THE STAGES OF ERANNIS VANCOUVERENSIS (LEPIDOPTERA: GEOMETRIDAE) AND LIFE HISTORY NOTES

1973 ◽  
Vol 105 (4) ◽  
pp. 605-612 ◽  
Author(s):  
David Evans
Keyword(s):  
British Columbia ◽  
Life History ◽  
Virus Disease ◽  
Pupal Stage ◽  
Early Spring ◽  
Deciduous Trees ◽  
Life Stages ◽  
Larval Instars ◽  
Central California ◽  
Young Leaves

AbstractErannis vancouverensis Hulst occurs from northern British Columbia to central California, and has been occasionally reported at infestation levels. The larvae feed on young leaves of several species of deciduous trees; winter is passed in the egg or sometimes in the pupal stage; adults emerge during late autumn or occasionally during winter or early spring; females are wingless. The life stages, including larval instars, are described here in detail. Virus disease and parasitism by tachinid flies help control the species.

Life History, Habits, and Damage of the Boxelder Leaf Gall Midge, Contarinia negundifolia Felt (Diptera: Cecidomyiidae) in Michigan

1966 ◽  
Vol 98 (7) ◽  
pp. 777-784 ◽  
Author(s):  
Louis F. Wilson
Keyword(s):  
Life History ◽  
Gall Midge ◽  
Pupal Stage ◽  
Head Capsule ◽  
Larval Instars ◽  
Acer Negundo ◽  
Stage Of Development ◽  
Young Leaves ◽  
Host Mortality ◽  
Third Instar Larvae

AbstractThe boxelder leaf gall midge is univoltine in Michigan. Adults emerge after the first few warm days in April, and deposit numerous eggs within the folded young leaves of boxelder (Acer negundo L.). Larval eclosion occurs a few days later, and gall development begins shortly after. Head capsule measurements revealed three larval instars. Third-instar larvae drop to the ground near the end of May, work their way into the soil, and construct cocoons. Pupation occurs in late August, and overwintering takes place in the pupal stage. Because oviposition occurs almost always on leaves in a certain stage of development and an estimated 50% of leaves will therefore escape attack, host mortality apparently cannot be caused by this insect.

A VIRUS DISEASE OF RHUBARB IN BRITISH COLUMBIA

1967 ◽  
Vol 45 (7) ◽  
pp. 1059-1061 ◽  
Author(s):  
R. Stace-Smith ◽  
G. G. Jacoli
Keyword(s):  
British Columbia ◽  
Mosaic Virus ◽  
Electron Micrographs ◽  
Myzus Persicae ◽  
Virus Disease ◽  
Turnip Mosaic Virus ◽  
Rheum Rhaponticum ◽  
Young Leaves ◽  
Fraser Valley ◽  
Test Plants

Severe mottling and stunting was observed in a planting of rhubarb (Rheum rhaponticum L.) in the lower Fraser Valley of British Columbia. A virus was mechanically transmitted from the young leaves of infected plants to a range of herbaceous test plants. The virus was also transmitted by the aphid Myzus persicae Sulz. from rhubarb to petunia and back to rhubarb seedlings. From the symptoms on herbaceous hosts, transmission by aphids, and measurements of electron micrographs, the virus was identified as turnip mosaic virus. Reciprocal serological reactions with type isolates of turnip mosaic virus confirmed this.

Identifying Climatic Controls on Ring Width: The Timing of Correlations between Tree Rings and NDVI

2008 ◽  
Vol 12 (14) ◽  
pp. 1-14 ◽  
Author(s):  
R. K. Kaufmann ◽  
R. D. D’Arrigo ◽  
L. F. Paletta ◽  
H. Q. Tian ◽  
W. Matt Jolly ◽  
...  
Keyword(s):  
Life History ◽  
Tree Rings ◽  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
Ring Width ◽  
Early Spring ◽  
Deciduous Trees ◽  
Tree Ring Width ◽  
Late Fall ◽  
The Relationship

Abstract The authors examine the effects of latitude and life history on the timing of relationships between satellite measures of normalized difference vegetation index (NDVI) and ground-based measures of tree-ring width in forests at mid- and high latitudes in the Northern Hemisphere. Results indicate a correlation between NDVI and tree rings over the entire growing season for all areas analyzed. For sites south of 40°N, a correlation appears in early spring and late fall while a correlation appears during summer months north of 40°N. For conifers, the correlation appears in summer while deciduous trees show the relationship during early spring and late fall. Of these two correlations, the effect of life history seems to dominate the effect of latitude. The timing of these correlations may help clarify the relationship between climate and tree rings and the effect of canopy duration on carbon uptake by trees.

