FIELD APPLICATION OF SYNTHETIC DOUGLAS-FIR TUSSOCK MOTH SEX PHEROMONE DID NOT REDUCE EGG PARASITISM BY TWO HYMENOPTERA

1979 ◽  
Vol 111 (6) ◽  
pp. 751-752 ◽  
Author(s):  
L. L. Sower ◽  
T. R. Torgersen
Keyword(s):  
Sex Pheromone ◽  
Host Finding ◽  
Douglas Fir ◽  
Field Application ◽  
Egg Masses ◽  
Egg Parasite ◽  
Tussock Moth ◽  
Orgyia Pseudotsugata ◽  
Synthetic Pheromone ◽  
Egg Parasitism

Telenomus californicus Ashmead is a major egg parasite of the Douglas-fir tussock moth, Orgyia pseudotsugata (McDunnough), throughout the host's range. This parasite is effective at finding host egg masses. Even when host insects are sparse, over 90% of egg masses may be attacked and 50% of the total egg complement destroyed (R.R. Mason and T.R. Torgersen, unpub.). In the southwest an undetermined Tetrastichus species can also be a significant egg parasite of the tussock moth. Because host finding might involve some degree of kairomonemediated behavior we were interested in any effect that synthetic pheromone, applied to disrupt mating of the host, might have on parasitism by these valuable species.

PHEROMONE DISRUPTION CONTROLS DOUGLAS-FIR TUSSOCK MOTH (LEPIDOPTERA: LYMANTRIIDAE) REPRODUCTION AT HIGH INSECT DENSITIES

1983 ◽  
Vol 115 (8) ◽  
pp. 965-969 ◽  
Author(s):  
L. L. Sower ◽  
G. E. Daterman ◽  
C. Sartwell ◽  
W. Funkhouser
Keyword(s):  
Untreated Control ◽  
Douglas Fir ◽  
Hollow Fibers ◽  
High Population ◽  
Tussock Moth ◽  
Orgyia Pseudotsugata ◽  
Synthetic Pheromone

AbstractHollow fibers containing synthetic pheromone (Z-6-heneicosen-11-one) were applied by helicopter to six plots of about 8 ha each. Douglas-fir tussock moth, Orgyia pseudotsugata (McDunnough), had reached such high population levels on the plots that trees in some areas were completely defoliated. Reproduction of the moths was reduced 71 and 81%, respectively, at dosages of 8 and 25 g of pheromone/ha relative to untreated control plots.

(Z)6, (E)8-Heneicosadien-11-One: Synergistic Sex Pheromone Component of Douglas-Fir Tussock Moth, Orgyia pseudotsugata (McDunnough) (Lepidoptera: Lymantriidae)

1997 ◽  
Vol 23 (1) ◽  
pp. 19-34 ◽  
Author(s):  
Gerhard Gries ◽  
Keith N. Slessor ◽  
Regine Gries ◽  
Grigori Khaskin ◽  
Priyantha D. C. Wimalaratne ◽  
...  
Keyword(s):  
Sex Pheromone ◽  
Douglas Fir ◽  
Pheromone Component ◽  
Tussock Moth ◽  
Orgyia Pseudotsugata

scholarly journals Early Warning System for Douglas-Fir Tussock Moth Outbreaks in the Western United States

2004 ◽  
Vol 19 (4) ◽  
pp. 232-241 ◽  
Author(s):  
Katharine A. Sheehan ◽  
Gary E. Daterman ◽  
John M. Wenz
Keyword(s):  
United States ◽  
Early Warning ◽  
Early Warning System ◽  
Warning System ◽  
Douglas Fir ◽  
Western United States ◽  
System Monitoring ◽  
Egg Masses ◽  
Tussock Moth ◽  
Orgyia Pseudotsugata

Abstract The Early Warning System is a pheromone-based trapping system used to detect outbreaks of Douglas-fir tussock moth (DFTM, Orgyia pseudotsugata) in the western United States. Millions of acres are susceptible to DFTM defoliation, but Early Warning System monitoring focuses attention only on the relatively limited areas where outbreaks may be developing. During 20+ years of monitoring, the Early Warning System provided warnings of 1–3 years for seven of nine outbreaks. No warnings were provided for two outbreaks because of inadequate density and distribution of Early Warning System plots in those specific areas. Plots should be evenly distributed over host-type forests at a density of at least 1 Early Warning System plot per 3,000 ac. After potential outbreaks have been identified by the Early Warning System, ground sampling for egg masses and larvae is necessary to characterize local DFTM populations. West. J. Appl. For. 19(4):232–241.

scholarly journals Impact of Biochar on Douglas-Fir Tussock Moth (Orgyia pseudotsugata Lepidoptera: Erebidae) Larvae Reared on Synthetic Die

Insects ◽  
2021 ◽  
Vol 12 (12) ◽  
pp. 1065
Author(s):  
Stacey Rice-Marshall ◽  
Stephen P. Cook ◽  
John Randall
Keyword(s):  
Weight Gain ◽  
Larval Mortality ◽  
Douglas Fir ◽  
High Concentration ◽  
Larval Weight ◽  
Synthetic Diet ◽  
Tussock Moth ◽  
Orgyia Pseudotsugata ◽  
Compensatory Feeding ◽  
Significant Difference

