Results 271 to 280 of about 13,071,015 (306)
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Estimation of the Parameters of a Survival Process with Downward Jumps in Life Table
Mathematical Population Studies, 2005ABSTRACT Parameters for the birth and death diffusion life table model subject to downward jumps randomly occurring at a constant rate are estimated. The jump magnitudes have a beta distribution with support [0, lx ], where lx is the total number of survivors prior to the jump. The estimation method is maximum likelihood. The Cramer–Rao Lower bound and
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Life table parameters of Indonesian tortoise beetles under laboratory conditions
1994Life history traits such as adult longevity, fecundity and duration of immature stages have been studied under laboratory conditions in several cassidine species (Albuquerque & Becker, 1986; Habib & Vasconcellos-Neto, 1979; Kosior, 1975; Ward & Pienkowski, 1978).
Koji Nakamura +2 more
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The Effects of Clofentezine on Life-table Parameters in Two-spotted Spider Mite Tetranychus urticae
Experimental & Applied Acarology, 2003Sublethal effects of the growth inhibitor, clofentezine, on life-table parameters of Tetranychus urticae Koch females treated at different developmental stages with a concentration causing >90% mortality were investigated. Females which survived treatment as 'early' (0-24 h old) eggs produced 12% more offspring than the untreated females during the ...
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Journal of Economic Entomology, 2017
The khapra beetle, Trogoderma granarium Everts (Coleoptera: Dermestidae), is a polyphagous pest that infests many stored grains and products. The effect of nine maize hybrids including 704, AR 89, AS 71, AS 77, BC 678, KSC 703, PL 472, SC 704, and Simax was studied on biology and life table parameters of T. granarium at controlled conditions (33 ± 1 °C,
S, Majd-Marani +3 more
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The khapra beetle, Trogoderma granarium Everts (Coleoptera: Dermestidae), is a polyphagous pest that infests many stored grains and products. The effect of nine maize hybrids including 704, AR 89, AS 71, AS 77, BC 678, KSC 703, PL 472, SC 704, and Simax was studied on biology and life table parameters of T. granarium at controlled conditions (33 ± 1 °C,
S, Majd-Marani +3 more
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Life Tables and Parasitism: Estimating Parameters in Joint Host-Parasitoid Systems
1989Estimating total losses from parasitism is a basic step in constructing life tables for host-parasitoid systems. Such estimates are not available in most cases directly from stage-frequency data or samples of percentage parasitism, particularly when recruitment or parasitism overlaps with advancement to the next developmental stage.
T. S. Bellows +2 more
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Environmental Entomology, 2014
Age-specific life table parameters, survivorship, and extra molting of the beet armyworm, Spodoptera exigua (Hübner), were determined at eight constant temperatures of 12, 15, 20, 25, 30, 33, 34, and 36°C with a variation of 0.5°C on sugar beet leaves. No development was observed at 12 and 36°C. The survivorship of overall immature stages was higher at
Azadeh, Karimi-Malati +3 more
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Age-specific life table parameters, survivorship, and extra molting of the beet armyworm, Spodoptera exigua (Hübner), were determined at eight constant temperatures of 12, 15, 20, 25, 30, 33, 34, and 36°C with a variation of 0.5°C on sugar beet leaves. No development was observed at 12 and 36°C. The survivorship of overall immature stages was higher at
Azadeh, Karimi-Malati +3 more
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Life table parameters of Spodoptera eridania under different temperatures and diets
Peer ReviewThis study aimed to evaluate the effects of biotic and abiotic factors, such as diet and temperature, on the population growth of Spodoptera eridania (Cramer) (Lepidoptera: Noctuidae) using fertility life table parameters. Life tables were constructed based on survival, oviposition, and sex ratio data.
Dirceu Pratissoli +4 more
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Experimental and Applied Acarology, 2007
The astigmatid mite Tyrophagus neiswanderi Johnston and Bruce is mainly considered a pest of ornamental and horticultural crops. However, this mite has been found infesting Cabrales cheese in Spain, though its population density is low compared to Acarus farris, the prevalent species of astigmatid mite encountered in Cabrales cheese maturing caves. One
Ismael, Sánchez-Ramos +2 more
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The astigmatid mite Tyrophagus neiswanderi Johnston and Bruce is mainly considered a pest of ornamental and horticultural crops. However, this mite has been found infesting Cabrales cheese in Spain, though its population density is low compared to Acarus farris, the prevalent species of astigmatid mite encountered in Cabrales cheese maturing caves. One
Ismael, Sánchez-Ramos +2 more
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From Cohort Data to Life Table Parameters Via Stochastic Modeling
1989We develop a new method through which parameters such as the duration of stages and the mortality rates within them can be deduced from data on abundance of the stages over time in one cohort of individuals. This method involves modeling of the development process, modeling of the sampling process with its inherent errors, a statistical approach based ...
Moshe Braner, Nelson G. Hairston
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Journal of Economic Entomology, 2010
The aphid Chaitophorus leucomelas Koch (Hemiptera: Aphididae) is one of the most important pests of poplar (Populus spp.) plantations in Iran. In this study, development, reproduction, and life history of the aphid were assessed on 11 poplar clones; belong to three species, Populus nigra L., Populus deltoides Bartram ex Marshall, and Populus ...
M Pahlavan, Yali +3 more
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The aphid Chaitophorus leucomelas Koch (Hemiptera: Aphididae) is one of the most important pests of poplar (Populus spp.) plantations in Iran. In this study, development, reproduction, and life history of the aphid were assessed on 11 poplar clones; belong to three species, Populus nigra L., Populus deltoides Bartram ex Marshall, and Populus ...
M Pahlavan, Yali +3 more
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