. Cooperative economic insect report. Insect pests Control United States Periodicals. californica (Bdv.), was epidemic in 1959 on snowbrush at widely separated localities in Oregon. Severe defoliation was reported from the Deschutes, Willamette, and Fre- mont National Forests. Flights of the butter- fly attracted much attention during late August and early fN 12 Figure 5. A seed chalcid, Megastigmus sp., in seed of noble fir. Figure 6. Damage to cones of Douglas-fir caused by the Douglas- fir cone moth, Barbara colfaxiana Kearf. California Highlights 1. Timber losses caused by seve
. Cooperative economic insect report. Insect pests Control United States Periodicals. californica (Bdv.), was epidemic in 1959 on snowbrush at widely separated localities in Oregon. Severe defoliation was reported from the Deschutes, Willamette, and Fre- mont National Forests. Flights of the butter- fly attracted much attention during late August and early fN 12 Figure 5. A seed chalcid, Megastigmus sp., in seed of noble fir. Figure 6. Damage to cones of Douglas-fir caused by the Douglas- fir cone moth, Barbara colfaxiana Kearf. California Highlights 1. Timber losses caused by several species of bark beetles were the highest of any recent year. Tree-killing will prob- ably increase in I960. 2. Epidemic infestations of the lodgepole needle miner continued unabated at Yo- semite National Park. Aerial spraying at Tuolumne Meadows suppressed populations and prevented tree-killing in this valued recreational area. 3. Widespread infestations of the black pine leaf scale developed in Stands of sugar pine at several places in the state; damage in local areas was severe. 4. The density of spruce budworm popu- lations increased in the Warner Mountains. If this situation continues, aerial spraying may be needed to protect the fir resources. 5. The sugar pine cone beetle destroyed a large percentage of the sugar pine cone crop; other cone and seed insects took toll of seeds of other conifers. 6. An incipient outbreak of the pandora moth was discovered in San Diego County -- the first in the State for several years. Outbreaks Of Western Pine Beetle Severe After several years of low losses, the western pine beetle, Dendroctonus brevicomis Lee, developed many serious outbreaks in ponderosa and Coulter pine across Califor- nia. One of the most serious was on the Sierra National Forest from 4,000 to 6,000 feet elevation, where groups of trees, some- times including 20 or more, were attacked. In Siskiyou County, infestations increased on several thousand acres. Heavy grou
Size: 1425px × 1753px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
