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two spotted spider mite

Yasumasa Murata, Masahiro Osakabe
Ambient ultraviolet-B (UVB) radiation induces lethal effects in the two-spotted spider mite Tetranychus urticae, whereas photoreactivation by irradiation with ultraviolet-A and visible light (VIS) plays an important role to increase survival of mites irradiated by UVB. The physiological mechanisms and ecological significance of photoreactivation in terrestrial arthropods have not been shown clearly. We verified the biological impact and accumulation of DNA lesions by UVB irradiation and the repair of them by photoreactivation in T...
November 21, 2016: Experimental & Applied Acarology
Shengyong Wu, Haicui Xie, Maoye Li, Xuenong Xu, Zhongren Lei
No abstract text is available yet for this article.
November 9, 2016: Experimental & Applied Acarology
Phuong Cao Thi Ngoc, Robert Greenhalgh, Wannes Dermauw, Stephane Rombauts, Sabina Bajda, Vladimir Zhurov, Miodrag Grbić, Yves Van de Peer, Thomas Van Leeuwen, Pierre Rouzé, Richard M Clark
While mechanisms to detoxify plant produced, anti-herbivore compounds have been associated with plant host use by herbivores, less is known about the role of chemosensory perception in their life histories. This is especially true for generalists, including chelicerate herbivores that evolved herbivory independently from the more studied insect lineages. To shed light on chemosensory perception in a generalist herbivore, we characterized the chemosensory receptors (CRs) of the chelicerate two-spotted spider mite, Tetranychus urticae, an extreme generalist...
October 26, 2016: Genome Biology and Evolution
Miguel G Ximénez-Embún, Pedro Castañera, Félix Ortego
The performance of the two-spotted spider mite, Tetranychus urticae Koch, on plants depends on the rate of adaptation of mite populations to each particular host and can be influenced by environmental conditions. We have tested the effects of drought stress, caused by water deficiency, in the interaction of tomato plants with tomato adapted (TA) and tomato non-adapted (TNA) strains of T. urticae. Our data revealed that mite performance was enhanced for the TA strain when reared on drought-stressed tomato plants, rising population growth and leaf damage...
October 24, 2016: Journal of Insect Physiology
Shengyong Wu, Haicui Xie, Maoye Li, Xuenong Xu, Zhongren Lei
Entomopathogenic fungi and predatory mites can independently contribute to suppressing the two-spotted spider mite, Tetranychus urticae Koch. It is important to assess the risk of possible fungal infections in predators when a combination of them are being considered as a tandem control strategy for suppressing T. urticae. The first part of this study tested 12 Beauveria bassiana isolates for virulence in T. urticae. Strains SCWJ-2, SDDZ-9, LNSZ-26, GZGY-1-3 and WLMQ-32 were found to be the most potent, causing 37...
October 25, 2016: Experimental & Applied Acarology
Katrien H P Van Petegem, David Renault, Robby Stoks, Dries Bonte
Despite an increasing number of studies documenting life-history evolution during range expansions or shifts, we lack a mechanistic understanding of the underlying physiological processes. In this explorative study, we used a metabolomics approach to study physiological changes associated with the recent range expansion of the two-spotted spider mite (Tetranychus urticae). Mite populations were sampled along a latitudinal gradient from range core to edge and reared under benign common garden conditions for two generations...
September 2016: Ecology and Evolution
Jingyu Lin, Dan Wang, Xinlu Chen, Tobias G Köllner, Mitra Mazarei, Hong Guo, Vincent R Pantalone, Prakash Arelli, Charles Neal Stewart, Ningning Wang, Feng Chen
Plant terpene synthase genes (TPSs) have roles in diverse biological processes. Here we report the functional characterization of one member of the soybean TPS gene family, which was designated GmAFS. Recombinant GmAFS produced in Escherichia coli catalyzed the formation of a sesquiterpene (E,E)-α-farnesene. GmAFS is closely related to (E,E)-α-farnesene synthase gene from apple, both phylogenetically and structurally. GmAFS was further investigated for its biological role in defense against nematodes and insects...
