrenness and nubbin pro- 

 duction. The loss in yield due to root rot is estimated at 5% to 10%. 

 The fungus is carried in the seed and also persists in the soil. 



Leaf sheath, nodal, ear and root infection with the fungus GihhrrvUd 

 saubinetii has been the cause of much loss this year according to Hoffer. 

 The most important injury is due to the shank infection which causes the 

 ears to lop over and to the root rot. This is the same fungus which causes 

 wheat scab.^ 



Holier also reports that corn ear rots due to Fusarium and Diplodia 

 were not prevalent this year because of the fact that the weather was 

 very favoiable for the ripening of the grain. October and November 

 fio(.(ls ill sontliern Indiana li;i\c ciiimmI much loss in seed corn, however, 

 'lue to nioiduiir of the ears both on the stalk and in the shock. 



Smut caused by Ustilago zeae was present in the usual abundance. It 

 was worse in sweet corn a'nd in fields where corn was grown in 1018. 



Rust caused by Puccinia sorghi was less abundant than usual and was 

 most common in the late plantings of sweet corn. 



Stewart's disease caused by Bacterium stewartii was found near Ladoga, 



iHoffer, G. N., Johnson, A. G., and Atanasoff, D. Corn root — rot and wheat scab 

 Jour. Agr. Research 1', :611-612. 1918. 



