- -S13- 
arid tree growth preceding the 1941 season, .. Another is the .shortening of the 
period -of seasonal ^activity in 1941,. owing' to .a .very., late cold spring and ab~ 
.-normally low; temperatures ■ during.. the -suraner, Because of those weather condi- 
tions the -western pine ..beetle ..failed ,to .complete/ its' 'normal number of seasonal 
generations. At the .higher -elevations,.' '‘where the. .mountain pine beetle produces 
•normally-. one.., eo.'pieti . seasonal Melioration, the broods ..failed' to emerge - during 
the summer- and full of 194l and . carried.9throug4 ’.'into the*wihter- ; period. This 
condition also applied to . the Jeffrey pine beetle in; the higher eievatiehs, but 
-•general-momentum of . the epidemic was such that ' there was .no . marked decrease in 
timber.: losses ? .. ■-■ - . • ■'/ 
- Other forest insects in this region' were" somewhat, erratic in behavior dur- 
. irig/the season. One of .the more : striking events of 194l was ' the appearance of 
expensive killing of nature!, reproduction, in burns . resulting from an epidemic o 
a weevil, Oylindrocopt urus . ea-toni . Such, (J. M,. Miller Bureau .of Entomology end 
Plant Quarantine. CJ„ S 0 D ft aV ) 
• LARCH SAhJIY The, larch... .saw fly was reported fihst. from the Flathead 
National forest, near the- Canadian border, in 1933-* It' is believed that prior 
to that time- the- insect was recorded in we s-tern Canada to the north of the 
. Elathe ad Eere st- o ; Since -its discovery throughout the northern- Rocky Mountains 
it- has-.- spread to the south and west,, until at this time, there are few larch 
- stands in Idaho and Montana that have, .-escaped defoliation. In some areas the 
• .-.injury has been -.sever a,- while in. others, the insect population has not developed 
to destructive numbers, ( J . C . Evenden, Bureau of Entomology and Plant Quaran- 
tine,. :U, S 0 D. A,) 
.A- SAlfELY 0 ~-- Gilninia frutetorun E. seems to be well .distributed throughout 
New -York end. the t southern half of New England,, having been found in- many of the 
. older ..plantations -of red ana Scotch pine through those' areas,. Little change 
has been noted since 1940 -in the. status of infestations under observation. 
Heavy feeding occurred lat’e in the 'season in one red pine ‘plantation in 
Southington, Conn, Based, on laboratory rearings and 'dissections of cocoons 
collected in this infestation, .there was an adult ..emergence between July 1 and 
September 1, lob!, of about- 47 percent', and about 17*5 percent have remained 
in .diapause for hibernation through the second winter, 
• Mjcroplectron. . fuscipennjs : Zeft, , a cocoon parasite 'which was imported 
from Europe; and coLoni zed in tpemqndous numbers throughout the spruce sa.wfly in- 
fested areas in this country -and in Canada, has become established in many of 
the sawfly infestations* ’ particularly in Connecticut, (R. C„ Brown, Bureau of 
•Entomology and; Plant. . Queranfine, U, S, D,.A, ) 
GYPSY MOTH, .--Thp hatch, of., the. egg clusters, of the 'gypsy* math.', in 194l was 
variable, owing, to abnormal w.e.nth.»3r_ conditions. Many of the egg clusters de- 
posited late in the .summer and ..early' in the fall : of .1940, and some during the 
first part of October , - were subjected , to freezing .temperatures before ■ embryo- 
logical development was complete’ -hence a -considerable mortality resulted. Egg 
clusters tub- were fully .developed ..before' thef .'early ..c.old in. the. fall of 1940 
showed a high ^--'rcentage of hatch in the spring of 1941, Hatching was 10 *o JU. 
. days ..'earlier -than -porraal^ and .late, spring ..larvnl aortali ty occurred- in .many 
localities. 
