scholarly journals Efficiency of Three Predators, Geoeoris bullatus, 1 Nabis americoferus , 2 and Coccinella transversoguttata , 3 Used Alone or in Combination Against Three Insect Prey Species, Myzus persicae, 4 Ceramica picta , 5 and Mamestra configurata , 5 in a Greenhouse Study 6

1972 ◽  
Vol 1 (2) ◽  
pp. 258-263 ◽  
Author(s):  
George Tamaki ◽  
R. E. Weeks
Keyword(s):  
Myzus Persicae ◽  
Prey Species ◽  
Mamestra Configurata ◽  
Insect Prey ◽  
Greenhouse Study ◽  
Coccinella Transversoguttata

scholarly journals Comparison of Capsicum annuum and C. pubescens for Antixenosis as a Means of Aphid Resistance

HortScience ◽  
1996 ◽  
Vol 31 (6) ◽  
pp. 1017-1018 ◽  
Author(s):  
Paul W. Bosland ◽  
John J. Ellington
Keyword(s):  
Capsicum Annuum ◽  
Myzus Persicae ◽  
Choice Experiment ◽  
Green Peach Aphid ◽  
Aphid Resistance ◽  
Choice Test ◽  
Susceptible Host ◽  
Greenhouse Study ◽  
Reproductive Rates ◽  
Plant Choice

Accessions of Capsicum annuum L., a susceptible host, and C. pubescens (R. & P.), a resistant host, were grown in a replicated greenhouse study to test whether antixenosis (nonpreference), antibiosis, or both was the mechanism for resistance to green peach aphid [Myzus persicae (Sulzer)]. A plant choice experiment established that aphids preferred C. annuum to C. pubescens. A no-plant choice test was not undertaken; nevertheless, the aphid's reproductive rates were measured in leaf containment cages and were similar on both hosts. The mechanism of antibiosis was not indicated because fecundity was not reduced in the containment cages; however, other measures of antibiosis were not studied. These observations suggest that antixenosis may be functioning in C. pubescens.

Green peach aphid and potato leafroll virus: transmission and control

2020 ◽  
Author(s):  
R.A. Bagrov ◽  
◽  
V.I. Leunov
Keyword(s):  
Myzus Persicae ◽  
Green Peach Aphid ◽  
Virus Transmission ◽  
Potato Leafroll Virus ◽  
Factors Affecting ◽  
Potato Viruses ◽  
Tuber Necrosis ◽  
Aphid Vectors ◽  
Leafroll Virus ◽  
And Control

The mechanisms of transmission of potato viruses from plants to aphid vectors and from aphids to uninfected plants are described, including the example of the green peach aphid (Myzus persicae, GPA). Factors affecting the spreading of tuber necrosis and its manifestation on plants infected with potato leafroll virus (PLRV) are discussed. Recommendations for PLRV and GPA control in the field are given.

Динамика численности и видовой состав тлей на посадках семенного картофеля в Ленинградской области

2020 ◽  
pp. 3-7
Author(s):  
Тамара Алексеевна Шелабина ◽  
Марина Николаевна Берим
Keyword(s):  
Myzus Persicae ◽  
Aphis Fabae ◽  
Aphis Nasturtii

Существенным элементом в комплексе специальных и агротехнических приемов, направленных на ограничение распространения вирусной инфекции, является мониторинг численности, динамики и видового состава тлей, мигрирующих в посадках оригинального картофеля. Двухлетний мониторинг (2016 – 2017 гг.) на опытных полях Гатчинского района Ленинградской области проведен с использованием желтых водных ловушек Мёрике. Изучены количество тлей, сроки их миграции на посадки картофеля, сроки наступления пика численности. Наибольшее влияние на насекомых оказывала среднесуточная температура воздуха. За сезон наблюдений отловлено: в 2016 г. — 481 крылатая особь 31 вида, в 2017 г. — 131 особь 30 видов. Доля возможных переносчиков вирусов картофеля от общего числа зарегистрированных крылатых тлей составила в 2016 г. 14,8 %, в 2017 г. — 32,8 %. Оценка скрытой зараженности вирусной инфекцией (MBK, YBK вирусы) методом ИФА в 2015 – 2017 гг. показала, что на растениях картофеля сорта Ломоносовский скрытая зараженность составила 2,6 – 7,3 %, сорта Чародей — 1,9 – 13,3 %, сорта Невский — 0,8 – 10,5 %, сорта Романо — 4,1 – 9 %. Из известных переносчиков вирусов картофеля в оба года в энтомологических сборах с сосудов отмечены Aphis nasturtii — 6 – 12,2 %, Aphis fabae — 7,2 – 4,6 % от общего числа отловленных; Myzus persicae (13 %) в составе мигрирующей генерации тлей отмечены только в дождливом и прохладном 2017 г. В прогностических целях желательно пользоваться в регионе также данными со всасывающей ловушки, поскольку появление в ней насекомых отмечено на 10 – 12 дней раньше, чем на полях.

