scholarly journals Investigations of Thrips tabaci and Aeolothrips intermedius population dynamics in tobacco plantations

2018 ◽  
pp. 121-127
Author(s):  
Szilvia Orosz ◽  
László Bujdos ◽  
Lajos Varga ◽  
Tibor Fekete
Keyword(s):  
Population Dynamics ◽  
Primary Objective ◽  
Thrips Tabaci ◽  
Onion Thrips ◽  
Sticky Traps ◽  
Chemical Treatments ◽  
Proper Timing ◽  
Yellow Sticky Traps

Studies were conducted between 2015 and 2017 with yellow sticky traps in seven tobacco plantations. The purpose was to determine when and in what numbers onion thrips individuals can settle into tobacco plantations. The primary objective of the study was to determine the proper timing of chemical treatments, furthermore, the determination of crucial factors that can influence the population dynamics of Thrips tabaci.

scholarly journals Dinâmica Populacional de Mosca-Branca, Incidência do Mosaico Dourado do Feijoeiro e Alternativas de Controle da Praga no "Cultivo das Secas" no Cerrado

2016 ◽  
Vol 9 (1) ◽  
pp. 18-25
Author(s):  
Luciana Claudia Toscano ◽  
Washington Marques Aguirre ◽  
Germison Vital Tomquelski ◽  
Wilson Itamar Maruyama ◽  
Geraldo Candido Cabral Gouveia ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Beauveria Bassiana ◽  
Flowering Stage ◽  
Sticky Traps ◽  
Experimental Area ◽  
Significant Difference ◽  
Bean Crop ◽  
Yellow Sticky Traps

Resumo. Os objetivos desta pesquisa foram estudar a dinâmica populacional de mosca-branca e do mosaico dourado do feijoeiro desde o plantio até o florescimento da cultura; verificar eficiência de inseticidas químico e microbiano no controle da mosca-branca; e analisar alguns parâmetros fitotécnicos na cultura do feijoeiro “da seca” após o controle da praga. O ensaio foi desenvolvido na área experimental da UEMS/Cassilândia - MS, em (DBC), com quatro repetições e oito tratamentos, sendo: 1) testemunha, 2) thiametoxan (50g i.a ha-1), 3) acetamiprid (60g i.a ha-1), 4) piryproxyfen (100g i.a ha-1), 5) spiromesifen (96g i.a ha-1), 6) imidacloprid (160g i.a ha-1), 7) metamidofós (300g i.a ha-1) e, 8) Beauveria bassiana (Bals.-Criv.) Vuill. (25 X 10 11 conídios ha-1). Contou-se número de ovos e ninfas em 25 folíolos por parcela e os adultos foram capturados e contados utilizando armadilhas adesivas amarelas (prévia), e continuamente nas testemunhas. As avaliações foram realizadas aos sete e 14 dias após as aplicações (DAA), e semanalmente até 51 (DAE) na testemunha. A ocorrência de ovos, ninfas e adultos de mosca-branca iniciaram-se aos 30 dias após a emergência (DAE), reduzindo aos 51 DAE, na fase de florescimento da cultura. Para o número de ovos aos sete DAA não houve diferença significativa entre os tratamentos, sendo que aos 14 DAA todos os tratamentos diferiram da testemunha exceto o tratamento B. bassiana. Para ninfas, aos sete e 14 DAA, piryproxifen apresentou melhor controle novamente. Aos sete DAA verificou-se que piryproxyfen apresentou menor média no número de adultos em relação à testemunha.Population Dynamics Whitefly, Golden Mosaic Effect of Feijoeiro and Pest Alternatives Control in “Drought Cultivation” in the CerradoAbstract. The objectives of this research were to study the population dynamics of whitefly and golden bean mosaic from planting to flowering of culture; check the efficiency of chemical and microbial insecticides to control the whitefly; and analyze some phytotechnical parameters in the bean crop “dry” after controlling the pest. The test was developed in the experimental area of the UEMS / Cassilândia - MS in (DBC), with four replications and eight treatments: 1) control, 2) thiamethoxan (50g ai ha-1), 3) acetamiprid (60g ai ha-1), 4) piryproxyfen (100g ai ha-1), 5) spiromesifen (96g ai ha-1), 6) imidacloprid (160g ai ha-1), 7) methamidophos (300g ai ha-1) and 8 ) Beauveria bassiana (Bals.-Criv.) Vuill. (25 X 10 11 conidia ha-1). Counted the number of eggs and nymphs in 25 leaflets per plot and adults were captured and counted using yellow sticky traps (prior), and continuously in the witnesses. The evaluations were performed at seven and 14 days after application (DAA), and weekly until 51 (DAE) in the control. The occurrence of eggs, nymphs and adult whitefly started up at 30 days after emergence (DAE), reducing to 51 DAE, the culture of flowering stage. For the number of eggs at seven DAA no significant difference between treatments, and at 14 DAA all treatments differed from the control except treatment B. bassiana. For nymphs, at seven and 14 DAA, piryproxifen showed better control again. At seven DAA it was found that piryproxyfen had lower average in the number of adults compared to the control.

