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tetranychus urticae

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https://www.readbyqxmd.com/read/28432470/male-behavioural-plasticity-depends-on-maternal-mating-status-in-the-two-spotted-spider-mite
#1
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 21, 2017: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/28405840/increased-activities-of-peroxidase-and-polyphenol-oxidase-enhance-cassava-resistance-to-tetranychus-urticae
#2
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
#3
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
#4
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...
April 7, 2017: New Phytologist
https://www.readbyqxmd.com/read/28374515/transfer-of-cry1ac-and-cry2a-proteins-from-genetically-engineered-bt-cotton-to-herbivores-and-predators
#5
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
https://www.readbyqxmd.com/read/28356611/predatory-interactions-between-prey-affect-patch-selection-by-predators
#6
Yasuyuki Choh, Maurice W Sabelis, Arne Janssen
ABSTRACT: When predators can use several prey species as food sources, they are known to select prey according to foraging efficiency and food quality. However, interactions between the prey species may also affect prey choice, and this has received limited attention. The effect of one such interaction, intraguild predation between prey, on patch selection by predators was studied here. The predatory mite Neoseiulus californicus preys on young larvae of the western flower thrips Frankliniella occidentalis and on all stages of the two-spotted spider mite Tetranychus urticae...
2017: Behavioral Ecology and Sociobiology
https://www.readbyqxmd.com/read/28340275/mini-tomato-genotypes-resistant-to-the-silverleaf-whitefly-and-to-two-spotted-spider-mites
#7
G M Maciel, R S Almeida, J P R da Rocha, V Andaló, G R Marquez, N C Santos, R R Finzi
The mini tomato production has expanded, becoming an amazing alternative for enterprise. Despite all commercial potential, the cultivation has the occurrence of pests as main obstacle during the crop development. Nowadays, there are no researches that aimed obtaining genotypes with high acylsugar content, capable of providing a broad-spectrum resistance to pests. This study aimed the selection of mini tomato genotypes, with high acylsugar content, and checking the resistance level to the silverleaf whitefly [Bemisia tabaci (Gennadius)] and to the two-spotted spider mites (Tetranychus urticae Koch)...
March 22, 2017: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/28334233/does-long-term-feeding-on-alternative-prey-affect-the-biological-performance-of-neoseiulus-barkeri-acari-phytoseiidae-on-the-target-spider-mites
#8
Ya-Ying Li, Guo-Hao Zhang, Chuan-Bei Tian, Ming-Xiu Liu, Yi-Qing Liu, Huai Liu, Jin-Jun Wang
The predatory mite Neoseiulus barkeri (Hughes) is a good biological control agent for many small sucking pests. We aimed to determine whether rearing long term on alternative prey versus target prey species affected the performance of N. barkeri. Therefore, we investigated the prey preference, life tables, and population parameters of N. barkeri between alternative prey Tyrophagus putrescentiae (Schrank) and three species of spider mites, Tetranychus urticae Koch, Panonychus citri (McGregor), and Eotetranychus kankitus Ehara...
March 3, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28334066/effect-of-drive-row-ground-covers-on-hop-rosales-cannabaceae-yard-arthropod-pests-in-vermont-usa
#9
L Calderwood, J Cubins, D Vesty, H Darby
Alternatives to pesticides are necessary for the management of hop (Humulus lupulus L.) arthropod pests. The three major arthropod pests in northeastern US hop production include two-spotted spider mite, Tetranychus urticae Koch, hop aphid Phorodon humuli (Schrank), and potato leafhopper, Empoasca fabae Harris. This 3-yr study (2012-2014) in Vermont investigated the effect of flowering ground covers on arthropod pest abundance. Hop cultivars 'Nugget' and 'Cascade' were evaluated under a strip-split plot experimental design...
April 1, 2017: Environmental Entomology
https://www.readbyqxmd.com/read/28303192/adaptation-of-acaricide-stress-facilitates-tetranychus-urticae-expanding-against-tetranychus-cinnabarinus-in-china
#10
Wencai Lu, Mengyao Wang, Zhifeng Xu, Guangmao Shen, Peng Wei, Ming Li, William Reid, Lin He
The two-spotted spider mite, Tetranychus urticae, and the carmine spider mite, Tetranychus cinnabarinus, are invasive and native species in China, respectively. Compared with T. cinnabarinus, T. urticae has expanded into most parts of China and has become the dominant species of spider mite since 1983, when it was first reported in China. However, the mechanism of the demographic conversion has not been illuminated. In this study, one T. urticae field population and one T. cinnabarinus field population were isolated from the same plant in the same field, and the toxicological characteristics were compared between these two species...
