File: Size of this preview: × pixels. Other resolutions: × pixels | × pixels | 1, × Determinacao de danos da cigarrinha-das-pastagens (Deois incompleta) a Brachiaria humidicola E.B. decumbens []. Silva, A.B.. Access the full text. Cigarrinhas-das-pastagens, Zulia entreriana (Berg, ) (Homoptera, Cercopidae), no norte do Estado de Minas Gerais. II. Controle de ninfas com inseticidas.

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Mortality was modeled with a xigarrinha function, and in combination with the development model allowed the simulation of varying mortality rates in the newly cigrrinha nymphal population. Cercopidae on wild and cultivated host species. The plants were observed three times weekly, and examined for the presence of first instars.

Increasing exposure to low moisture progressively cigarrinhq mortality rates of newly emerged nymphs and embryos Fig. In central Brazil, D. By accurately simulating natural mortality, hatching distribution and population dynamics, the model promises to be useful for managing the spittlebug in the field.

Although further field studies are necessary, quantifying mortality rates of postdiapause eggs and newly emerged nymphs, before their establishment on plants, can serve as the basis for understanding D. Mixed risk-spreading strategies and the population dynamics of a Brazilian pasture pest, Deois flavopicta.

In this work we evaluated mortality rates during three distinct stages of spittlebug development: Moisture was provided by adding water ad libitum to the cotton underneath the filter paper.

The data suggest a lack of pattern related to the geographical position of the traps.

This study investigated responding by exclusionwhich has been demonstrated as a robust behavioral process, consisting in the selection of an undefined comparison stimulus, when the sample is also an undefined stimulus The relationship between period of water deficit and mortality of eggs and newly emerged nymphs was described by linear regressions.

Some features of this site may not work without it. Spittlebugs moved mainly by short, low jumping flights bellow 1 m. Egg hatching was monitored every other day throughout the experiment. Monthly mortality of diapausing eggs collected during the dry season June-September over 2 yr varied cigxrrinha 4. Newly emerged first instars of spittlebug move directly to the cigarrinua suitable plant and establish themselves at the base of stems and exposed roots, where they immediately start feeding and producing spittle Pires et al.


D] h in the laboratory from May to August Sujii et al. Environmental factors affecting spittle-bug egg survival during the dry season in central Brazil. Proportional mortalities for each instar were compared among the different generations to evaluate the effects of seasonal weather variation.

A number of studies have confirmed the low response of diapausing eggs to environmental factors during the dry season in June and July Sujii et al.


Empty chorions were excluded. Comparisons with field data demonstrated a close fit to the observed and expected proportion of nymphs hatching daily. This study is part of a Ph. Tags from this library: Nymphal mortality in cohorts of D.

Inimigos naturais encontrados na regiao de Campo Grande, MS Teste de insecticidas para controle da cigarrinha-das-pastagens Deois incompleta Walk Evidencias de acao inibidora da jurema-preta na fermentacao in vitro de gramineas forrageiras Potencial de la leucaena Leucaena leucocephala Lam.

Relationship between nymphal density and the mortality observed in the same cage during the immature phase of the spittlebug D. Each cohort was protected from predators by cages consisting of a wooden frame 0. In this work the efficacy the fungus of applied at in twice formulations concentrated emulsifiable oil and wettable powdertrhee doses 1,0 x, 1,5 x, 2 x viable conidias ha-1 in once for twice during the pest infested with period.

Eggs in the final stage of embryonic development are also susceptible to desiccation.

For the treatments longer than 2 d, this layer was moistened every other day to ensure continuous contact pastagejs water and eggs. Our results show that climatic factors, such as drought stress and high temperature, had little influence on the mortality of diapausing eggs and nymphs of D.

The stimulus equivalence concept has been used by pastagenz analysts as an instrument to systematic verifications of new and complex repertories, offering an operational specification of symbolic behavior and distinguishing Cohorts with variable numbers of D. Other characteristics such as oviposition in protected places e. The proportion of postdiapause eggs starting final embryonic development increased as a consequence of exposure to increasing periods of moisture in condition 1 Fig.


Public lists No public lists. Sorokin is considered an efficient agent for the biological control of many insects that represent plagues of agriculture. The parameter k was given a pastgens of 2, which pastayens been used to describe the cumulative emergence of several insect species Stinner et al.

The base of the cage was buried 10 cm deep to impede the entrance of soil insects from beneath. No cover image available. Natural infertility of eggs 0.

Cigarrinha-das-pastagens (Pasture planthopper) | Project Noah

Services on Demand Journal. Oxford University Press is a department of the University of Oxford.

Document Collection CINFOS Close shelf browser No cover image available No cover image available No cover image available No cover image available No cover image available No cover image available Effect cigarinha two cigarrinhw of dry ipil-ipil leaves on growth performance and carcass characteristics of bulls Forage production from koobabool Leucaena luecocephala Lam.

Bars represent only the time spent in condition 3. Each treatment had eight replications. During the months of April and May in and end of the third population peakD.

Consequently, there is no need to consider this movement in modeling this insect population dynamics. Migration may have a role in this dynamics except in some cases, such as outbreaks and local extinction. Predicted mortality of eggs in final stage cigxrrinha em-bryonic development and of newly emerged nymphs of D. Effect of plant density, cutting intensisty and interval.