-3.7- 
IDAHO 
Alfalfa weevil damage in the lower Snake River Valley of western 
Idaho was negligible in 1937. affecting only about 2 percent of the 
fields. The injury was largely concentrated in Ada County. Approxi- 
mately 10. percent of fields in eastern Idaho (upper Snake River Valley) 
were injured, "but only in Bingham County was the damage severe. 
The survey in eastern Idaho again included parts of five counties, 
viz, Bingham, Bonneville, Jefferson, Madison, and Fremont. The first 
two counties were treated as a subdistri.ct , "because a somewhat longer 
growing season occasionally permits harvest of three alfalfa crops. The 
other three counties are strictly two-crop areas and were treated as a 
separate .subdi strict. In Bonneville and Bingham Counties (table 3) po- 
tentially injurious weevil populations existed in approximately one- 
fourth of the fields examined. " Fall abundance of viable parasite cocoons 
promised highly effective parasltization for 1932. 
Table' 3 — Survey results, Bingham, and Bonneville Counties, 
Idaho, sampled September 13-1*+. 1937 
Field No. 
H.. postica 
adul t s 
B. curculionis cocoons 
Present 
Viable 
Number 
Number 
Number 
1 
2 
i+ Z 1 1 Z _ 1 
5 
6 
8 
9 
10 
11 
12 
13 
Average - 
1.0C 
•75 
1.75 
1.00 
2.50 
2.50 
1.00 
.25 
• 75 
1.00 
1.25 
•75 
3.00 
H.50 
17.75 
21.75 
U.50 
10.25 
5.25 
2.00 
3.50 
1.00 
19.50 
16.50 
12.00 
3.75 
3.25 
U.75 
3.75 
.50 
2.00 
2.75 
1.00 

.50 
U.50 
2.00 
2.25 
•50 
1.35 
9.U0 
2.13 
In Jefferson, Madison, and Fremont Counties (table U) one- third 
of the fields surveyed were populated by a menacing number of weevils, 
and considerable damage for 1938 was indicated. Viable parasite cocoons 
were sufficient to minimize production of new-generation weevils in 1938. 
UBRARY 
v£ PLANT BOARD 
