Laboratory Evaluation of DDT and Phosphamidon on the Western Hemlock Looper, Lambdina fiscellaria lugubrosa (Hulst)

1963 ◽  
Vol 95 (4) ◽  
pp. 365-371 ◽  
Author(s):  
A. P. Randall ◽  
C. Jackson
Keyword(s):  
Aqueous Solution ◽  
Systemic Toxicity ◽  
High Order ◽  
Fuel Oil ◽  
Western Hemlock ◽  
Laboratory Evaluation ◽  
Spray Tower ◽  
Western Hemlock Looper ◽  
Lambdina Fiscellaria Lugubrosa ◽  
Hemlock Looper

AbstractSpray tower application of DDT in fuel oil at 0.2 lb. DDT/acre, proved to be highly toxic to the larvae of the western hemlock looper. Tolerance to DDT appeared to vary directly with larval age. Phosphamidon applied in aqueous solution to hemlock foliage showed a high order of contact and systemic toxicity to larvae placed on the treated foliage.

CHAETOPHLEPSIS NASELLENSIS, A DIPTEROUS PARASITOID OF THE WESTERN HEMLOCK LOOPER (LEPIDOPTERA: GEOMETRIDAE)

1977 ◽  
Vol 109 (8) ◽  
pp. 1121-1128
Author(s):  
Richard D. Medley ◽  
V. M. Carolin
Keyword(s):  
Body Length ◽  
Field Studies ◽  
Instar Larva ◽  
Western Hemlock ◽  
Larval Instars ◽  
First Instar ◽  
Western Hemlock Looper ◽  
Lambdina Fiscellaria Lugubrosa ◽  
Hemlock Looper

AbstractPreserved material from 1962 field studies provided information on the habits and morphology of the tachinid parasitoid Chaetophlepsis nasellensis Reinhard. Parasitization of the larvae of the western hemlock looper, Lambdina fiscellaria lugubrosa (Hulst), continues over a 30- to 40-day period. Maggots issue from the host larvae and drop to the ground to pupate. The pupae normally overwinter, with adults emerging the following spring or summer. The early first-instar larva differs markedly from the late first-instar. The three instars can be distinguished on the basis of body length and the structure and form of the buccopharyngeal apparatus. The first and third larval instars and the puparium are distinctive enough to permit easy identification during studies of the western hemlock looper and associated loopers.

SAMPLING WESTERN HEMLOCK LOOPER PUPAE (LEPIDOPTERA: GEOMETRIDAE) USING BURLAP TRAPS

1989 ◽  
Vol 24 (3) ◽  
pp. 348-354 ◽  
Author(s):  
Terry L. Shore
Keyword(s):  
Sample Size ◽  
Surface Area ◽  
Significant Relationship ◽  
Tsuga Heterophylla ◽  
Western Hemlock ◽  
Tree Diameter ◽  
Breast Height ◽  
Western Hemlock Looper ◽  
Lambdina Fiscellaria Lugubrosa ◽  
Hemlock Looper

Burlap wrapped around western hemlock, Tsuga heterophylla (Raf.) Sarg., trees at breast height was used to trap pupae of the western hemlock looper, Lambdina fiscellaria lugubrosa (Hulst). The number of pupae in the traps was highly variable and was not related to tree diameter or the surface area of the trap. There was a significant relationship between the number of viable pupae per trap and the number of healthy western hemlock looper eggs subsequently laid on lichen in the trees. Sample size requirements are presented.

Sex pheromone of the western hemlock looper,Lambdina fiscellaria lugubrosa (Hulst) (Lepidoptera: Geometridae)

1993 ◽  
Vol 19 (5) ◽  
pp. 1009-1019 ◽  
Author(s):  
Gerhard Gries ◽  
Regine Gries ◽  
Sh�n H. Krannitz ◽  
Jianxiong Li ◽  
G. G. Skip King ◽  
...  
Keyword(s):  
Sex Pheromone ◽  
Western Hemlock ◽  
Western Hemlock Looper ◽  
Lambdina Fiscellaria Lugubrosa ◽  
Hemlock Looper

A VIRUS DISEASE OF WESTERN HEMLOCK LOOPER, LAMBDINA FISCELLARIA LUGUBROSA (HULST) (LEPIDOPTERA: GEOMETRIDAE)

1957 ◽  
Vol 3 (6) ◽  
pp. 799-802 ◽  
Author(s):  
S. M. Sager
Keyword(s):  
Incubation Period ◽  
Fat Body ◽  
Virus Disease ◽  
Infectious Agent ◽  
Western Hemlock ◽  
Short Period ◽  
Western Hemlock Looper ◽  
Nuclear Polyhedrosis ◽  
Lambdina Fiscellaria Lugubrosa ◽  
Hemlock Looper

Some observations have been made on the infectious agent, the histopathology, and the incubation period of a polyhedrosis in western hemlock looper larvae. External and internal symptoms are generally similar to nuclear polyhedrosis in other Lepidoptera. Infection is first detectable in fat body nuclei, other susceptible tissues being blood, hypodermis, and tracheal matrix. Larvae subjected to a short period of starvation just prior to oral infection show a shorter incubation period than non-starved larvae. The polyhedral inclusion bodies range from 0.5 μ to 5.0 μ in diameter. Electron micrographs of dissolved polyhedra show their contents to be largely rod-shaped viruses measuring approximately 40 mμ × 290 mμ.

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