Cone and Seed Insects of Western Forest Trees

Front Cover
U.S. Department of Agriculture, 1958 - Forest insects - 168 pages
0 Reviews
 

What people are saying - Write a review

We haven't found any reviews in the usual places.

Common terms and phrases

Popular passages

Page 102 - The egg as obtained by dissection of the female is white, smooth and spindleshaped with a very long pedicel at the anterior end and the vestige of one at the opposite end. Length of body of egg, .36 mm.; tail-like process, .9 to 1.2 mm. (Fig. 87). The full-grown larva is yellowish white with brownish mouth parts; its length varies from 2.5 to 3.5 millimeters. The surface is smooth 11 Wien. Ent. Zeit., XII., p. 24. without apparent sculpture and the hairs are very sparse...
Page 2 - DOANE, RW, VAN DYKE, EC, CHAMBERLIN, WJ, and BURKE, HE 1936. FOREST INSECTS.
Page 56 - Its result is completely to cut off the nourishment and insure the deadening of the cone, which produces the condition necessary for the development of the larvae.
Page 74 - Abies grandis in British Columbia by W. G. Mathers and the majority of the specimens reared from Abies concolor, Hopkins US No. 11430a, in California, it sometimes emerges after spending only one winter in the puparia. "According to the rearing records a few lonchaeids emerged from lots bearing Hopkins US Nos. 12538J and 12564e after the third winter season. Specimens of abietum were reared from both these lots and some may have remained 3 years in the pupal stage. over a period of 3 years. This...
Page 54 - ... cones attacked. While the cause appeared to be an entomophagous fungus it has not yet been reported definitely.
Page 75 - The species has the following combination of characters: Tarsi yellowish, calyptrae dark, eyes bare, one to several stigmatal bristles, sternoplueron haired on the disc, and notopleuron bare except for the usual two bristles. It is the smallest species discussed in this paper and, in the larval stage, the most general (apparently not the most abundant) pest of cones.
Page 111 - ... adults from this seed was quite similar to that observed in 1914. The maximum period of emergence in the laboratory occurred between April 20 and May 2. From cones which were kept caged over winter under outdoor conditions at the same elevation, the maximum emergence occurred between May i and 16. At elevations of 3,000 to 4,000 feet the emergence occurred during the latter part of May, and above 4,000 feet much of the emergence occurred in June. Many adult chalcidids were liberated at different...
Page 1 - ... Distribution: — The fir bark louse, or balsam woolly aphid as it is called in Canada, occurs generally throughout our Northeastern States and in Southeastern Canada wherever balsam fir is found (MacAloney, 1935). It is of European origin and was reported on the coast of Maine as early as 1908, by AD Hopkins, then chief of the Division of Forest Insect Investigations, Bureau of Entomology, US Department of Agriculture. Balch (1936) writes that "this insect was apparently introduced into North...
Page 76 - Frequently 4 or 5 larvae were found burrowing throughout the cone, feeding on cone tissue and seeds. When removed from the cone and placed on a flat plane, they often curled up, locking the anterior and posterior segments together. Release was sudden, and spring-like, moving the larva 1 or 2 inches.
Page 47 - ... mm. scopulorum Hopk. AA Elytra with the strial and interstrial punctures unequal in density and usually in size, those of the interspaces sparsely placed and usually smaller than those of the striae, especially on the dorsal area. Elytra with strial punctures in obscure rows on the lateral area; pronotum with punctures of posterior area fine; punctures of elytra distinct, those of the striae rather dense. B The declivity with the 1st interspace granulate; the hairs moderately long and erect;...

Bibliographic information