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tetranychus urticae

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https://www.readbyqxmd.com/read/29678924/sirnas-and-pirnas-collaborate-for-transposon-control-in-the-two-spotted-spider-mite
#1
Mosharrof Mondal, Kody Mansfield, Alex Flynt
RNAi has revolutionized genetic research, and is being commercialized as an insect pest control technology. Mechanisms exploited for this purpose are antiviral and therefore rapidly evolving. Ideally, RNAi will also be used for non-insect pests, however, differences in RNAi biology makes this uncertain. Tetranychus urticae (two-spotted spider mite) is a destructive non-insect pest, which has a proclivity to develop pesticide resistance. Here we provide a comprehensive study of the endogenous RNAi pathways of spider mites to inform design of exogenous RNAi triggers...
April 20, 2018: RNA
https://www.readbyqxmd.com/read/29611070/pathogenic-differences-of-the-entomopathogenic-fungus-isaria-cateniannulata-to-the-spider-mite-tetranychus-urticae-trombidiformes-tetranychidae-and-its-predator-euseius-nicholsi-mesostigmata-phytoseiidae
#2
Xiao-Na Zhang, Jian-Jun Guo, Xiao Zou, Dao-Chao Jin
Isaria cateniannulata and Euseius nicholsi are two important biological control agents currently being used in many areas of China to control a variety of pests. In order to determine the possibility of a concomitant application with the two agents in a biocontrol program involving the two-spotted spider mite, Tetranychus urticae, we quantified the pathogenicity of a strain of I. cateniannulata (08XS-1) against females of both T. urticae and E. nicholsi. We observed the infection process using scanning electron microscopy and fluorescence microscopy to distinguish differences in fungal performance...
April 2, 2018: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/29608276/engineered-reciprocal-chromosome-translocations-drive-high-threshold-reversible-population-replacement-in-drosophila
#3
Anna Buchman, Tobin Ivy, John Marshall, Omar S Akbari, Bruce A Hay
Replacement of wild insect populations with transgene-bearing individuals unable to transmit disease or survive under specific environmental conditions using gene drive provides a self-perpetuating method of disease prevention. Mechanisms that require the gene drive element and linked cargo to exceed a high threshold frequency in order for spread to occur are attractive because they offer several points of control: they bring about local, but not global population replacement; and transgenes can be eliminated by reintroducing wildtypes into the population so as to drive the frequency of transgenes below the threshold frequency required for drive...
April 2, 2018: ACS Synthetic Biology
https://www.readbyqxmd.com/read/29600387/the-responses-of-cucumber-plants-subjected-to-different-salinity-or-fertilizer-concentrations-and-reproductive-success-of-tetranychus-urticae-mites-on-these-plants
#4
Samira Khodayari, Fatemeh Abedini, David Renault
The plant stress hypothesis posits that a herbivore's reproductive success increases when it feeds on stressed plants, while the plant vigor hypothesis predicts that a herbivore preferentially feeds on more vigorous plants. We examined these opposing hypotheses by growing spider mites (Tetranychus urticae) on the leaves of stressed and healthy (vigorous) cucumber plants. Host plants were grown under controlled conditions at low, moderate, and high concentrations of NaCl (to induce salinity stress), at low, moderate, and high fertilizer concentrations (to support growth), and without these additions (control)...
March 29, 2018: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/29594845/efficacy-of-carbon-dioxide-treatments-for-the-control-of-the-two-spotted-spider-mite-tetranychus-urticae-and-treatment-impact-on-plant-seedlings
#5
Ya-Jun Gong, Li-Jun Cao, Ze-Hua Wang, Xiao-Yi Zhou, Jin-Cui Chen, Ary Anthony Hoffmann, Shu-Jun Wei
To develop a new control method for the two-spotted spider mite (TSSM), Tetranychus urticae, we investigated the effect of controlled atmospheres of carbon dioxide (CO2 ) on TSSM mortality under different concentrations and treatment periods, and evaluated the impact of treatments on seedlings of five host plants of TSSM. Egg hatching rate of TSSM was reduced to 37.7, 5.4 or 0% after 24 h treatment involving concentrations of 16.7, 33.3 or 50%, respectively. Mobile stages (nymphs and adult) of TSSM were completely controlled after 24 h treatment at concentrations higher than 33...
