——_ SS ae 
= 3 
Cient control organizations, recruited largely from unemployed loggers 
from nearby lumbering operations that have closed down. It is expected 
that both jobs will be completed on schedule. 
Control work reduces losses in Sierra National Forest.--"A recruise 
of Plot 7 on the Sierra Forest, which was covered by control work during 
the winter of 1931-32, was made during the month (March) by K. A. Salman 
with the assistance of P. C. Johnson, F. W. Bacon, R. L. Furniss, and 
E. F. Wohletz," reports J. M. Miller, Berkeley, Calif. "The tree losses 
for 1932, following control work, were found to be 64 percent less than 
those for 1931, preceding control. * * * It was found that very few ag— 
gressive western pine beetle broods were represented in the 1932 overwin-— 
tering infestation, the greater number of the trees having been killed 
by flathead infestation which attacked trees previously topkilled. The 
following is an analysis of insect—caused losses on the plot for the past 
three years: 




peeee MON Pondarassepine Sie Ge Sugar pine 
|__Brood trees __|_____Topkills__|__Brood trees___|__Topkills 
Year |Trees {Volume ||Trees [Volume |Trees | Volume | Trees _| Volume 
|Number|Cu. ft. [Number | Cu. ft./Number| Cu. ft. [Number |Cu. ft. 
| | | | 
fee0 | 215) °82,190 | *«— 9 | == | T| 680 _~ -- 
1931 | 572 (493,500 | 494 /|480,'780 | He “UPS 0 Pie ee et ea LOS 
Meer 181 950 |) 59" 74,710 La TeLOO 2) oh, e298 

1932 
Of the 1931 topkills, 129 became 1932 brood trees. Six of the 1932 
topkills cruised early in the season became 1932 brood trees of the late 
summer or winter broods. The figures given in the table show the great 
reduction in topkilling, which indicates reduction in activity of Ips 
that took place in 1932. Figures for topkills in 1930 are not availa-— 
ble," 
CEREAL AND FORAGE INSECTS 
Ohio River floods may aid in dispersing corn borer.--D. J. Caf- 
frey, Toledo, Ohio, reports that "in March floods along the upper reaches 
of the Ohio River and its tributaries reached much higher levels than 
during the past several seasons. It will be recalled that one explana-— 
tion for the origin of some of the isolated Pyrausta nubilalis Hbn. 
infestations found closely adjacent to the Ohio River in Kentucky, south- 
ern Indiana, West Virginia, and southern Ohio, has been attributed to 
probable water carriage of infested corn residues. In 1920 it was demon— 
strated that 33 percent of the P. nubilalis larvae contained in corn— 
stalks floating in water for 28 days in late February and early March, 
produced moths. A total of 3.6 percent produced moths from cornstalks 
floating in water for 36 days, from March 15 to April 21. A total of 
1.1 percent produced moths after floating in water for 43 days, from 
March 9 to April 21. In 1926 additional field work by P. A. Howell, of the 
