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tetranychus urticae

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https://www.readbyqxmd.com/read/28649257/mati-a-novel-protein-involved-in-the-regulation-of-herbivore-associated-signaling-pathways
#1
M Estrella Santamaría, Manuel Martinez, Ana Arnaiz, Félix Ortego, Vojislava Grbic, Isabel Diaz
The defense response of the plants against herbivores relies on a complex network of interconnected signaling pathways. In this work, we characterized a new key player in the response of Arabidopsis against the two-spotted spider mite Tetranychus urticae, the MATI (Mite Attack Triggered Immunity) gene. This gene was differentially induced in resistant Bla-2 strain relative to susceptible Kon Arabidopsis accessions after mite attack, suggesting a potential role in the control of spider mites. To study the MATI gene function, it has been performed a deep molecular characterization of the gene combined with feeding bioassays using modified Arabidopsis lines and phytophagous arthropods...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28636085/herbivore-performance-and-plant-defense-after-sequential-attacks-by-inducing-and-suppressing-herbivores
#2
Elisa Faria de Oliveira, Angelo Pallini, Arne Janssen
It is well known that herbivore-induced plant defence alter host plant quality and can affect the behavior and performance of later arriving herbivores. Effects of sequential attacks by herbivores that either suppress or induce plant defenses are less well studied. We sequentially infested leaves of tomato plants with a strain of the phytophagous spider mite Tetranychus urticae that induces plant defenses and the closely related Tetranychus evansi, which suppresses plant defenses. Plant quality was quantified through oviposition of both spider mite species and by measuring proteinase inhibitor activity using plant material that had been sequentially attacked by both herbivore species...
June 21, 2017: Insect Science
https://www.readbyqxmd.com/read/28629883/laboratory-evaluation-of-the-effect-of-beauveria-bassiana-on-the-predatory-mite-phytoseiulus-persimilis-acari-phytoseiidae
#3
Mohammad Shaef Ullah, Un Taek Lim
Tetranychus urticae Koch (Acari: Tetranychidae), a major pest of many agricultural crops, is mainly controlled with chemical acaricides. However, predatory mites and entomopathogens have been proposed as alternative control agents. In this study, the effect of the BotaniGard(®) GHA strain of Beauveria bassiana on the survival, longevity, fecundity, and egg hatch rate of the predatory mite Phytoseiulus persimilis Athias-Henriot (Acari: Phytoseiidae) were studied under laboratory conditions. When B. bassiana was applied directly to P...
June 16, 2017: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/28621748/identification-of-onosma-visianii-roots-extract-and-purified-shikonin-derivatives-as-potential-acaricidal-agents-against-tetranychus-urticae
#4
Stefania Sut, Roman Pavela, Vladislav Kolarčik, Loredana Cappellacci, Riccardo Petrelli, Filippo Maggi, Stefano Dall'Acqua, Giovanni Benelli
There is an increasing need for the discovery of reliable and eco-friendly pesticides and natural plant-derived products may play a crucial role as source of new active compounds. In this research, a lipophilic extract of Onosma visianii roots extract containing 12% of shikonin derivatives demonstrated significant toxicity and inhibition of oviposition against Tetranychus urticae mites. Extensive chromatographic separation allowed the isolation of 11 naphthoquinone derivatives that were identified by spectral techniques and were tested against Tetranychus urticae...
June 16, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28620988/when-do-predatory-mites-phytoseiidae-attack-understanding-their-diel-and-seasonal-predation-patterns
#5
Consuelo Pérez-Sayas, Ernestina Aguilar-Fenollosa, Mónica A Hurtado, Josep A Jaques, Tatiana Pina
Predatory mites of the Phytoseiidae family are considered one of the most important groups of natural enemies used in biological control. The behavioral patterns of arthropods can differ greatly daily and seasonally; however, there is a lack of literature related to Phytoseiidae diel and seasonal predation patterns. The predatory activity of three phytoseiid species (two Tetranychidae-specialists, Phytoseiulus persimilis and Neoseiulus californicus, and one omnivore, Euseius stipulatus) that occur naturally in Spanish citrus orchards was observed under laboratory conditions in winter and summer...