October 13, 2016: Plant Biotechnology Journal
Wim Jonckheere, Wannes Dermauw, Vladimir Zhurov, Nicky Wybouw, Jan Van den Bulcke, Carlos A Villarroel, Robert Greenhalgh, Mike Grbić, Rob C Schuurink, Luc Tirry, Geert Baggerman, Richard M Clark, Merijn R Kant, Bartel Vanholme, Gerben Menschaert, Thomas Van Leeuwen
The two-spotted spider mite Tetranychus urticae is an extremely polyphagous crop pest. Alongside an unparalleled detoxification potential for plant secondary metabolites, it has recently been shown that spider mites can attenuate or even suppress plant defenses. Salivary constituents, notably effectors, have been proposed to play an important role in manipulating plant defenses and might determine the outcome of plant-mite interactions. Here, the proteomic composition of saliva from T. urticae lines adapted to various host plants-bean, maize, soy, and tomato-was analyzed using a custom-developed feeding assay coupled with nano-LC tandem mass spectrometry...
December 2016: Molecular & Cellular Proteomics: MCP
Blas Agut, Jordi Gamir, Josep A Jaques, Victor Flors
Recent research suggests that systemic signalling and communication between roots and leaves plays an important role in plant defence against herbivores. In the present study, we show that the oviposition of the two-spotted spider mite Tetranychus urticae in the systemic leaves of citrus rootstock Citrus aurantium (sour orange) was reduced by 50% when a lower leaf was previously infested with conspecifics. Metabolomic and gene expression analysis of the root efflux revealed a strong accumulation of glutamic acid (Glu) that triggered the expression of the citrus putative glutamate receptor (GRL) in the shoots...
October 2016: Journal of Experimental Botany
Shoko Kawaguchi, Yuki Manabe, Tatsuya Sugawara, Masahiro Osakabe
Adult females of the two-spotted spider mite (Tetranychus urticae Koch) enter diapause under conditions of short-day length and low temperature. A conspicuous body color change, from greenish yellow to bright orange, accompanies diapause induction. This pigmentation is attributed to accumulation of keto-carotenoids produced internally from β-carotene, which is a precursor of vitamin A essential for inducing diapause. The quantity of β-carotene transferred from females to eggs has been considered sufficient to induce diapause...
September 25, 2016: Environmental Entomology
Ling Wang, Youjun Zhang, Wen Xie, Qingjun Wu, Shaoli Wang
The two-spotted spider mite Tetranychus urticae is a serious pest of many agricultural crops and ornamental plants. The sublethal effects of a new chemical, spinetoram, on T. urticae were investigated by treating adult females and eggs with LC10 and LC20 in the laboratory. The data were assessed based on age-stage, two-sex life table analysis. The results showed that T. urticae developmental time from egg to adult was reduced and that fecundity was increased by treatment with LC10 and LC20 of spinetoram. The LC10 and LC20 of spinetoram also increased the intrinsic and finite rate of increase and the net reproductive rate and reduced the mean generation time, egg duration, and larval duration whether eggs or adult females were treated...
September 2016: Pesticide Biochemistry and Physiology
Nicolas Bensoussan, M Estrella Santamaria, Vladimir Zhurov, Isabel Diaz, Miodrag Grbić, Vojislava Grbić
The two-spotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae), is one of the most polyphagous herbivores feeding on cell contents of over 1100 plant species including more than 150 crops. It is being established as a model for chelicerate herbivores with tools that enable tracking of reciprocal responses in plant-spider mite interactions. However, despite their important pest status and a growing understanding of the molecular basis of interactions with plant hosts, knowledge of the way mites interface with the plant while feeding and the plant damage directly inflicted by mites is lacking...
2016: Frontiers in Plant Science
Ruohan Liu, Teresia W Nyoike, Oscar E Liburd
Greenhouse and field experiments were conducted to evaluate the effectiveness of site-specific tactics for management of the twospotted spider mite, Tetranychus urticae Koch, a major pest of greenhouse and field-grown strawberries (Fragaria x ananassa Duchesne). Two site-specific (spot) treatments, the miticide bifenazate (Acramite(®)) and the predatory mite Neoseiulus californicus McGregor, were compared with whole-plot treatments of bifenazate or N. californicus to determine whether T. urticae could be effectively managed in field-grown strawberry using only site-specific tactics...
October 2016: Experimental & Applied Acarology
Shin G Goto
Photoperiodism is an adaptive, seasonal timing system that enables organisms to coordinate their development and physiology to annual changes in the environment using day length (photoperiod) as a cue. This review summarizes our knowledge of the physiological mechanisms underlying photoperiodism in spider mites. In particular, the two-spotted spider mite Tetranychus urticae is focussed, which has long been used as a model species for studying photoperiodism. Photoperiodism is established by several physiological modules, such as the photoreceptor, photoperiodic time measurement system, counter system, and endocrine effector...