March 28, 2018: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/29566459/enormous-expansion-of-the-chemosensory-gene-repertoire-in-the-omnivorous-german-cockroach-blattella-germanica
#6
Hugh M Robertson, Rachel L Baits, Kimberly K O Walden, Ayako Wada-Katsumata, Coby Schal
The acquisition of genome sequences from a wide range of insects and other arthropods has revealed a broad positive correlation between the complexity of their chemical ecology and the size of their chemosensory gene repertoire. The German cockroach Blattella germanica is an extreme omnivore and has the largest chemosensory gene repertoire known for an arthropod, exceeding even the highly polyphagous spider mite Tetranychus urticae. While the Odorant Receptor family is not particularly large, with 123 genes potentially encoding 134 receptors (105 intact), the Gustatory Receptor family is greatly expanded to 431 genes potentially encoding 545 receptors (483 intact), the largest known for insects and second only to the spider mite...
March 22, 2018: Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution
https://www.readbyqxmd.com/read/29524004/antixenosis-and-antibiosis-response-of-common-bean-phaseolus-vulgaris-to-two-spotted-spider-mite-tetranychus-urticae
#7
Marie Shoorooei, Abdul Hadi Hoseinzadeh, Reza Maali-Amiri, Hossein Allahyari, Masoud Torkzadeh-Mahani
The two-spotted spider mite, Tetranychus uticae Koch (Acari: Tetranychidae), is globally one of the most devastating pests that feed on numerous crops, including common bean (Phaseolus vulgaris L.). This study was aimed to evaluate the effects of genotype and morphological attributes of common bean on T. uticae. Forty common bean accessions were used to investigate antixenosis and antibiosis through assessing mite feeding preference and reproduction under laboratory conditions. Three resistant (i.e., 56, 63, 238) and two susceptible (i...
March 9, 2018: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/29520527/sublethal-effects-of-spirodiclofen-abamectin-and-pyridaben-on-life-history-traits-and-life-table-parameters-of-two-spotted-spider-mite-tetranychus-urticae-acari-tetranychidae
#8
Moosa Saber, Zeinab Ahmadi, Gholamreza Mahdavinia
Two-spotted spider mite, Tetranychus urticae Koch, is one of the economically most important pests on a wide range of crops in greenhouses and orchards worldwide. Control of T. urticae has been largely based on the use of acaricides. Sublethal effects of spirodiclofen, pyridaben and abamectin were studied on life-table parameters of T. urticae females treated with the acaricides. LC25 values of spirodiclofen, abamectin and pyridaben (3.84, 0.04 and 136.96 µg a.i./ml, respectively) were used for sublethal studies...
March 8, 2018: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/29516379/effect-of-temperature-on-development-and-reproduction-of-the-carmine-spider-mite-tetranychus-cinnabarinus-acari-tetranychiae-fed-on-cassava-leaves
#9
Zhiwen Zou, Jianfei Xi, Ge Liu, Shuxian Song, Tianrong Xin, Bin Xia
The effect of five constant temperatures (16, 20, 24, 28 and 32 °C) on the development, survival and reproduction of Tetranychus cinnabarinus (Boisduval) [= Tetranychus urticae Koch (red form)] fed on cassava leaves was examined in the laboratory at 85% relative humidity. Development time of various immature stages decreased with increasing temperature, with total egg-to-adult development time varying from 27.7 to 6.7 days. The lower thermal threshold for development was 10.8 °C and the thermal constant from egg to adult was 142...
March 7, 2018: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/29494488/overexpression-of-hvicy6-in-barley-enhances-resistance-against-tetranychus-urticae-and-entails-partial-transcriptomic-reprogramming
#10
M Estrella Santamaria, Mercedes Diaz-Mendoza, David Perez-Herguedas, Goetz Hensel, Jochen Kumlehn, Isabel Diaz, Manuel Martinez
Cystatins have been largely used for pest control against phytophagous species. However, cystatins have not been commonly overexpressed in its cognate plant species to test their pesticide capacity. Since the inhibitory role of barley HvCPI-6 cystatin against the phytophagous mite Tetranychus urticae has been previously demonstrated, the purpose of our study was to determine if barley transgenic lines overexpressing its own HvIcy6 gene were more resistant against this phytophagous infestation. Besides, a transcriptomic analysis was done to find differential expressed genes among wild-type and transformed barley plants...