June 16, 2017: Insect Science
https://www.readbyqxmd.com/read/28613863/structural-characterization-of-a-eukaryotic-cyanase-from-tetranychus-urticae
#6
Caleb R Schlachter, Vincent Klapper, Nicky Wybouw, Taylor Radford, Thomas Van Leeuwen, Miodrag Grbic, Maksymilian Chruszcz
The two-spotted spider mite Tetranychus urticae is a polyphagous agricultural pest and poses a high risk to global crop production as it is rapidly developing pesticide resistance. Genomic and transcriptomic analysis has revealed the presence of a remarkable cyanase gene in T. urticae and related mite species within the Acariformes lineage. Cyanase catalyzes the detoxification of cyanate and is potentially an attractive protein target for the development of new acaricides. Phylogenetic analysis indicates that within the Acariformes, the cyanase gene originates from a single horizontal gene transfer event, preceding subsequent speciation...
June 14, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28601087/gene-silencing-by-rna-interference-in-sarcoptes-scabiei-a-molecular-tool-to-identify-novel-therapeutic-targets
#7
Deepani D Fernando, Edward J Marr, Martha Zakrzewski, Simone L Reynolds, Stewart T G Burgess, Katja Fischer
BACKGROUND: Scabies is one of the most common and widespread parasitic skin infections globally, affecting a large range of mammals including humans, yet the molecular biology of Sarcoptes scabiei is astonishingly understudied. Research has been hampered primarily due to the difficulty of sampling or culturing these obligatory parasitic mites. A further and major impediment to identify and functionally analyse potential therapeutic targets from the recently emerging molecular databases is the lack of appropriate molecular tools...
June 10, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28592670/tetranychus-urticae-mites-do-not-mount-an-induced-immune-response-against-bacteria
#8
Gonçalo Santos-Matos, Nicky Wybouw, Nelson E Martins, Flore Zélé, Maria Riga, Alexandre B Leitão, John Vontas, Miodrag Grbić, Thomas Van Leeuwen, Sara Magalhães, Élio Sucena
The genome of the spider mite Tetranychus urticae, a herbivore, is missing important elements of the canonical Drosophila immune pathways necessary to fight bacterial infections. However, it is not known whether spider mites can mount an immune response and survive bacterial infection. In other chelicerates, bacterial infection elicits a response mediated by immune effectors leading to the survival of infected organisms. In T. urticae, infection by either Escherichia coli or Bacillus megaterium did not elicit a response as assessed through genome-wide transcriptomic analysis...
June 14, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28576654/mutations-on-m3-helix-of-plutella-xylostella-glutamate-gated-chloride-channel-confer-unequal-resistance-to-abamectin-by-two-different-mechanisms
#9
Xingliang Wang, Alin M Puinean, Andrias O O Reilly, Martin S Williamson, Charles L C Smelt, Neil S Millar, Yidong Wu
Abamectin is one of the most widely used avermectins for agricultural pests control, but the emergence of resistance around the world is proving a major threat to its sustained application. Abamectin acts by directly activating glutamate-gated chloride channels (GluCls) and modulating other Cys-loop ion channels. To date, three mutations occurring in the transmembrane domain of arthropod GluCls are associated with target-site resistance to abamectin: A309V in Plutella xylostella GluCl (PxGluCl), G323D in Tetranychus urticae GluCl1 (TuGluCl1) and G326E in TuGluCl3...
May 31, 2017: Insect Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28575300/the-effects-of-salinity-on-the-herbivorous-crop-pest-tetranychus-urticae-trombidiformes-tetranychidae-on-soybean-and-corn
#10
Jaclyn L Eichele-Nelson, Abbey F Wick, Thomas M DeSutter, Jason P Harmon
Many environmental factors, including soil characteristics, are critical for plants, herbivorous arthropods, and their interactions. Despite increasing evidence that soil salinity drastically impacts plants, little is known about how salinity affects the herbivorous arthropod pests feeding on those plants. We investigated how soil salinity affects the twospotted spider mite (Tetranychus urticae Koch) feeding on corn (Zea mays L.) and soybean (Glycine max L.). We performed two greenhouse studies, one focusing on the impact of salinity on individual mite fecundity over a period of 3 d and the other focusing on population growth of T...
