CROPS AFFECTED. 15 
proportion of different species is shown in the following table, kindly 
furnished for my use by Mr. Wildermuth: 
Record of leafhopper sweepings in the fall of 1908, by V. L. Wildermuth. 
z # \3 
es a | Re 
oO ~ 
seycd 3 ~ aw = g g 
Date. cS B 2/88 af bss ul es r=) 
AS A, Soa er aga NE eee Wee (ei) ee 2 
ai b ale |sxz12/Slalsi/4]e 
o o n o es ~ a van = =| 
2 Seohals (BOISE Lehelous 
g g 3 = R a ° eG a) ‘= ww 
3 = 5 |} ® Bi = ia} La |S | 8 
a Z oO}A A Alloa; }oO] a 
Oct. 3:1 
TSAR CORO Se cro y> swe eae cea, = Satake 302 1, 022, 288 6 200 75 | 10] 8 7|40|0 6 
BECOUUGLECOLG 2 3. foecas once cee sommes 285 727,640 | 13 | 125 80 | 25 | 4 10 | 15] 3 10 
Average of two counts.....-..--..-- 318 874,964 | 10} 163 78) 18} 6] 8] 28) 13 8 
Oct. 13:2 
IDES et) (0 ee ee Se eee ee 370 | 1,174,480 | 10} 200 50 | 30 }15 | 20} 30] 5 10 
HECOMMMTOCOL Monet snes ce sesccc ence = 571 | 1,658,184 | 10] 385 30 | 35 |20 | 18] 40] 8 25 
Average of two counts...........--. 471 1,416,332 | 10 | 292 40 | 33 |17 | 19 | 35 | 6 18 
Oct. 18:3 tank fT Pare Da to 
TOTES TES (0) 0 Dee BEES Dee eee co ae ete 748 | 2,172,192 | 15 | 596 2/174] 0 2 | 19 |36 4 
BECOHUMeCOLOGcser sendin ore soe. 538 1, 562,352 | 10 425 515010 3 | 25 |20 0 
ABPOCONG = fa Sec euice tebe jaece age 653 1,896, 312 | 20 | 500 1 }100 | 0 5 | 15 110 2 
Average of three counts.........--- 646 | 1,876,952 | 15 | 507 3175] 0 3 | 19 |22 2 
Oct. 25 (cool day): 4 
DIrSinOCOMMee sa ace cence costes te 354 | 1,028,016 | 25 | 300 0} 20) 0 Ol 'S170 1 
Second record --| 418] 1,218,872] 10} 356 2{| 45/1 0; 01,0 4 
pninGereCOlLW ence canes eas core scee ce 303 879,912 | 30} 250 0/10) 0 oP Gee 2 
Average of three counts.........--- 358 | 1,040,600 | 22 | 302 20 | Pe (PeeeS: | eee 2 
| 
1 Lowland timothy, fairly short. 3 Upland timothy, grass eaten short. 
2 Timothy and bluegrass, Ohio State University Farm. 4 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 leafhoppers. 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 Dreculacephala 
29460°—Bull. 108—12——2 