The Life History of Onesia accepta Malloch (Diptera, Calliphoridae)

Parasitology ◽  
1933 ◽  
Vol 25 (3) ◽  
pp. 342-352 ◽  
Author(s):  
Mary E. Fuller
Keyword(s):  
Life History ◽  
Pupal Stage ◽  
Body Cavity ◽  
The Body ◽  
External Morphology ◽  
Feeding Period ◽  
Larval Instars ◽  
The Third ◽  
History Of

The life history of Onesia accepta Mall. is described. This species is parasitic on the earthworm Microscolex dubius Fletcher. The first and second larval instars are passed under the skin and the third instar in the body cavity of the host. The feeding period of the maggot is approximately 20 days, and the pupal stage about 12 days.The external morphology of the three larval instars and of the puparium is described in detail.

The Life History and Immature Stages of Synergus pacificus McCracken and Egbert (Hymenoptera: Cynipidae)

1965 ◽  
Vol 97 (2) ◽  
pp. 185-188 ◽  
Author(s):  
David Evans
Keyword(s):  
British Columbia ◽  
Life History ◽  
Pacific Coast ◽  
Immature Stages ◽  
Central California ◽  
Larval Stages ◽  
The Pacific

AbstractSynergus pacificus McCracken and Egbert (Hymenoptera: Cynipidae) is an inquiline of oak gall cynipids in the Pacific Coast area from southern British Columbia to central California. Approximately 1,000 specimens were examined during the course of this study. Descriptions of the egg and larval stages are given, and information on life history and ecology is presented.

scholarly journals Water immersion tolerance by larval instars of stable fly, Stomoxys calcitrans, L1758 (Diptera: Muscidae) impairs the fitness performance of their subsequent stages

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Steve B. S. Baleba
Keyword(s):  
Life History ◽  
Environmental Factors ◽  
Life History Traits ◽  
Water Immersion ◽  
Larval Instar ◽  
Stomoxys Calcitrans ◽  
Stable Fly ◽  
Life Stages ◽  
Larval Instars ◽  
First Instar

Abstract Background In holometabolous insects, environmental factors experienced in pre-imaginal life stages affect the life-history traits within that stage and can also influence subsequent life stages. Here, I assessed tolerance to water immersion by the larval instars of the stable fly, Stomoxys calcitrans L. (Diptera: Muscidae) and its impact on the life-history traits of their subsequent life stages. Results After submerging the three larval instars of S. calcitrans in distilled water, I found that the first instar larvae remained active for longer as compared to the second and third instar larvae. Also, the first instar larvae took a longer period to recover from the stress-induced immobility when removed from the water and returned to ambient temperature. When I followed the development of individuals of each larval instar that survived from water immersion, I found that their developmental time, weight, pupation percentage, adult emergence percentage and adult weight were negatively affected by this stressor. However, the weight of S. calcitrans adults developed from immersed first larval instar individuals was not affected by water immersion whereas their counterparts developed from immersed second and third larval instars had lower body weight. This suggests that in S. calcitrans, water immersion stress at the earlier stage is less detrimental than that experienced at late stages. Conclusion This study provides a comparative overview of the fitness consequences associated with water immersion stress during S. calcitrans larval ontogeny. The results prove that the fitness shift induced by water immersion in S. calcitrans is stage-specific. My results illustrate the importance of considering each larval instar when assessing the impact of environmental factors on holometabolous insect performance as these may be decoupled by metamorphosis.