June 1, 2017: Environmental Entomology
https://www.readbyqxmd.com/read/28569426/structure-and-expression-of-sulfatase-and-sulfatase-modifying-factor-genes-in-the-diamondback-moth-plutella-xylostella-l
#11
Xiao-Li Ma, Wei-Yi He, Wei Chen, Xue-Jiao Xu, Wei-Ping Qi, Ming-Min Zou, Yan-Chun You, Simon W Baxter, Ping Wang, Min-Sheng You
The diamondback moth, Plutella xylostella (L.), uses sulfatases (SULF) to counteract the glucosinolate-myrosinase defensive system that cruciferous plants have evolved to deter insect feeding. Sulfatase activity is regulated by post-translational modification of a cysteine residue by sulfatase modifying factor 1 (SUMF1). We identified 12 SULF genes (PxylSulfs) and two SUMF1 genes (PxylSumf1s) in the P. xylostella genome. Phylogenetic analysis of SULFs and SUMFs from P. xylostella, Bombyx mori, Manduca sexta, Heliconius melpomene, Danaus plexippus, Drosophila melanogaster, Tetranychus urticae and Homo sapiens showed that the SULFs were clustered into five groups, and the SUMFs could be divided into two groups...
June 1, 2017: Insect Science
https://www.readbyqxmd.com/read/28556282/interspecific-competition-counteracts-negative-effects-of-dispersal-on-adaptation-of-an-arthropod-herbivore-to-a-new-host
#12
Adriana Alzate, Karen Bisschop, Rampal S Etienne, Dries Bonte
Dispersal and competition have both been suggested to drive variation in adaptability to a new environment, either positively or negatively. A simultaneous experimental test of both mechanisms is however lacking. Here, we experimentally investigate how population dynamics and local adaptation to a new host plant in a model species, the two-spotted spider mite (Tetranychus urticae), is affected by dispersal from a stock population (no-adapted) and competition with an already adapted spider mite species (Tetranychus evansi)...
May 28, 2017: Journal of Evolutionary Biology
https://www.readbyqxmd.com/read/28518067/remote-sensing-evaluation-of-two-spotted-spider-mite-damage-on-greenhouse-cotton
#13
Daniel E Martin, Mohamed A Latheef
The objective of this study was to evaluate a ground-based multispectral optical sensor as a remote sensing tool to assess foliar damage caused by the two-spotted spider mite (TSSM), Tetranychus urticae Koch, on greenhouse grown cotton. TSSM is a polyphagous pest which occurs on a variety of field and horticultural crops. It often becomes an early season pest of cotton in damaging proportions as opposed to being a late season innocuous pest in the mid-southern United States. Evaluation of acaricides is important for maintaining the efficacy of and preventing resistance to the currently available arsenal of chemicals and newly developed control agents...
April 28, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28464967/mechanisms-of-resistance-to-three-mite-growth-inhibitors-of-tetranychus-urticae-in-hops
#14
A W Adesanya, M A Morales, D B Walsh, L C Lavine, M D Lavine, F Zhu
Mite growth inhibitors (MGIs), such as etoxazole and hexythiazox, are valuable IPM tools for Tetranychus urticae control in hops due to their unique mode of action and selectivity. Hence, it is necessary to standardize bioassay methods to evaluate the efficacy of MGIs, monitor resistance, and identify mechanisms underlying MGI resistance in the field. Here, we developed a three-tiered approach for evaluating ovicidal toxicity of MGIs to T. urticae, which simulated different MGI exposure scenarios in the field...
May 3, 2017: Bulletin of Entomological Research
https://www.readbyqxmd.com/read/28453174/selection-of-strawberry-cultivars-with-tolerance-to-tetranychus-urticae-acari-tetranychidae-and-high-yield-under-different-managements
#15
A F Costa, P E Teodoro, L L Bhering, M J Fornazier, J S Andrade, D S Martins, J S Zanuncio Junior
Tetranychus urticae Koch (Acari: Tetranychidae) is considered the main pest of strawberry. Several factors can favor its development, among them the genotype susceptibility and cropping system. The aims of this study were to evaluate the agronomic performance of strawberry cultivars under different managements and to identify strawberry cultivars that meet tolerance to T. urticae and high fruit yield. Thirteen cultivars of strawberry ('Albion', 'Aleluia', 'Aromas', 'Camarosa', 'Camino Real', 'Campinas', 'Diamante', 'Dover', 'Festival', 'Seascape', 'Toyonoka', 'Tudla', and 'Ventana') under three managements (open field, low tunnel, and high tunnel) were evaluated...
