-1+U- 
COLORADO 
Of the first alfalfa crop in Mesa, Delta, and Montrose Counties, 
5, 25, and 5 percent, respectively, experienced slight economic damage 
fron the alfalfa weevil in 1937* Damage was expected in 75 percent of 
the Mesa County fields but failed to materialize because of drastic 
winter kill of adult weevils present in the fall of 193&. In Delta 
County (table 10) approximately one-fourth of the surveyed fields were 
occupied by threatening weevil populations. Parasites promised to be 
effective in curtailing production of weevil adults from first-crop 
larvae. ... ,::.-■. 
Table 10. — Survey results. Delta County. Colo., sampled 
November 22-^0. 19 T7, , 
Field -No. 
3 
4 
5 
6 
7 
8 
9 
10 
11 
12 
13 
lU 
15 
16 
17 
18. 
19 
20 
Average 
H-. postica 
adults 
'Number 
,50 
50 
25 
75 
50 
25 
•75 
-.50 
•75 
.50 
.00 
.25 
.2.5 
.25 
.50 
•50 
.00 
.75 
.50 
.50 
B. curculionis cocoons 
Present 
1.46 
Number 
5-J5 
• 75 
.'75 
7-75 
•75 
• 
1.75 
6.75 
.50 
10.75 
1.25 

.50 
3-75 
14.25 
3.25 
.25 
11.75 
9.25 
9.50 
2.00 
U.35 
Tiable" 
Number 
2.00 
•75 

5.75 
.25 
1.00 
1.25 
.25 
1.25 
1.00 

•25 
.75 
.75 
.25 
5.00 
3.25 
4.25 
.50 
1.26 
