THE NUMBER OF LARVAL STAGES OF THYMELICUS LINEOLA (LEPIDOPTERA: HESPERIIDAE) IN EASTERN CANADA

1978 ◽  
Vol 110 (12) ◽  
pp. 1293-1295 ◽  
Author(s):  
Jeremy N. McNeil
Keyword(s):  
Life Cycle ◽  
Prince Edward Island ◽  
Head Capsule ◽  
Developmental Time ◽  
Eastern Canada ◽  
Male And Female ◽  
Head Capsule Width ◽  
Larval Stages ◽  
Erroneous Interpretation

AbstractUsing Dyar’s Law the number of larval stages in the life cycle of the European skipper, Thymelicus lineola, was determined in Quebec (1974, 1975, 1976), Ontario (1976), and Prince Edward Island (1976). In all regions five larval stages were observed, as in Europe, and not six as previously reported in Ontario. Apparently in this latter case an erroneous interpretation of the significant differences existing between the sexes (relating to head capsule width and developmental time) resulted in male and female fifth stage larvae being considered as fifth and sixth stages respectively.

THE LIFE CYCLE OF CORTICEUS GLABER (COLEOPTERA: TENEBRIONIDAE), A. FACULTATIVE PREDATOR OF THE SOUTHERN PINE BEETLE, DENDROCTONUS FRONTALIS (COLEOPTERA: SCOLYTIDAE)

1982 ◽  
Vol 114 (6) ◽  
pp. 535-537 ◽  
Author(s):  
Michael T. Smith ◽  
Richard A. Goyer
Keyword(s):  
Life Cycle ◽  
Head Capsule ◽  
Developmental Time ◽  
Dendroctonus Frontalis ◽  
Southern Pine Beetle ◽  
Southern Pine ◽  
Mature Larva ◽  
Larval Instars ◽  
Pine Beetle ◽  
Coleoptera Tenebrionidae

AbstractThe life cycle of Corticeus glaber (LeConte) was investigated at 25 °C and 60% R.H. The developmental time from egg to adult for C. glaber ranged from 30 to 41 days and five larval instars were determined from head capsule measurements. The mature larva is described.

LARVAL GROWTH AND DEVELOPMENT OF ARGIA VIVIDA (ODONATA: COENAGRIONIDAE) IN WARM SULPHUR POOLS AT BANFF, ALBERTA

1977 ◽  
Vol 109 (12) ◽  
pp. 1563-1570 ◽  
Author(s):  
Gordon Pritchard ◽  
Brian Pelchat
Keyword(s):  
Life Cycle ◽  
Rapid Growth ◽  
Growth And Development ◽  
Larval Growth ◽  
Head Capsule ◽  
Temperature Dependent ◽  
Vernal Equinox ◽  
Larval Instars ◽  
Head Capsule Width ◽  
Major Shift

AbstractSamples of a population of Argia vivida Hagen larvae were taken at about monthly intervals from a series of warm sulphur pools at Banff, Alberta, from June 1973 to December 1974. Changes in head capsule width and wing pad length in field-collected and laboratory-reared specimens show that the life-cycle is univoltine. Only the final (Z) instar can be recognized with certainty, but methods are described whereby the population can be divided into size classes which are thought to correspond well with the last nine larval instars. Periods of rapid growth occur in the autumn and again in the spring. Larvae overwinter in the instars U, V, W, X, and Y and the major shift to the final instar occurs in March and April. Adults emerge from April to August. In the laboratory, growth is temperature dependent until the penultimate (Y) instar and this could be a factor in the field since, although larvae can exist year-round at a constant 26 °C, some larvae live in the cooler areas at the edges of the streams and pools. Entry to the final instar appears to require the long photoperiods that follow the vernal equinox.

THE BIOLOGY OF THE MEADOW NEMATODE PRATYLENCHUS PRATENSIS (DE MAN) FILIPJEV 1936

1939 ◽  
Vol 17d (2) ◽  
pp. 39-44 ◽  
Author(s):  
R. J. Hastings
Keyword(s):  
Life Cycle ◽  
Adult Male ◽  
Larval Stage ◽  
Second Generation ◽  
Hot Water ◽  
Root Tissue ◽  
Single Female ◽  
Male And Female ◽  
Larval Stages ◽  
De Man

The meadow nematode completes its life cycle in 54 to 65 days—25 to 31 days from the larval stage to the adult, and 29 to 34 days from maturation to the second generation. Eggs are deposited by a single female at the rate of not more than one a day. The largest number of eggs laid by a single female in one place was sixteen, owing apparently to migratory habits. The total number of eggs from a single female could not be determined.The adult male and female and all larval stages of this species are capable of entering the roots of oats. They are very susceptible to desiccation. No living nematodes were recovered from invaded root tissue that was allowed to dry. In moist excised oat roots, the nematodes remained viable for more than 30 days, but in water the majority died within the same period. A ten-minute immersion of infested oat roots in hot water will destroy the meadow nematode only when the temperature is 120° F., or higher.

