92 ILLINOIS STATE ACADEMY OF SCIENCE 



in southern Illinois. Cauliflower also suffered severely 

 from Black Kot. 



On Tomatoes, Blossom-end Rot appeared locally and 

 Early Blight was of general occurrence. Wilt was more 

 serious than usual and Leaf Spot was as usual injurious 

 to plants everywhere. Mosaic was seen only in Douglas 

 and Effingham counties. 



Potato Black Leg was seen in three scattered counties, 

 Logan, Lawrence, and Monroe; and Curly Dwarf was 

 found in several fields in Carroll county. Early Blight 

 was especially prevalent in central Illinois while Scab 

 appeared most serious southward. 



DISEASE LOSSES 



While the reduction in yield from the attack of plant 

 diseases can not be accurately determined, it has been 

 the custom for several years to estimate the losses in 

 order to express in a concrete manner the importance of 

 these diseases. The estimates shown in the following 

 table indicate the importance ascribed to the diseases of 

 some of our important crops. 



ESTIMATED REDUCTION IN YIELDS* OP. ILLINOIS CROPS IN 

 1923, DUE TO THE PRESENCE OP PLANT DISEASES 



S~ - g 3 



P CO <M 5 "1 & « 



•S^ °° g » ^ B 



2* «3 s» S 1 



*3 %2 O-g £ f> 



e-3 ?% S? I *S 



p~ fee ?>* 



d 



^ O d, PJ !> H 



Cereals 



Wheat 62,506,000 16.5 12,351,000 $0.94 $11,609,000 



Oats 135,100,000 8.5 12,500,000 0.39 4,875,000 



Barley 6,612,000 5.5 384,000 0.58 222,000 



Rye 3,450,000 3.5 125,000 0.75 93,000 



Corn 337,312,000 20.5 87,102,000 0.65 56,616,000 



Fruits 



Apple 7,370,000 15.0 1,300.000 1.15 1,495,000 



Pear 307,000 7.0 23,000 0.94 21,000 



Peach 675,000 8.0 58,000 2.64 153,000 



Vegetables 



Potato 9,568,000 2.0 195,000 0.88 171,000 



Sweet Potato... 880,000 0.5 4,000 1.10 4,000 



Totals 



Cereals 544,980,000 17.10 112,462,000 $73,415,000 



Fruits 8,352,000 14.18 1,381,000 1,669,000 



Vegetables 10,448,000 1.86 199,000 175,000 



Total 563,780,000 16.82 114,042,000 $75,259,000 



* B of this kind have been made since 1917 in Illinois and else- 

 where and have come to represent the' crop reductions which trained and ex- 

 perienced workers believe to occur. Experiments, however, have indicated 

 that in several instances the actual reductions greatly exceed the estimates. 



