CROPS AFFECTED. 
15 
proportion of different species is shown in the following table, kindly 
furnished for my use by Mr. Wilderrnuth: 
Record of lea/hopper sweepings in the fall of 1908, by V. L. Wilderrnuth. 
Date. 
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Oct, 3: i 
352 
285 
1,022,288 
727, (MO 
6 
13 
200 
125 
75 
SO 
10 
25 
8 
4 
10 
40 
15 

3 
6 
10 
318 
874, 9G4 
10 
163 
7S 
18 
6 
8 
28 
11 
8 
Oct. 13:2 
370 
571 
1,174,480 
1,058,184 
10 
10 
200 
3S5 
50 
30 
30 
35 
15 
20 
20 
18 
30 
40 
5 
8 
10 
?s 
471 
1,416,332 
10 
292 
40 
33 
17 
19 
35 
6 
18 
Oct. 18:3 
748 
538 
653 
2,172,192 
1,562,352 
1,896,312 
15 
10 
20 
596 
425 
500 
2 
5 
1 
74 
50 
100 



2 
3 
5 
19 
25 
15 
36 
20 
10 
4 

?, 
046 
1,876,952 
15 
507 
o 
75 

3 
19 
22 
?, 
Oct. 25 (cool day): * 
354 
418 
303 
1,028,016 
1,213,872 
879, 912 
25 
10 
30 
300 
356 
250 

2 

20 
45 
10 

1 



3 
8 

6 


2 
1 
4 
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358 
1,040,000 
22 
302 
1 
25 
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5 
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1 
i Lowlaud timothy, fairly short. 
2 Timothy and bluegrass, Ohio State University Farm. 
3 Upland timothy, grass eaten short, 
* Upland timothy, grass fairly short. 
CROPS AFFECTED. 
While our survey is intended to cover the various cereals and forage 
crops, it must for a number of reasons be more complete for those that 
are of most general culture. In general, it may be stated that all of 
the crops belonging to the grass family and most of those in general 
cultivation belonging to the legumes are infested by one or another, 
often by many, species of the leaf hoppers. The abundance and 
corresponding injury vary greatly with these crops for different parts 
of the country and under different cultural conditions, as also with 
different seasons, so much so that general statements for annual crops 
are hardly applicable here. One of the most obvious conditions, 
however, is that the greatest drain occurs where, owing to continuity 
of crops or by close association of common food plants, there is offered 
an exceptional opportunity for the survival and increase of the insects 
from generation to generation through a season or during a series of 
years. 
For the wheat, oats, rye, and barley crops the most important- 
species are, in the North and Northwest, Cicadula 6-notata and 
Athysanus exitiosus, and in the South, A. exitiosus and Drxculacepliala 
29460°— Bull. 108—12 2 