April 28, 2017: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/28432470/male-behavioural-plasticity-depends-on-maternal-mating-status-in-the-two-spotted-spider-mite
#16
Keiko Oku, Tom P G van den Beuken
In haplodiploid organisms including the two-spotted spider mite, Tetranychus urticae (Acari: Tetranychidae), both unmated and mated females can produce male offspring. A previous study reported that males produced by unmated females (UM males) find pre-reproductive females more quickly than males produced by mated females (M males) in T. urticae. However, it remains unclear what factors cause the difference. We investigated effects of maternal mating status on mate-searching behaviour of their sons by changing the sons' developmental environment...
April 2017: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/28405840/increased-activities-of-peroxidase-and-polyphenol-oxidase-enhance-cassava-resistance-to-tetranychus-urticae
#17
Xiao Liang, Qing Chen, Hui Lu, Chunling Wu, Fuping Lu, Jihong Tang
In order to study the function of peroxidase (POD) and polyphenol oxidase (PPO) in cassava resistance to spider mites, we tested the changes of transcription levels and activities of these two protective enzymes in both cassava and Tetranychus urticae (=T. cinnabarinus) during the interaction. The results showed that after damage of the mite-susceptible cassava cultivar BRA900 by T. urticae for 1 and 8 days, the transcription levels of MePOD and MePPO and the activities of POD and PPO showed no significant difference compared with those in undamaged leaves...
April 12, 2017: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/28405838/acaricidal-and-sublethal-effects-of-a-chenopodium-based-biopesticide-on-the-two-spotted-spider-mite-acari-tetranychidae
#18
Asma Musa, Irena Međo, Ivana Marić, Dejan Marčić
Acaricidal and sublethal effects of the biopesticide Requiem(®)EC (containing an essential oil extract of Chenopodium ambrosioides near ambrosioides) on the two-spotted spider mite, Tetranychus urticae Koch, were evaluated in laboratory bioassays. The biopesticide was applied to bean leaves or leaf discs using a Potter spray tower. Acaricidal activity against eggs and immatures was evaluated in successive acute toxicity bioassays. Concentration-mortality data were subjected to probit analysis and the following LC50 values (ml/l) were calculated: 2...
April 12, 2017: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/28386959/overcompensation-of-herbivore-reproduction-through-hyper-suppression-of-plant-defenses-in-response-to-competition
#19
Bernardus C J Schimmel, Livia M S Ataide, Rachid Chafi, Carlos A Villarroel, Juan M Alba, Robert C Schuurink, Merijn R Kant
Spider mites are destructive arthropod pests on many crops. The generalist herbivorous mite Tetranychus urticae induces defenses in tomato (Solanum lycopersicum) and this constrains its fitness. By contrast, the Solanaceae-specialist Tetranychus evansi maintains a high reproductive performance by suppressing tomato defenses. Tetranychus evansi outcompetes T. urticae when infesting the same plant, but it is unknown whether this is facilitated by the defenses of the plant. We assessed the extent to which a secondary infestation by a competitor affects local plant defense responses (phytohormones and defense genes), mite gene expression and mite performance...
June 2017: New Phytologist
https://www.readbyqxmd.com/read/28374515/transfer-of-cry1ac-and-cry2a-proteins-from-genetically-engineered-bt-cotton-to-herbivores-and-predators
#20
Michael Meissle, Jörg Romeis
With the cultivation of Bt cotton, the produced insecticidal Cry proteins are ingested by herbivores and potentially transferred along the food chain to natural enemies, such as predators. In laboratory experiments with Bollgard II cotton, concentrations of Cry1Ac and Cry2Ab were measured in Lepidoptera larvae (Spodoptera littoralis, Heliothis virescens), plant bugs (Euschistus heros), aphids (Aphis gossypii), whiteflies (Bemisia tabaci), thrips (Thrips tabaci, Frankliniella occidentalis), and spider mites (Tetranychus urticae)...
April 4, 2017: Insect Science
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