Influence of temperature and rainfall on the population dynamics of Glycaspis brimblecombei and Psyllaephagus bliteus in Eucalyptus camaldulensis plantations

2018 ◽  
Vol 43 (1) ◽  
pp. 1 ◽  
Author(s):  
Pedro José Ferreira-Filho ◽  
Carlos Frederico Wilcken ◽  
Marcus Vinicius Masson ◽  
Wagner De Souza Tavares ◽  
Julio César Guerreiro ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Eucalyptus Camaldulensis ◽  
Sao Paulo ◽  
Effect Of Temperature ◽  
Sticky Traps ◽  
Influence Of Temperature ◽  
Paulo State ◽  
Glycaspis Brimblecombei ◽  
São Paulo State ◽  
Yellow Sticky Traps

The work analyzes the effect of temperature and rainfall on the population dynamics of Glycaspis brimblecombei (Hemiptera: Aphalaridae) and its parasitoid Psyllaephagus bliteus (Hymenoptera: Encyrtidae) in a Eucalyptus camaldulensis (Myrtaceae) plantation in São Paulo State, Brazil. During the study 53 yellow sticky traps were installedand 53 branches were collected from a 19 ha plot of E. camaldulensis plantation per evaluation. A total of 42 evaluations was made from January 2006 to 2008. The number of adults of G. brimblecombei and P. bliteus caught in the yellow sticky traps as well as the immature and mummies of the parasitized psyllids on E. camaldulensis leaves varied with seasons. The population also varies according to the season, with a peak in the winter and decreases in the summer when temperature and rainfall increase. The G. bramble combei and P. bliteus populations were inversely correlated with temperature and rainfall. These results are discussed as potential limitations to the establishment of the pest and its parasitoid.

scholarly journals Insects’ RNA Profiling Reveals Absence of “Hidden Break” in 28S Ribosomal RNA Molecule of Onion Thrips,Thrips tabaci

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Rosaline Wanjiru Macharia ◽  
Fidelis Levi Ombura ◽  
Erick Onyango Aroko
Keyword(s):  
Ribosomal Rna ◽  
Thrips Tabaci ◽  
28S Rrna ◽  
Onion Thrips ◽  
Rna Integrity ◽  
Rna Profiling ◽  
Insect Order ◽  
Banding Profile ◽  
Rrna Sequences

With an exception of aphids, insects’ 28S rRNA is thought to harbor a “hidden break” which cleaves under denaturing conditions to comigrate with 18S rRNA band to exhibit a degraded appearance on native agarose gels. The degraded appearance confounds determination of RNA integrity in laboratories that rely on gel electrophoresis. To provide guidelines for RNA profiles, RNA from five major insect orders, namely, Diptera, Hemiptera, Thysanoptera, Hymenoptera, and Lepidoptera, was compared under denaturing and nondenaturing conditions. This study confirmed that although present in most of insect’s RNA, the “hidden break” is absent in the 28S rRNA of onion thrips,Thrips tabaci. On the other hand, presence of “hidden break” was depicted in whiteflies’ 28S rRNA despite their evolutionary grouping under same order with aphids. Divergence of 28S rRNA sequences confirms variation of both size and composition of gap region among insect species. However, phylogeny reconstruction does not support speciation as a possible source of the hidden break in insect’s 28S rRNA. In conclusion, we show that RNA from a given insect order does not conform to a particular banding profile and therefore this approach cannot be reliably used to characterize newly discovered species.

Determination of beginning of bulb enlargement time in shallot, Allium cepa var aggregatum for managing onion thrips ( Thrips tabaci )

2017 ◽  
Vol 220 ◽  
pp. 154-159 ◽  
Author(s):  
Tebkew Damte ◽  
Getachew Tabor ◽  
Mesfin Haile ◽  
Geteneh Mitiku ◽  
Tewodros Lulseged
Keyword(s):  
Allium Cepa ◽  
Thrips Tabaci ◽  
Onion Thrips

Eliminating Thrips in Microshoot Cultures

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 506d-506
Author(s):  
Robert R. Tripepi ◽  
Holly J. Schwager ◽  
Mary W. George ◽  
Joseph P. McCaffrey
Keyword(s):  
Betula Pendula ◽  
Culture Media ◽  
Dry Weight ◽  
Thrips Tabaci ◽  
Shoot Cultures ◽  
Onion Thrips ◽  
Ulmus Americana ◽  
Shoot Height ◽  
Tissue Culture Media ◽  
Plant Tissue Cultures

Two insecticides, acephate or azadirachtin, were added to tissue culture media to determine their effectiveness in controlling onion thrips (Thrips tabaci Lindeman.) and to determine if these insecticides could damage the plant shoot cultures. To test for insecticide phytotoxicity, microshoots from European birch (Betula pendula), American elm (Ulmus americana), `Pink Arola' chrysanthemum (Dendranthema grandiflora), `America' rhododendron (Rhododendron catawbiense), `Golden Emblem' rose (Rosa hybrida), and `Gala' apple (Malus domestica) were placed in 130-ml baby food jars containing 25 ml of medium supplemented with 6.5, 13, or 26 mg/l Orthene® (contained acephate) or 0.55, 1.1, or 2.2 ml/l Azatin® (contained azadirachtin). Control jars lacked insecticide. To test for thrips control, 13 mg/l Orthene® or 0.55 ml/l Azatin® was added to Murashige and Skoog medium, and 10 thrips were placed on `Gala' apple microshoots in each jar. Jars were sealed with plastic wrap. In both studies, microshoot dry weight and heights were determined. In the second study, the total number of thrips per jar was also determined 3 weeks after inoculation. Microshoots on Orthene®-treated media lacked phytotoxicity symptoms, regardless of the concentration used. In contrast, Azatin® hindered plant growth, decreasing shoot height or dry weight by up to 85% depending on the species. Both insecticides prevented thrips populations from increasing, since less than 10 thrips were found in jars with insecticide-treated medium. Control jars, however, contained an average of almost 70 thrips per jar. This study demonstrated that both Orthene® and Azatin® were effective for eradicating thrips from plant tissue cultures, but Orthene® should probably be used because Azatin® was phytotoxic to all species tested.

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