July 16, 2016: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
Anna Dworak, Małgorzata Nykiel, Beata Walczak, Anna Miazek, Dagmara Szworst-Łupina, Barbara Zagdańska, Małgorzata Kiełkiewicz
In maize, leaf proteome responses evoked by soil drought applied separately differ from those evoked by mite feeding or both types of stresses occurring simultaneously. This study focuses on the involvement of proteomic changes in defence responses of a conventional maize cultivar (Bosman) to the two-spotted spider mite infestation, soil drought and both stresses coexisting for 6 days. Under watering cessation or mite feeding applied separately, the protein carbonylation was not directly linked to the antioxidant enzymes' activities...
October 2016: Planta
Tetsuo Kokubun, Alison Scott-Brown, Geoffrey C Kite, Monique S J Simmonds
Two new and seven known sesquiterpene compounds were isolated from an agar plate culture of Granulobasidium vellereum, isolated from a log of Ulmus sp. The two new structures were elucidated with spectroscopic methods as an illudalane derivative, granulolactone (1), and a 15-norilludane, granulodione (9). The acaricidal and insecticidal activities of the isolated compounds were examined in vitro against two major horticultural pests, the two-spotted spider mite Tetranychus urticae and the glasshouse thrips Heliothrips haemorrhoidalis, respectively...
June 24, 2016: Journal of Natural Products
Rafael Sorrentino Minazzi Stocco, Mário Eidi Sato, Taiana Lumi Santos
The two-spotted spider mite, Tetranychus urticae Koch, is one of the most important pests on a wide range of crops worldwide. Studies on stability of resistance and possible fitness costs associated with etoxazole resistance were carried out in T. urticae to provide basic information necessary to define effective acaricide resistance management strategies for this pest. Selection for resistance to etoxazole was performed in a population of T. urticae collected from a commercial rose field, in Holambra County, in the State of São Paulo, Brazil...
August 2016: Experimental & Applied Acarology
Okhee Choi, Jung-Joon Park, Jinwoo Kim
The two-spotted spider mite (TSSM) Tetranychus urticae is one of the most important pests of cucurbit plants. If TSSM can act as vector for Acidovorax citrulli (Acc), causal agent of bacterial fruit blotch (BFB), then the movement of mites from infected to healthy plants may represent a potential source of inocula for BFB outbreaks. To confirm the association between Acc and TSSM, we generated a green fluorescent protein-tagged mutant strain (Acc02rf) by transposon mutagenesis and demonstrated that TSSM can transmit Acc from infected to non-infected watermelon plants...
August 2016: Experimental & Applied Acarology
Ingeborg Klingen, Maren Pindsle Holthe, Karin Westrum, Aruppillai Suthaparan, Torfinn Torp
A controlled climatic chamber microcosm experiment was conducted to examine how light affects the hourly sporulation pattern of the beneficial mite pathogenic fungus Neozygites floridana during a 24h cyclus over a period of eight consecutive days. This was done by inoculating two-spotted spider mites (Tetranychus urticae) with N. floridana and placing them on strawberry plants for death and sporulation. Spore (primary conidia) discharge was observed by using a spore trap. Two light regimes were tested: Plant growth light of 150μmolm(-2)s(-1) for 12h supplied by high pressure sodium lamps (HPS), followed by either; (i) 4h of 50μmolm(-2)s(-1) light with similar HPS lamps followed by 8h darkness (full HPS light+reduced HPS light+darkness) or (ii) 4h of 50μmolm(-2)s(-1) red light followed by 8h darkness (full HPS light+red light+darkness)...
June 2016: Journal of Invertebrate Pathology
Mostafa Khanamani, Yaghoub Fathipour, Ali Asghar Talebi, Mohammad Mehrabadi
BACKGROUND: It has been shown that pollen as a dietary supplement may increase the establishment of generalist predatory mites, and therefore pest control by these mites can be provided. Life table studies were performed to evaluate the nutritional value of seven different pollens (almond, castor-bean, date-palm, maize, bitter-orange, sunflower and mixed bee pollen) as a supplementary food source for the spider mite predator, Neoseiulus californicus McGregor. In addition, the nutritional quality of each pollen species was assessed through morphological and chemical analysis...
April 27, 2016: Pest Management Science
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