HEAD CAPSULE MEASUREMENTS OF THE LARCH SAWFLY, PRISTIPHORA ERICHSONII (HYMENOPTERA: TENTHREDINIDAE) IN KOUCHIBOUGUAC NATIONAL PARK, NEW BRUNSWICK

1980 ◽  
Vol 112 (1) ◽  
pp. 111-112 ◽  
Author(s):  
Patrick Maltais
Keyword(s):  
New Brunswick ◽  
Prince Edward Island ◽  
National Park ◽  
Developmental Stages ◽  
Head Capsule ◽  
Larix Laricina ◽  
Maritime Provinces ◽  
Eastern Canada ◽  
Pristiphora Erichsonii ◽  
Larch Sawfly

The larch sawfly, Pristiphora erichsonii (Htg.), is a serious defoliator of trees of the genus Larix and particularly of Larix laricina (Du Roi) K. Koch in eastern Canada. According to Reeks (1954), four outbreaks occurred in the Maritime Provinces between 1883 and 1942. Following the last outbreak, few specimens of the insect were found in New Brunswick, Nova Scotia, and Prince Edward Island until 1960 when an outbreak started near Fredericton, New Brunswick. Since, outbreaks varying in degree from moderate to severe have persisted throughout this province.In the course of a study on the ecology and population dynamics of the insect it was found necessary to verify and separate the various developmental stages of the larvae.

LIFE CYCLE OF LAMBDINA ATHASARIA (WALKER) (LEPIDOPTERA: GEOMETRIDAE) DEVELOPING ON HEMLOCK IN CONNECTICUT

1996 ◽  
Vol 128 (6) ◽  
pp. 995-1003 ◽  
Author(s):  
Chris T. Maier ◽  
Carol R. Lemmon
Keyword(s):  
Life Cycle ◽  
Larval Development ◽  
Head Capsule ◽  
Tsuga Canadensis ◽  
Eastern Hemlock ◽  
Flight Period ◽  
Congeneric Species ◽  
Old Growth ◽  
Larval Size ◽  
Head Capsule Width

AbstractDuring 1992 and 1993, we studied the life cycle of Lambdina athasaria (Walker) developing on eastern hemlock, Tsuga canadensis (L.) Carrière, in Connecticut. The geometrid was univoltine, overwintering as a pupa. Adults emerged during 4 weeks in May and June after hemlock budbreak. Males emerged significantly earlier than females, and both sexes emerged earlier in 1993 than in 1992. Males flew for 4–5 weeks annually. Based on measurements of head capsule width, larvae had five or six instars, which fed from June to October. Early instars ate new growth, and older ones fed on old growth. Until mid-August, larval development was more advanced in 1993 than in 1992. Larvae descended from trees in September and October to pupate in the duff beneath trees. Lambdina athasaria can be distinguished from congeneric species that feed on conifers by its overwintering stage, flight period, larval size, and host.

scholarly journals Notes on the Life Cycle of the Tobacco Hornworm, Manduca sexta (L.) (Lepidoptera; Sphingidae), in Puerto Rico

1969 ◽  
Vol 59 (1) ◽  
pp. 51-62
Author(s):  
Rafael Inglés Casanova ◽  
Silverio Medina Gaud
Keyword(s):  
Puerto Rico ◽  
Life Cycle ◽  
Manduca Sexta ◽  
Natural Enemies ◽  
Host Plants ◽  
Larval Instar ◽  
Head Capsule ◽  
Tobacco Hornworm ◽  
Head Capsule Width ◽  
Leaf Consumption

The life cycle of the sphingid moth, Manduca sexta (L.), the tobacco hornworm, was investigated in Puerto Rico. Descriptions of the stages, including measurements of the egg (length and width), larva (length and head capsule width), pupa (length), and the duration of each of the stages are given. The estimated leaf consumption by each larval instar, a list of known host plants, and the natural enemies known to occur in Puerto Rico are included.

Life history and larval density of Cheumatopsyche digitata Mosely (Trichoptera: Hydropsychidae) in Opa Reservoir spillway, Ile-Ife, southwestern Nigeria

Zoosymposia ◽  
2011 ◽  
Vol 5 (1) ◽  
pp. 401-407
Author(s):  
SYLVESTER OGBOGU ◽  
WILLIAMS ADU
Keyword(s):  
Life History ◽  
Life Cycle ◽  
Larval Instar ◽  
Larval Density ◽  
Adult Emergence ◽  
Head Capsule ◽  
Southwestern Nigeria ◽  
Growth Ratio ◽  
Head Capsule Width ◽  
Site Density

