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https://www.readbyqxmd.com/read/29769620/carvacrol-and-linalool-co-loaded-in-%C3%AE-cyclodextrin-grafted-chitosan-nanoparticles-as-sustainable-biopesticide-aiming-pest-control
#1
Estefânia V R Campos, Patrícia L F Proença, Jhones L Oliveira, Anderson E S Pereira, Lígia Nunes de Morais Ribeiro, Fabrício O Fernandes, Kelly C Gonçalves, Ricardo A Polanczyk, Tatiane Pasquoto-Stigliani, Renata Lima, Cirano C Melville, Jaqueline F Della Vechia, Daniel J Andrade, Leonardo F Fraceto
Pesticides are the main tactics for pest control because they reduce the pest population very fast and their efficiency does not depend on abiotic factors. However, the indiscriminate use of these substances can speed up the development of resistant populations and causing environmental contamination. Therefore, alternative methods of pest control are sought, such as the use of botanical compounds. Nanoencapsulation of volatile compounds has been shown to be an important tool that can be used to overcome the lack of stability of these compounds...
May 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29768484/herbivory-responsive-calmodulin-like-protein-cml9-does-not-guide-jasmonate-mediated-defenses-in-arabidopsis-thaliana
#2
Monika Heyer, Sandra S Scholz, Dagmar Voigt, Michael Reichelt, Didier Aldon, Ralf Oelmüller, Wilhelm Boland, Axel Mithöfer
Calcium is an important second messenger in plants that is released into the cytosol early after recognition of various environmental stimuli. Decoding of such calcium signals by calcium sensors is the key for the plant to react appropriately to each stimulus. Several members of Calmodulin-like proteins (CMLs) act as calcium sensors and some are known to mediate both abiotic and biotic stress responses. Here, we study the role of the Arabidopsis thaliana CML9 in different stress responses. CML9 was reported earlier as defense regulator against Pseudomonas syringae...
2018: PloS One
https://www.readbyqxmd.com/read/29767731/development-and-reproduction-of-neoseiulus-californicus-acari-phytoseiidae-and-tetranychus-urticae-acari-tetranychidae-under-simulated-natural-temperature
#3
Noureldin Abuelfadl Ghazy, Takeshi Suzuki, Hiroshi Amano
Although laboratory observations provide basic knowledge of the development and reproduction of predacious and phytophagous mites, little is known of their behavior under natural conditions. Using a closed system designed to simulate natural climate patterns, we investigated the development and reproduction of the predatory mite Neoseiulus californicus (McGregor) (Acari: Phytoseiidae) and the pest mite Tetranychus urticae Koch (Acari: Tetranychidae) at air temperatures typical of June to October at three latitudes (Aomori, Tottori, and Naha) in Japan...
May 14, 2018: Environmental Entomology
https://www.readbyqxmd.com/read/29761305/uv-b-susceptibility-and-photoreactivation-in-embryonic-development-of-the-two-spotted-spider-mite-tetranychus-urticae
#4
Yoshio Yoshioka, Tetsuo Gotoh, Takeshi Suzuki
Developmental errors are often induced in the embryos of many organisms by environmental stress. Ultraviolet-B radiation (UV-B) is one of the most serious environmental stressors in embryonic development. Here, we investigated susceptibility to UV-B (0.5 kJ m-2 ) in embryos of the two-spotted spider mite, Tetranychus urticae, to examine the potential use of UV-B in control of this important agricultural pest worldwide. Peak susceptibility to UV-B (0% hatchability) was found in T. urticae eggs 36-48 h after oviposition at 25 °C, which coincides with the stages of morphogenesis forming the germ band and initial limb primordia...
May 14, 2018: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/29757437/fumigation-activity-of-ethyl-formate-and-phosphine-against-tetranychus-urticae-acari-tetranychidae-on-imported-sweet-pumpkin
#5
Jae Seon Lee, Hyun Kyung Kim, Yejin Kyung, Geun-Ho Park, Byung-Ho Lee, Jeong-Oh Yang, Hyun-Na Koo, Gil-Hah Kim
This study investigated an alternative fumigant for imported sweet pumpkin. Laboratory fumigations with ethyl formate (EF) and phosphine (PH3) alone and in combination were conducted at different temperatures in 12-liter desiccators to determine their efficacy and synergism against adults and eggs of two-spotted spider mites (Tetranychus urticae Koch), a major pest of sweet pumpkins; larger scale fumigations with EF were also performed to evaluate the impact of EF fumigation on the postharvest quality of sweet pumpkin and EF absorption...
