pe * iw 
Adults and eggs 
park, owing to its abundance during the camp season, 
O on Canyon in great 
of this insect were found in the Valley floor of Zi 
i 
, numbers during the latter part of March. Another insect caus sing con- 
cern in the camp ground areas of this park is an undetermined species 
of tent caterpillar which defoliates the cottonyood. This insect was 
also appearing in numbers late in March on cottonwoods along the Virgin 
River, below Zion Park, It was apparently too early, however, for the 
seasonal appearance of the insect in the upper Zion Canyon, 
Flatheaded borers 3 kill D Doug) as fir in Yosemite. —--During tkt hast 
oe years many nany Douglas fir trees growing in the Merced River Canyon and 
Yosemite Valley floor have been killed by the work of buprestid beetles, 
“mainly Melanophila drurmondi Koby. About 200 trees, infested by the 
larvae, were cut an ai Durned— in the park curing t he past winter through 
the use of CWA labor. ‘The seasonal history of Melanophila in this local- 
ity has not been fully deternined, but it is Worn that the larval 
period lasts two, and perhaps three, seas In order to obtain in- 
formation on the seasonal development of ie ins Nene Mr, DeLeon recently 
made a trip to the park and installed special rearing cages on infested 
‘trees, 
.Insect survey on ‘Sequoia National Park.--A forest insect survey is 
now being conducted on the Sequoia patonale Park. Because of the very 
rough topography of the watersheds of this park, systematic cruises by 
section line are extremely difficult and are possible only in a few 
small areas, A system of-spotting infested trees from vantage points 
‘is being employed, and an‘effort will be made definitely to fix the 
vantage points for certain areas for future work. By using field 
Glasses in connection vith a plane table map, it is possible to map the 
position of infested trees with considerable accuracy. 

Maintenance control in General Grant National aS Eig sMehepepinone soe 
control work on the General Grant National Park was c completed in March. 
Previous control work in-this national park has resulted in reducing 
the infestation of the mountain pine beetle in sugar pine to a very low 
point. It was:found that the overwintering infestation in the park 
consisted of less than 20 infested trees and these were cleaned up by 
a small crew working for about 2 weeks, 
White-pine weevil.—--H. J. MacAloney of the New Haven, Conn., field 
laboratory, reports: "The spring activities of Pissodes strobi Peck 
have started in the New England States. On April 18 two white-pine 
weevils were collected at Petersham, Mass,, feeding in buc clusters. 
Considerable search was made before these adults were Parent There 
were very few punctures in the two leaters and no eggs were found, 
No punctures were seen in any other leaders examined, On April 26 in 
a heavily infested plantation near Mew ees esis in quantity were 
found in many leaders and a Bpaee arab ie number of efults were found on 
many leaders It appears that the heevy covering of snow during the 
period of ag none! % veathner protected the hibernating weevils and, while 
there may not be an increase in the infestation this season, there very 