The life history and density of Cheumatopsyche digitata Mosely (Trichoptera: Hydropsychidae) were examined below Opa Reservoir in Ile-Ife, southwestern Nigeria. This caddisfly is the only species that occurs immediately below the impoundment auxiliary spillway where it closely associates with an aquatic bryophyte, Fontinalis sp. We collected larvae every month between July 2004 and June 2005 as long as larvae were available in the study site. The instar growth ratio was fairly constant and ranged from 1.198 to 1.402 (mean ± standard error = 1.285 ± 0.073) but mean head capsule width increased with larval development. The frequency distribution of head capsule width of larvae clustered into 5 size classes, suggesting 5 larval instars for C. digitata in the study site. Density of larvae ranged from 1,100 to 11,150 inds.m-2 (mean ± SE = 6739  inds.m-2 ± 3904.70), the highest densities occurring in October 2004 during the bloom of Fontinalis. The first larval instar appeared in July 2004. Adult emergence occurred mainly in December 2004 through January 2005 at the onset of reservoir draw-down and death of Fontinalis. These patterns indicate that C. digitata tended to show a univoltine life cycle in the study site.

scholarly journals Life cycle of Diamondback moth, Plutella xylostella (L.) (Lepidoptera: Plutellidae), in Puerto Rico

1969 ◽  
Vol 70 (4) ◽  
pp. 229-234
Author(s):  
Carlos Rosario ◽  
Carlos Cruz
Keyword(s):  
Puerto Rico ◽  
Life Cycle ◽  
Body Length ◽  
Plutella Xylostella ◽  
Average Duration ◽  
Diamondback Moth ◽  
Head Capsule ◽  
Head Capsule Width ◽  
Larval Length

The life cycle of the diamondback moth, Plutella xylostella (L.), the worst pest of cabbage in Puerto Rico, was studied. Description of the stages, including measurements of the larva (body length and head capsule width), and duration of the stages are given. The average duration in days of the egg, larva, prepupa, pupa and adult was 3, 11.7 (4 instars), 1, 3.6 and 11.1, respectively. Larval length and head capsule width in mm for the 1st, 2nd, 3rd and 4th instar was 1.2, 2.1, 3.7, 7.0 and 0.15, 0.24, .40, 0.56, respectively.

The larva and pupa of Potamyia flavata (Banks 1934) (Trichoptera: Hydropsychidae): Description, life cycle, and notes on its biology

Zootaxa ◽  
2018 ◽  
Vol 4394 (3) ◽  
pp. 395
Author(s):  
WITWISITPONG MANEECHAN ◽  
PHASSAWAT KRUTTHA ◽  
TAENG ON PROMMI
Keyword(s):  
Content Analysis ◽  
Life Cycle ◽  
Green Algae ◽  
Head Capsule ◽  
Filamentous Algae ◽  
Gut Content Analysis ◽  
Gut Content ◽  
Head Capsule Width

The immature and adult stages of Potamyia flavata Banks 1934 were sampled in seven sampling sites in streams of western Thailand. The samples were collected in February, May, and December 2015 using hand picking. A total of 2,133 individuals of larvae were collected. The larva and pupa of Po. flavata are described and illustrated. Larvae have five instars. The head capsule width of the first to the fifth instar larvae were 0.20–0.29, 0.30–0.39, 0.40–0.59, 0.60–0.79, and 0.80–1.15 mm, respectively. Gut content analysis revealed that larvae are omnivorous filterers. The guts of the larvae contained mainly diatoms and green algae followed by filamentous algae, detritus, and arthropod fragments.       

scholarly journals Life cycle and control of the Asian lime swallowtail, Papilio demoleus (Lepidoptera: Papilionidae): A new invasive pest in Puerto Rico.

1969 ◽  
Vol 94 (1-2) ◽  
pp. 165-174
Author(s):  
Alejandro E. Segarra-Carmona ◽  
Irma Cabrera-Asencio ◽  
Luisa E. Flores-López ◽  
Luis Morales-Collado
Keyword(s):  
Puerto Rico ◽  
Life Cycle ◽  
Larval Instar ◽  
Pupal Stage ◽  
Head Capsule ◽  
Invasive Pest ◽  
Toxicity Tests ◽  
Local Conditions ◽  
Larval Stages ◽  
Papilio Demoleus

The arrival of the invasive Asian lime swallowtail, Papilio demoleus L., in Puerto Rico has prompted the need for a better understanding of its life cycle, and its control options under local citrus-producing conditions. Our results show that P. demoleus has a life cycle of approximately 30 days. From oviposition, eggs hatch in three days. Larval instar durations are 3, 2, 3, 3, and 5 d for larval stages 1 to 5, respectively. Pupal stage lasts approximately 12 days. Head capsule measurements for instars 1 to 4 are similar in males and females. Last instar females tend to be larger than males. Our data suggest that 12 or more generations are possible under local conditions. Acute stomach toxicity tests on third instar larvae indicate that spinosad and Bacillus thuringiensis subs, kurstaki cause 100% mortality in most concentrations tested. Other insecticides were not effective. Possible advantages of using these products are discussed in light of initiatives to use reduced risk pesticides and biologically-based pesticides.

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