PATTERNS OF GASTROPOD MOLLUSK PREDATION ON BIVALVE MOLLUSKS ALONG THE UPPER TEXAS GULF COAST

2018 ◽  
Vol 70 (1) ◽  
Author(s):  
Serena J. Randolph ◽  
Alan D. Maccarone
Keyword(s):  
Shell Thickness ◽  
Prey Species ◽  
Gulf Coast ◽  
Prey Selection ◽  
Drill Hole ◽  
The United States ◽  
Hole Diameter ◽  
Bivalve Mollusks ◽  
Collection Site ◽  
Drill Holes

Abstract Predation on bivalve mollusks by gastropod mollusks is common in coastal regions of the United States; however, few previous studies have examined whether drilling gastropods exhibit prey selection. In 2016, shells with small holes drilled by as many as two gastropod predators were collected at three sites separated by 30 km along the Texas Upper Gulf Coast on the Bolivar Peninsula (29° 40′N, 94° 90′W). The likeliest predators in these waters are the southern oyster drill (Stramonita haemastoma Linnaeus 1767) and the moon snail (Neverita duplicate Say 1822). Collected shells were identified to species and measurements were taken to examine statistical relationships between predators and prey species. These measurements included drill-hole diameter, shell thickness, drill-hole completeness, number of drill attempts, and collection site. Across the three locations, 17 different species of shells with drill holes were collected; of these, we focused on the ten most abundant species (n = 277 shells). The sample showed high variation in drill-hole diameter, shell thickness, and drill-hole completeness. Both the total number of holes and mean drill-hole diameter differed significantly among prey species (ANOVA, both P < 0.0001). In addition, drill-hole diameter correlated directly with prey shell thickness (P < 0.0001). Shells whose drill holes were complete were significantly thinner than shells with incomplete holes (P < 0.0001). Mean prey shell thickness, mean drill-hole diameter, and mean number of drill holes all differed significantly by collection site (all P < 0.0001). Ecological and morphological implications related to gastropod predation on mollusks are discussed.

Diet

2017 ◽  
Author(s):  
M.G.L. Mills ◽  
M.E.J. Mills
Keyword(s):  
Prey Species ◽  
Radio Tracking ◽  
Relative Occurrence ◽  
Important Prey ◽  
Individual Prey ◽  
Sibling Groups

Four methods were used to document the diet of cheetahs: incidental observations, radio tracking, tracking, spoor, and continuous follows. A combination of continuous follows and tracking spoor gave the best results. Steenbok were the most frequently killed species, but they did not dominate the diet in the same way as Thomson’s gazelle do in the Serengeti. Coalition males have a different diet profile from single males, single females, females with cubs, and sibling groups. For all but single males, the relative occurrence of prey species in the diet reflected its dietary importance in terms of kilograms of meat obtained. Gemsbok calves and adult ostrich were important prey for coalition males and springhares were important for single males. Three individual prey specializations for females were found; namely springbok specialists, steenbok/duiker specialists, and intermediates. Contrary to an earlier study, springbok were not found to be the most important prey species.

The population dynamics of bite-sized predators: prey dependence, territoriality, and mobility

2018 ◽  
Author(s):  
Xavier Lambin
Keyword(s):  
Prey Species ◽  
Top Down ◽  
Predator Prey ◽  
Biological Barrier ◽  
Reciprocal Interactions ◽  
Demographic Rates ◽  
Risk Of Predation ◽  
Increased Risk ◽  
Rodent Prey ◽  
Small Mustelids

The dependency of mustelid demographic rates on prey abundance has the potential to cause a strong coupling between predator-prey populations. Data on mustelid dynamics show that such strong reciprocal interactions only materialise in some restricted conditions. Bite-size mustelid predators searching for scarce, depleted prey expose themselves to increased risk of predation by larger predators of small mammal that are themselves searching for similar prey species. As voles or muskrats become scarcer, weasels and mink searching for prey over larger areas become increasingly exposed to intra-guild predation, unless they operate in a habitat refuge such as the sub-nivean space. Where larger predators are sufficiently abundant or exert year-round predation pressure on small mustelids, their impact on mustelids may impose biological barrier to dispersal that are sufficient to weaken the coupling between small mustelids and their rodent prey, and thus impose a degree of top down limitation on mustelids.

Trophic Cascades in Grasslands

2018 ◽  
Author(s):  
Brian J. Wilsey
Keyword(s):  
Indirect Effects ◽  
Prey Species ◽  
Trophic Levels ◽  
Herbaceous Plant ◽  
Direct Effects ◽  
Temperate Grasslands ◽  
Cascading Effect ◽  
Top Predators ◽  
Invertebrate Predators ◽  
Ecology Of Fear

Top predators have effects that can ‘cascade down’ on lower trophic levels. Because of this cascading effect, it matters how many trophic levels are present. Predators are either ‘sit and wait’ or ‘active’. Wolves are top predators in temperate grasslands and can alter species composition of smaller-sized predators, prey, and woody and herbaceous plant species, either through direct effects or indirect effects (‘Ecology of Fear’). In human derived grasslands, invertebrate predators fill a similar ecological role as wolves. Migrating populations of herbivores tend to be more limited by food than non-migratory populations. The phenology and synchrony of births vary among prey species in a way that is consistent with an adaptation to predation. Precocious species have highly synchronous birth dates to satiate predators. Non-precocious species (‘hiders’) have asynchronous births. Results from studies that manipulate both predators and food support the hypothesis that bottom-up and top-down effects interact.

Sign in / Sign up

Export Citation Format

Share Document