March 1, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29490054/acaricide-mediated-competition-between-the-sibling-species-tetranychus-cinnabarinus-and-tetranychus-urticae
#11
Wencai Lu, Yuan Hu, Peng Wei, Qiang Xu, Christian Bowman, Ming Li, Lin He
The carmine spider mite (Tetranychus cinnabarinus [Acarifonnes: Tetranychidae]) and the two-spotted spider mite (Tetranychus urticae [Acarifonnes: Tetranychidae]) are two notorious pests of agricultural crops. Control of these pests has been dependent upon using different kinds of acaricides. The purpose of this study was to determine the differential responses of these two pest species collected from crops in the same field to acaricide treatments. Field trials have shown that without spraying acaricides, T...
February 27, 2018: Journal of Economic Entomology
https://www.readbyqxmd.com/read/29478090/species-and-density-dependent-induction-of-volatile-organic-compounds-by-three-mite-species-in-cassava-and-their-role-in-the-attraction-of-a-natural-enemy
#12
Delia M Pinto-Zevallos, Ranna H S Bezerra, Silvia R Souza, Bianca G Ambrogi
Upon damage by herbivores, plants induce an array of volatile organic compounds (VOCs) that mediate ecological interactions involving communication with organisms of the second and third trophic levels. VOC-mediated tritrophic interactions have largely been studied in various systems, including cassava (Manihot esculenta), but little is known about the chemical nature of herbivore-induced VOCs in this crop and the response they evoke in natural enemies. Several tetranychid and predatory mites are associated with cassava...
February 24, 2018: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/29466295/can-plant-defence-mechanisms-provide-new-approaches-for-the-sustainable-control-of-the-two-spotted-spider-mite-tetranychus-urticae
#13
REVIEW
Blas Agut, Victoria Pastor, Josep A Jaques, Victor Flors
Tetranychus urticae ( T. urticae ) Koch is a cosmopolitan, polyphagous mite which causes economic losses in both agricultural and ornamental plants. Some traits of T. urticae hamper its management, including a short life cycle, arrhenotokous parthenogenesis, its haplodiploid sex determination system, and its extraordinary ability to adapt to different hosts and environmental conditions. Currently, the use of chemical and biological control are the major control methods used against this mite. In recent years, some studies have focused on plant defence mechanisms against herbivores...
February 21, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29463413/a-genomic-approach-to-identify-and-monitor-a-novel-pyrethroid-resistance-mutation-in-the-redlegged-earth-mite-halotydeus-destructor
#14
Owain R Edwards, Thomas K Walsh, Suzanne Metcalfe, Wee Tek Tay, Ary A Hoffmann, Peter Mangano, Alan Lord, Svetlana Micic, Paul A Umina
Resistance mechanisms are typically uncovered by identifying sequence variation in known candidate genes, however this strategy can be problematic for species with no reference data in known relatives. Here we take a genomic approach to identify resistance to pyrethroids in the redlegged earth mite, Halotydeus destructor, a member of the Penthalidae family of mites that are virtually uncharacterized genetically. Based on shallow genome sequencing followed by a genome assembly, we first identified contigs of the H...
January 2018: Pesticide Biochemistry and Physiology
https://www.readbyqxmd.com/read/29456543/no-interactions-of-stacked-bt-maize-with-the-non-target-aphid-rhopalosiphum-padi-and-the-spider-mite-tetranychus-urticae
#15
Yinghua Shu, Jörg Romeis, Michael Meissle
In the agroecosystem, genetically engineered plants producing insecticidal Cry proteins from Bacillus thuringiensis (Bt) interact with non-target herbivores and other elements of the food web. Stacked Bt crops expose herbivores to multiple Cry proteins simultaneously. In this study, the direct interactions between SmartStax® Bt maize producing six different Cry proteins and two herbivores with different feeding modes were investigated. Feeding on leaves of Bt maize had no effects on development time, fecundity, or longevity of the aphid Rhopalosiphum padi (Hemiptera: Aphididae), and no effects on the egg hatching time, development time, sex ratio, fecundity, and survival of the spider mite Tetranychus urticae (Acari: Tetranychidae)...