Two-Year Life Cyle of Pseudohazis eglanterina (Boisduval) (Lepidoptera: Saturniidae)

1958 ◽  
Vol 90 (2) ◽  
pp. 125-127 ◽  
Author(s):  
David Evans
Keyword(s):  
British Columbia ◽  
Life History ◽  
Life Cycle ◽  
Pupal Stage ◽  
Conclusive Evidence ◽  
Life History Pattern ◽  
Specimen Material

A considerable amount of literature has been published on the genus Pseudohazis and its species but there is only one brief mention of the possibility of a two-year life cycle (Dyar 1904). Several rearings of P. eglanterina form normalis Dyar, completed by the author, have provided conclusive evidence that a two-year cycle is the usual life history pattern in southwestern British Columbia. One such rearing is herein described. This two-year cycle, the first winter in the egg stage and the second winter in the pupal stage, is not in phase as mature larvae and adult moths may be found in the same area at the same time. Detailed descriptions of larval and adult stages are in Dyar 1894 and Packard 1912. Acknowledgment is due to Dr. E. G. Munroe, Unit of Systematic Entomology, Ottawa, for his assistance in reviewing literature and specimen material

scholarly journals Life History Phenology and Sediment Size Association of the Dragonfly Cordulegaster dorsalis (Odonata: Cordulegastridae) in an Ephemeral Habitat in Southwestern British Columbia

2006 ◽  
Vol 120 (3) ◽  
pp. 347 ◽  
Author(s):  
Laurie B. Marczak ◽  
John S. Richardson ◽  
Marie-Claire Classen
Keyword(s):  
British Columbia ◽  
Life History ◽  
Life Cycle ◽  
Systematic Sampling ◽  
Limited Evidence ◽  
Larval Instars ◽  
Sediment Size ◽  
Ephemeral Habitat ◽  
Organic Sediments ◽  
One Year

The life cycle of the dragonfly Cordulegaster dorsalis was studied over one year by systematic sampling of larvae in three intermittent headwater streams in southwestern British Columbia. We determined that larvae normally take three years to reach maturity, emerging throughout July and August. There is limited evidence suggesting a split cohort development, with early emergence after two years. Additionally, we tested whether larval instars were distributed randomly or if they occupied different sediment microhabitats. Smaller animals tend to be associated with smaller grained organic sediments, although there was high variation between the streams.

The life history, distribution and morphological updates of horned poppy feeder Acentrus histrio (Schoenherr, 1837) (Coleoptera: Curculionidae: Curculioninae)

2021 ◽  
Vol 29 (1) ◽  
Author(s):  
LEVENT GÜLTEKİN ◽  
MELEK GÜÇLÜ ◽  
NESLİHAN GÜLTEKİN ◽  
BORIS KOROTYAEV
Keyword(s):  
Life History ◽  
Host Plant ◽  
Host Plants ◽  
Early Spring ◽  
Female Genitalia ◽  
Morphological Description ◽  
Weevil Species ◽  
Young Leaves ◽  
New Generation ◽  
First Time

The augmented morphological description of the weevil species Acentrus histrio (Schoenherr, 1837) is provided and supplied with photographs of the terminalia and genitalia of both sexes. Female genitalia are described for the first time. Glaucium grandiflorum Boiss. & A. Huett and Glaucium corniculatum (L.) Rudolph (Papaveraceae) are reported as the host plants in Turkey. The adults emerge from the soil in very early spring, locate the host plant, feed on young leaves and buds, mate on the host plant, and females deposit eggs inside the seed capsules. The larvae feed with seeds, mature larvae leave capsules entering soil to pupate, and adults of the new generation hibernate in the soil at the root base of the host plant. This species is univoltine and produced one generation annually in eastern Turkey. Acentrus histrio is newly recorded for Azerbaijan, and A. boroveci Košťál, 2014, for Tajikistan.

Tetrastichus garryana Burks (Hymenoptera: Eulophidae) Parasite of an Oak Gall-Wasp, Besbicus mirabilis (Kinsey)

1963 ◽  
Vol 95 (9) ◽  
pp. 1002-1005 ◽  
Author(s):  
David Evans
Keyword(s):  
British Columbia ◽  
Life History ◽  
General Group ◽  
Gall Wasp ◽  
Larval Instars

AbstractThe life history and the later larval instars of Tetrastichus garryana Burks (Hymenoptera: Eulophidae) are described and figured. The parasite has been collected from several species of oak gall cynipids, to which general group it seems to be restricted. In British Columbia it is most commonly associated with the gall-wasp Besbicus mirabilis (Kinsey).

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