February 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28217963/divergent-methylation-pattern-in-adult-stage-between-two-forms-of-tetranychus-urticae-koch-acari-tetranychidae
#11
Si-Xia Yang, Chao Guo, Xiu-Ting Zhao, Jing-Tao Sun, Xiao-Yue Hong
The two-spotted spider mite, Tetranychus urticae Koch has two forms: green form and red form. Understanding the molecular basis of how these two forms established without divergent genetic background is an intriguing area. As a well-known epigenetic process, DNA methylation has particularly important roles in gene regulation and developmental variation across diverse organisms that not alter genetic background. Here, to investigate whether DNA methylation could be associated with different phenotypic consequences in T...
February 19, 2017: Insect Science
https://www.readbyqxmd.com/read/28190801/acaricidal-potentials-of-the-terpene-rich-essential-oils-of-two-iranian-eucalyptus-species-against-tetranychus-urticae-koch
#12
Asgar Ebadollahi, Jalal Jalali Sendi, Mostafa Maroufpoor, Mehdi Rahimi-Nasrabadi
There is a rapid growth in the screening of plant materials for finding new bio-pesticides. In the present study, the essential oils of E. oleosa and E. torquata leaves were extracted using a Clevenger apparatus and their chemical profiles were investigated by Gas Chromatography-Mass Spectrometry (GC-MS). Among identified compounds, the terpenes had highest amount for both essential oils; 93.59% for E. oleosa and 97.69% for E. torquata. 1,8-Cineole (31.96%), α-pinene (15.25%) and trans-anethole (7.32%) in the essential oil of E...
February 10, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28106771/independent-effects-of-a-herbivore-s-bacterial-symbionts-on-its-performance-and-induced-plant-defences
#13
Heike Staudacher, Bernardus C J Schimmel, Mart M Lamers, Nicky Wybouw, Astrid T Groot, Merijn R Kant
It is well known that microbial pathogens and herbivores elicit defence responses in plants. Moreover, microorganisms associated with herbivores, such as bacteria or viruses, can modulate the plant's response to herbivores. Herbivorous spider mites can harbour different species of bacterial symbionts and exert a broad range of effects on host-plant defences. Hence, we tested the extent to which such symbionts affect the plant's defences induced by their mite host and assessed if this translates into changes in plant resistance...
January 18, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28043338/molecular-diagnostics-for-detecting-pyrethroid-and-abamectin-resistance-mutations-in-tetranychus-urticae
#14
Aris Ilias, Vassilis A Vassiliou, John Vontas, Anastasia Tsagkarakou
Avermectin and pyrethroid resistance mutations (the G314D and the G326E in the glutamate gated chloride channels, and the F1538I in the voltage gated sodium channel) have been reported in the spider mite Tetranychus urticae, one of the most devastating pests of protected and open field crops worldwide. We developed three TaqMan molecular diagnostic assays for monitoring the presence and frequency of these mutations in T. urticae field populations. The TaqMan assays were validated against known genotypes and subsequently used to monitor the frequency of the resistance mutations in eleven T...
January 2017: Pesticide Biochemistry and Physiology
https://www.readbyqxmd.com/read/28040863/male-spider-mites-use-chemical-cues-but-not-the-female-mating-interval-to-choose-between-mates
#15
Leonor R Rodrigues, Alexandre R T Figueiredo, Susana A M Varela, Isabelle Olivieri, Sara Magalhães
The choice of the partner an individual will mate with is expected to strongly impact its fitness. Hence, natural selection has favoured the evolution of cues to distinguish among mates that will provide different fitness benefits to the individual that is choosing. In species with first-male sperm precedence, this is particularly important for males, as mating with mated females will result in no offspring. In the spider mite Tetranychus urticae only the first mating is effective, except if the interval between first and second copulations is shorter than 24 h...
