THE WITHIN FIELD SPATIAL PATTERN OF THE LARVAL EGYPTIAN ALFALFA WEEVIL, HYPERA BRUNNEIPENNIS (COLEOPTERA: CURCULIONIDAE): AN APPLICATION OF PARAMETER ESTIMATES IN SIMULATION

1977 ◽  
Vol 109 (12) ◽  
pp. 1599-1604 ◽  
Author(s):  
Jerrel B. Christensen ◽  
Andrew P. Gutierrez ◽  
Warren R. Cothran ◽  
Charles G. Summers
Keyword(s):  
Spatial Distribution ◽  
Decision Rules ◽  
Parameter Estimates ◽  
Alfalfa Weevil ◽  
Leaf Consumption ◽  
Alfalfa Field ◽  
Dispersion Patterns ◽  
Consumption Rates ◽  
Competition For Food ◽  
Hypera Brunneipennis

AbstractThe spatial distribution of the Egyptian alfalfa weevil larvae using Iwao’s index of dispersion was examined in a California alfalfa field. The changing dispersion patterns with time were found to be influenced by both density induced competition for food and varying spatial distribution of host plants. values characteristic for both years quickly stabilized. This made possible a method for estimating leaf consumption rates by larval populations with an aggregated distribution, k being derived from . Field sampling decision rules were also determined.

scholarly journals Management of the Egyptian alfalfa weevil, Hypera brunneipennis (Boheman) (Coleoptera: Curculionidae), in the alfalfa, Medicago sativa L., using the entomopathogenic fungus, Beauveria bassiana (Balsamo) Vuillemin

2019 ◽  
Vol 29 (1) ◽  
Author(s):  
Monir M. M. El Husseini
Keyword(s):  
Medicago Sativa ◽  
Beauveria Bassiana ◽  
Entomopathogenic Fungus ◽  
Larval Population ◽  
Alfalfa Weevil ◽  
Alfalfa Field ◽  
Medicago Sativa L ◽  
Hypera Brunneipennis ◽  
Fungus Beauveria Bassiana ◽  
Sweep Net

AbstractLarval and adult populations of the Egyptian alfalfa weevil (EAW) Hypera brunneipennis (Boheman) (Coleoptera: Curculionidae) was monitored after application of the entomopathogenic fungus Beauveria bassiana in the alfalfa field (Medicago sativa L.) in two successive seasons 2014/2015 and 2015/2016. The second and last generation of the weevil on April 10, 2016, was controlled by only one application with the conidiospores of the entomopathogenic fungus B. bassiana (3 × 108 spores/ml). Accordingly, the larval population decreased from 16.07 ± 1.09 in season 2015/2016 to 7.37 ± 0.05 individuals/50 sweep net double strokes in season 2016/2017. Also, the adult weevil’s population decreased from 5.66 ± 0.8 to 2.55 ± 0.6 individuals/50 sweep net double strokes in the two seasons, respectively. 39.66% mortality rate was recorded in the Hypera brunneipennis adults aestivated under loose bark of the surrounding eucalyptus trees, which received the application of B. bassiana in the field. Another application with the fungus, targeting the second generation of the pest adults in alfalfa each season, will undoubtedly lead to a further decrease in the pest population.

Spatial distribution and fluctuating populations of predatory mites (Mesostigmata: Phytoseiidae), phytophagous mites (Acari: Eriophyidae, Tetranychidae) and their relationships with wild chili pepper phenological stages in two Natural Protected Areas of Mexico

2022 ◽  
Author(s):  
José Irving Monjarás-barrera ◽  
Mario Rocandio-rodríguez ◽  
Cristina Domínguez-castro ◽  
Francisco Reyes-zepeda ◽  
Sandra Grisell Mora-ravelo ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Protected Areas ◽  
Distribution Pattern ◽  
Mite Species ◽  
Chili Pepper ◽  
Phenological Stages ◽  
Natural Protected Areas ◽  
Settlement Development ◽  
Phytophagous Mites ◽  
Dispersion Patterns

Ecological interactions between mites (predatory and phytophagous) and wild plants growing in undisturbed environments play a crucial role to understand their natural settlement, development and dispersion patterns. Pequin chili pepper, Capsicum annuum L. var. glabriusculum, is a low-cost natural resource for local communities living inside Natural Protected Areas (ANP) of Tamaulipas State in Mexico. The aims of this research work were: 1) determine the spatial distribution pattern of predatory and phytophagous mites, 2) determine the spatiotemporal association between predatory and phytophagous mites, and 3) determine the association among different mite species and some phenological stages of Pequin chili pepper. The most abundant phytophagous mites were Tetranychus merganser and Aculops lycpoersici, and the predatory species were Amblyseius similoides, Euseius mesembrinus and Metaseiulus (Metaseiulus) negundinis. Most mite species showed an aggregated distribution pattern according to the plant phenological stages. However, the distribution of mite species throughout time showed different types of aggregation. On the other hand, we found positive associations among A. lycopersici and T. merganser phytophagous mites with A. similoides, E. mesembrinus and M. (M.) negundinis predators mites. The association between plants and mite species were influenced by the phenological stages of Pequin chili pepper. This is an indication of the complexity among trophic-chain interactions that depend largely on the available resources and competition. These two factors serve as foundations for settlement, development and dispersion patterns of certain species.

