17 



interest, and may serve likewise as a partial check on conclusions 

 drawn from the discussion of the injury to corn. The grass injury 

 was, however, relatively so light that only the five lesser grades 

 can be used, even for Southern Illinois. 



Table Y. 



Southern Illinois, 191 Towns. Injury to Grass, 1887, compared 

 with Crop Areas for the Same Year. 



Degree of Injury. 



No. of 

 Tps. 



Wheat. 



Barley. 



Rye. 



Oats. 



Corn. 



Grass. 



None 



27 



3,693 



4 



7 



1,601 



2,965 



3,308 



Little 



63 



3, 201 



2 



18 



1,776 



2, 689 



2,813 



Moderate 



45 



2,450 



1 



19 



1, 804 



2,536 



2,504 





46 



2, 631 



1 



22 



2,185 



2,870 



3,110 



Great 



5 



3, 742 





35 



. 2,265 



3,091 



2,477 



Verv great 



3 



4, 369 





87 



2, 986 



4,112 



3,405 



Nearly complete 



2 



2,688 





6 



2,084 



3,913 



3,225 















In that region there was no recognizable increase of the wheat 

 area with the increase of injury to meadows and pastures, but 

 there was a distinct enlargement of the area of oats, from 1,601 

 acres where the grass injury was "nothing" to 2,265 where it was 

 "very great." Corn, on the other hand, neither rises nor falls, 

 but the grass itself falls from 3,308 to 2,477 acres per township — 

 decreasing, that is, in about the same ratio as that in which the 

 oats increase. If we may draw any inference from these figures, 

 it must be that when chinch bugs are excessively numerous, grass 

 lands adjoining oats are especially liable to injury, and that this 

 damage is consequently greatest where oats fields are most common. 

 It is entirely possible that, in this increasing oats acreage, we see 

 reflected the facts observed in the field with respect to the spring 

 breeding of chinch bugs in oats in this worst infested region, — 

 this crop taking the place of wheat, in part, as food for the first 

 generation. It is also possible that the amount of wheat grown has 

 its influence, but that this is masked by the greater effect of differ- 

 ences in the other crop. 



Table YI. 



Central Illinois, 397 Towns. Injury to Grass, 1887, compared 

 with Crop Areas for the Same Year. 



Degree of Injury. 



No. 

 of Tps. 



Wheat. 



Barley. 



Rye. 



Oats. 



Corn. 



Grass. 



Little 



Moderate 



319 

 58 

 12 

 8 



1,620 

 2,113 

 1,960 

 3,52;3 



1 



2 



83 

 42 

 30 

 35 



2,575 

 1,951 

 1,680 

 1,924 



5,507 

 4,139 

 3,792 

 5,270 



5,825 

 4, 960 

 5,199 

 6,432 











In the central part of the State where we are limited to de- 

 grees \oi injury not higher than "considerable," and where, it is 

 S. E.— 2a 