2018: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29453965/effects-of-beauveria-bassiana-on-predation-and-behavior-of-the-predatory-mite-phytoseiulus-persimilis
#16
Shengyong Wu, Zhenlong Xing, Weinan Sun, Xuenong Xu, Ruixia Meng, Zhongren Lei
Determination of intraguild interactions between entomopathogens and predators is important when attempting to use a combination of these two natural enemy groups for biological control of their shared arthropod pest species. This study assessed the effects of Beauveria bassiana on the predation and associated behavior of the predatory mite, Phytoseiulus persimilis, against Tetranychus urticae. The functional response tests showed that P. persimilis exhibited a Holling type II response on the spider mite, Tetranychus urticae, when treated with either a B...
February 14, 2018: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/29435771/identification-of-spider-mite-species-and-their-endosymbionts-using-multiplex-pcr
#17
Flore Zélé, Mylène Weill, Sara Magalhães
Spider mites of the genus Tetranychidae are severe crop pests. In the Mediterranean a few species coexist, but they are difficult to identify based on morphological characters. Additionally, spider mites often harbour several species of endosymbiotic bacteria, which may affect the biology of their hosts. Here, we propose novel, cost-effective, multiplex diagnostic methods allowing a quick identification of spider-mite species as well as of the endosymbionts they carry. First, we developed, and successfully multiplexed in a single PCR, primers to identify Tetranychus urticae, T...
February 12, 2018: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/29423706/active-optical-sensor-assessment-of-spider-mite-damage-on-greenhouse-beans-and-cotton
#18
Daniel E Martin, Mohamed A Latheef
The two-spotted spider mite, Tetranychus urticae Koch, is an important pest of cotton in mid-southern USA and causes yield reduction and deprivation in fiber fitness. Cotton and pinto beans grown in the greenhouse were infested with spider mites at the three-leaf and trifoliate stages, respectively. Spider mite damage on cotton and bean canopies expressed as normalized difference vegetation index indicative of changes in plant health was measured for 27 consecutive days. Plant health decreased incrementally for cotton until day 21 when complete destruction occurred...
February 8, 2018: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/29411186/exploring-virulence-of-new-and-less-studied-species-of-metarhizium-spp-from-brazil-for-two-spotted-spider-mite-control
#19
Thiago Castro, Jørgen Eilenberg, Italo Delalibera
The two-spotted spider mite Tetranychus urticae is an important pest of strawberry crops in Brazil and many other countries. Focus for biocontrol studies involving entomopathogenic fungi has been on three species from the genus Metarhizium: M. anisopliae sensu stricto (s.s.), M. brunneum and M. robertsii. Also, the species Beauveria bassiana has been studied for spider mite control and one isolate (ESALQPL63) is commercially available in Brazil. New and undescribed Metarhizium species have been found recently in Brazil and provide a pool of isolates with potential for biocontrol in Brazil and probably also elsewhere...
February 6, 2018: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/29391538/chitosan-nanoparticles-functionalized-with-%C3%AE-cyclodextrin-a-promising-carrier-for-botanical-pesticides
#20
Estefânia V R Campos, Patrícia L F Proença, Jhones L Oliveira, Cirano C Melville, Jaqueline F Della Vechia, Daniel J de Andrade, Leonardo F Fraceto
Carvacrol and linalool are natural compounds extracted from plants and are known for their insecticidal and repellent activities, respectively. However, their low aqueous solubility, high photosensitivity, and high volatility restrict their application in the control of agricultural pests. The encapsulation of volatile compounds can be an effective way of overcoming such problems. Inclusion complexes between beta-cyclodextrin (β-CD) and carvacrol (CVC) or linalool (LNL) were investigated. Inclusion complexes were prepared by the kneading method...
February 1, 2018: Scientific Reports
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