Spatial distribution of Antarctic shrimps (Crustacea: Decapoda) by underwater photography

1991 ◽  
Vol 3 (4) ◽  
pp. 363-369 ◽  
Author(s):  
Julian Gutt ◽  
M. Gorny ◽  
W. Arntz
Keyword(s):  
Spatial Distribution ◽  
Continental Shelf ◽  
Weddell Sea ◽  
Small Scale ◽  
Frequency Distributions ◽  
South Eastern ◽  
Direct Observations ◽  
Underwater Photography ◽  
Dispersion Patterns ◽  
Eastern Weddell Sea

Three species of shrimps (Notocrangon antarcticus, Chorismus antarcticus, Nematocarcinus lanceopes) were investigated in the south-eastern Weddell Sea using of underwater photography. Maximum densities of c. 100 specimens per 100 m2 were found for N. antarcticus on the continental shelf (200–600 m) and for N. lanceopes on the slope (800–1200 m). Small-scale dispersion patterns and size-frequency distributions were analyzed within dense concentrations. These direct observations indicate that the behaviour of the three species is adapted to different habitats with Chorismus distribution correlated with that of sponges and Notocrangon with base sediment.

scholarly journals Spatial distribution and sampling of Corythucha ciliata (Hemiptera: Tingidae) in London plane trees

2019 ◽  
Vol 24 (1) ◽  
pp. 43-52
Author(s):  
He-Ping Wei ◽  
Feng Wang ◽  
Rui-Ting Ju
Keyword(s):  
Spatial Distribution ◽  
Distribution Pattern ◽  
Power Law ◽  
Distribution Data ◽  
Taylor’S Power Law ◽  
Control Threshold ◽  
Dispersion Patterns ◽  
Plane Trees ◽  
Taylor's Power Law ◽  
London Plane

Taylor’s power law and Iwao’s patchiness regression were used to describe the dispersion patterns for overwintering and wandering stages of Corythucha ciliata on the London plane trees, Platanus x acerifolia (Ait.) Willd. Both Taylor’s and Iwao’s tests fit the distribution data for the overwintering stage. The overwintering adults were spatially aggregated. In the wandering stage, Taylor’s power law consistently fit the data, whereas the fit of Iwao’s patchiness regression was erratic. Both Iwao’s and Taylor’s indices indicated a clumped distribution pattern for eggs, nymphs, and wandering adults. Trunk was identified as the best sampling target for the overwintering stage whereas twig was the best for the wandering stage. In order to determine the sample size for evaluating whether the population has reached the control threshold, the sampling of 35 and 7 trunks for the overwintering stage and 32 and 8 twigs per tree for the wandering stage would provide 0.5- and 0.25-precision levels, respectively.

Host plants of the home invading nuisance pest, Mupli beetle, Luprops tristis (Fabricius, 1801) (Coleoptera: Tenebrionidae) in agribelts of South India

ENTOMON ◽  
2020 ◽  
Vol 45 (1) ◽  
pp. 31-42
Author(s):  
Aswathi P ◽  
Sabu Thomas K
Keyword(s):  
Host Plants ◽  
South India ◽  
Leaf Age ◽  
Feeding Preference ◽  
Feeding Rates ◽  
Senescent Leaf ◽  
Age Related ◽  
Leaf Consumption ◽  
Consumption Rates ◽  
Tender Leaf

Presence of home invading nuisance pest Luprops tristis (Fabricius, 1801) in nonrubber belts and its generalist feeding behavior lead to assessment of its feeding preference on the leaves of common litter contributing plants in agribelts in south India. Bioassays with leaves of 17 plants namely, cashew, cassia, cocoa, flowering murdah golden flame tree, Indian-beech, Indian kino, jackfruit, macaranga, mahogany, mango, mexican lilac, raintree, rubber, tamarind, teak and wild jack were carried out. General bias towards tender leaves of most plants was distinct. Based on Leaf age related variation in feeding rates, host plant were categorised as tender leaf preferred, both tender and senescent leaves preferred and senescent leaf preferred. Based on leaf consumption rates, host plants were broadly categorized as most preferred, moderately preferred, low preferred and least preferred, and its implications are discussed. Aggressive feeding on leaves of many plants abundant in non-rubber agriculture belts necessitates their monitoring in the litter stands of the cited plants in non-rubber belts for preventing its establishment as uncontrollable nuisance pest across south India.

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