January 2017: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/28028106/imaginal-feeding-for-progression-of-diapause-phenotype-in-the-two-spotted-spider-mite-acari-tetranychidae
#16
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...
December 2016: Environmental Entomology
https://www.readbyqxmd.com/read/28001328/transcriptome-and-proteome-analyses-reveal-complex-mechanisms-of-reproductive-diapause-in-the-two-spotted-spider-mite-tetranychus-urticae
#17
J-Y Zhao, X-T Zhao, J-T Sun, L-F Zou, S-X Yang, X Han, W-C Zhu, Q Yin, X-Y Hong
Although a variety of factors underlying diapause have been identified in arthropods and other organisms, the molecular mechanisms regulating diapause are still largely unknown. Here, to better understand this process, we examined diapause-associated genes in the two-spotted spider mite, Tetranychus urticae, by comparing the transcriptomes and proteomes of early diapausing and reproductive adult females. Amongst genes underlying diapause revealed by the transcriptomic and proteomic data sets, we described the noticeable change in Ca(2+) -associated genes, including 65 Ca(2+) -binding protein genes and 23 Ca(2+) transporter genes, indicating that Ca(2+) signalling has a substantial role in diapause regulation...
December 21, 2016: Insect Molecular Biology
https://www.readbyqxmd.com/read/27988819/egg-hatching-response-to-a-range-of-ultraviolet-b-uv-b-radiation-doses-for-four-predatory-mites-and-the-herbivorous-spider-mite-tetranychus-urticae
#18
Dimitrios S Koveos, Takeshi Suzuki, Anastasia Terzidou, Anastasia Kokkari, George Floros, Petros Damos, Nikos A Kouloussis
Egg hatchability of four predatory mites-Phytoseiulus persimilis Athias-Henriot, Iphiseius [Amblyseius] degenerans Berlese, Amblyseius swirskii Athias-Henriot, and Euseius finlandicus Oudemans (Acari: Phytoseiidae)-and the spider mite Tetranychus urticae Koch (Acari: Tetranychidae) was determined under various UV-B doses either in constant darkness (DD) or with simultaneous irradiation using white light. Under UV-B irradiation and DD or simultaneous irradiation with white light, the predator's eggs hatched in significantly lower percentages than in the control non-exposed eggs, which indicates deleterious effects of UV-B on embryonic development...
January 2017: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/27986936/quarantine-treatments-of-imported-nursery-plants-and-exported-cut-flowers-by-phosphine-gas-ph3-as-methyl-bromide-alternative
#19
Bong Su Kim, Chung Gyoo Park, Young Mi Moon, Bo Kyung Sung, Yonglin Ren, Stephen J Wylie, Byung Ho Lee
Quarantine treatments by phosphine (PH3) gas have been performed to replace methyl bromide (MeBr) for export cut flowers and imported nursery plant in Korea. In this preliminary study, two dominant insect pests of cut flowers, Tetranychus urticae Koch and Frankliniella occidentalis Pergande, and the dominant insect pest of nursery plants, Planococcus citri Risso, were used to certify optimum concentration and fumigation time, along with evaluation of phytotoxic damages. To validate the results of preliminary tests, quarantine treatments for export cut flowers was performed in a 58-m(3) reefer container...
December 2016: Journal of Economic Entomology
https://www.readbyqxmd.com/read/27986934/effects-of-insecticides-and-fungicides-commonly-used-in-tomato-production-on-phytoseiulus-persimilis-acari-phtyoseiidae
#20
J L Ditillo, G G Kennedy, J F Walgenbach
The twospotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae), is an important pest of tomatoes in North Carolina. Resident populations of the predatory mite Phytoseiulus persimilis have recently been detected on field-grown tomatoes in central North Carolina, and potentially can be a useful biological control agent against T. urticae Laboratory bioassays were used to assess lethal and reproductive effects of 10 insecticides and five fungicides commonly used in commercial tomato production (chlorantraniliprole, spinetoram, permethrin, imidacloprid, dimethoate, dinotefuran, thiamethoxam, bifenthrin, fenpropathrin, lambda-cyhalothrin, azoxystrobin, chlorothalonil, boscalid, cyazofamid, and mancozeb) on P...
December 2016: Journal of Economic Entomology
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