The use of biochar as a soil amendment in forest ecosystems can be beneficial in the restoration of degraded soils. Forest insects such as the Douglas-fir tussock moth, Orgyia pseudotsugata (McDonnough) (Lepidoptera: Erebidae), may be exposed to biochar when the material is applied. Two experiments were conducted using biochar either (1) applied to the surface of the diet at three rates (0, 5, and 10 mg) or (2) incorporated into synthetic diet at four rates (0, 10, 20, and 40% volume/volume). The objective of both experiments was to determine if biochar on the surface or incorporated into a synthetic diet affected development and survival of O. pseudotsugata larvae. In both experiments, there was a significant decrease in estimated time to larval mortality in all biochar treatments compared to untreated controls. In the surface-applied biochar experiment, there was a significant difference in larval weight gain at day 12 between the control and 10 mg biochar treatments. In the experiment with biochar incorporated into the diet, mean larval weight at day 12 was highest in the low (10%) biochar treatment compared to all other treatments, although weight gain was only significantly different between the low- and high-concentration (40%) biochar treatments. Our results suggest that larvae, feeding on a low amount of biochar in the synthetic diet, may respond by engaging in compensatory feeding behavior. Fewer surviving larvae in the biochar treatment groups may contribute to the lack of significance found in the comparison of weight gain at day 24 in each experiment.

PEST MANAGEMENT OF DOUGLAS-FIR TUSSOCK MOTH (LEPIDOPTERA: LYMANTRIIDAE): A SEQUENTIAL SAMPLING METHOD TO DETERMINE EGG MASS DENSITY

1984 ◽  
Vol 116 (7) ◽  
pp. 1041-1049 ◽  
Author(s):  
R. F. Shepherd ◽  
I. S. Otvos ◽  
R. J. Chorney
Keyword(s):  
Sampling Method ◽  
Mass Density ◽  
Sequential Sampling ◽  
Douglas Fir ◽  
Egg Mass ◽  
Tussock Moth ◽  
Incipient Stage ◽  
Orgyia Pseudotsugata ◽  
Detection Tool ◽  
Variability Data

AbstractA sequential egg-mass sample system for Douglas-fir tussock moth, Orgyia pseudotsugata McDunnough (Lepidoptera: Lymantriidae), was designed, based on visual scanning of the lower branches of Douglas-fir trees, Pseudotsuga menziesii (Mirb.) Franco. A branch was removed from each quadrant from the upper, middle and lower crown level, and from the lowest whorl of a total of 59 non-defoliated trees in 10 areas. No consistent trend in egg-mass density per branch could be found between crown levels and no level proved superior as a representative of the tree. Therefore, the lower whorl of branches was selected for survey purposes because of sampling efficiency. Sample stop lines were determined from egg-mass density and variability data collected on 55 sites and subsequent defoliation estimates were related to these densities. The system is designed as an early detection tool to be used only in non-defoliated stands at the incipient stage of an impending outbreak.

TOXICITY OF INSECTICIDES TO DOUGLAS-FIR TUSSOCK MOTH, ORGYIA PSEUDOTSUGATA (LEPIDOPTERA: LYMANTRIIDAE): I. CONTACT AND FEEDING TOXICITY

1979 ◽  
Vol 111 (10) ◽  
pp. 1145-1159 ◽  
Author(s):  
Jacqueline L. Robertson ◽  
Lucille M. Boelter
Keyword(s):  
Rhodamine B ◽  
Douglas Fir ◽  
Relative Toxicity ◽  
Spray Chamber ◽  
Population Response ◽  
Larval Stages ◽  
Tussock Moth ◽  
Orgyia Pseudotsugata ◽  
Rhodamine B Dye ◽  
Spray Volume

AbstractThe toxicities of 14 insecticides to selected larval stages of the Douglas-fir tussock moth were determined with a laboratory spray chamber. The toxicities of 10 were also determined in feeding bioassays. Younger instars were, in general, more susceptible to the toxicants. Significant differences in population response from 1973 to 1977 precluded a rigid interpretation of relative toxicity values in relation to the standard for comparison, DDT. Spray volume, formulation, and the presence of rhodamine B dye significantly affected toxicities of two of the materials, carbaryl and trichlorfon. The degree of exposure of larvae to bioethanomethrin and carbaryl significantly affected mortality.

THE EFFECT OF TEMPERATURE AND FOOD DEPRIVATION ON SURVIVAL OF FIRST-INSTAR DOUGLAS-FIR TUSSOCK MOTHS (ORGYIA PSEUDOTSUGATA) (LEPIDOPTERA: LYMANTRIIDAE)

1983 ◽  
Vol 115 (6) ◽  
pp. 663-666 ◽  
Author(s):  
Roy C. Beckwith
Keyword(s):  
Food Deprivation ◽  
Larval Survival ◽  
Douglas Fir ◽  
Effect Of Temperature ◽  
Rearing Temperature ◽  
Tussock Moth ◽  
Orgyia Pseudotsugata ◽  
First Instar ◽  
Starvation Conditions

AbstractMortality of neonatal Douglas-fir tussock moth larvae varied from 0% to 100% depending on the rearing temperature and duration of food deprivation. Lower temperatures apparently favor larval survival under starvation conditions. For each period of food deprivation, mortality occurs earlier as the temperature increases; this shift to earlier mortality was significant at P <.01. Some implications are discussed.

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