May 10, 2018: Journal of Economic Entomology
https://www.readbyqxmd.com/read/29756384/performance-of-metarhizium-anisopliae-treated-foam-in-combination-with-phytoseiulus-longipes-evans-on-tetranychus-evansi-baker-pritchard-acari-tetranychidae
#6
Ginette Y Azandémè Hounmalon, Nguya K Maniania, Saliou Niassy, Simon Fellous, Serge Kreiter, Emilie Delétré, Komi K Fiaboe, Thibaud Martin
BACKGROUND: Tetranychus evansi (Te) is an exotic pest of solanaceous crops in Africa. The predatory mite Phytoseiulus longipes (Pl) and the fungus Metarhizium anisopliae (Ma), are potential biocontrol agents of Te. The present study investigated efficacy of fungus-treated foam placed above or below the third Te-infested tomato leaf. The persistence of fungus-treated foam and the performance of Pl with or without fungus-treated foam were evaluated. RESULTS: The fungus-treated foam was effective when Te infestation was below the third tomato leaf as no damage was recorded on all upper tomato leaves up to 30 days post-treatment...
May 13, 2018: Pest Management Science
https://www.readbyqxmd.com/read/29741605/intercropping-with-fruit-trees-increases-population-abundance-and-alters-species-composition-of-spider-mites-on-cotton
#7
Haiqiang Li, Hongsheng Pan, Dongmei Wang, Bing Liu, Jian Liu, Jianping Zhang, Yanhui Lu
With the recent increase in planting of fruit trees in southern Xinjiang, the intercropping of fruit trees and cotton has been widely adopted. From 2014 to 2016, a large-scale study was conducted in Aksu, an important agricultural area in southern Xinjiang, to compare the abundance and species composition of spider mites in cotton fields under jujube-cotton, apple-cotton, and cotton monocrop systems. The abundance of spider mites in cotton fields under both intercropping systems was generally higher than in the cotton monocrop...
May 5, 2018: Environmental Entomology
https://www.readbyqxmd.com/read/29695088/synthesis-and-acaricidal-activities-of-scopoletin-phenolic-ether-derivatives-qsar-molecular-docking-study-and-in-silico-adme-predictions
#8
Jinxiang Luo, Ting Lai, Tao Guo, Fei Chen, Linli Zhang, Wei Ding, Yongqiang Zhang
Thirty phenolic ether derivatives of scopoletin modified at the 7-hydroxy position were synthesized, and their structures were confirmed by IR, ¹H-NMR, 13 C-NMR, MS and elemental analysis. Preliminary acaricidal activities of these compounds against female adults of Tetranychus cinnabarinus (Boisduval) were evaluated using the slide-dip method. The results indicated that some of these compounds exhibit more pronounced acaricidal activity than scopoletin, especially compounds 32 , 20 , 28 , 27 and 8 which exhibited about 8...
April 24, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29688599/uv-c-irradiation-as-a-management-tool-for-tetranychus-urticae-on-strawberries
#9
Brent D Short, Wojciech Janisiewicz, Fumiomi Takeda, Tracy C Leskey
BACKGROUND: Tetranychus urticae Koch, the two-spotted spider mite, is a highly polyphagous and worldwide pest of many agricultural crops, including fruit, vegetables, and ornamentals. Typical methods of control include applications of acaricides and biological control agents. Here, we present a non-chemical technology for management of T. urticae on strawberry plants through the use of a nightly short duration UV-C irradiation treatment. RESULTS: Potted strawberry plants infested with T...
April 24, 2018: Pest Management Science
https://www.readbyqxmd.com/read/29685655/synthesis-of-novel-quinolinomatrine-derivatives-and-their-insecticidal-acaricidal-activities
#10
Jiulin Huang, Min Lv, Sunita Thapa, Hui Xu
In continuation of our program to discover natural product-based pesticidal agents, a series of new quinolinomatrine derivatives were prepared. Especially three-dimensional structures of five compounds were unambiguously determined by single-crystal X-ray diffraction. Among them, 21-chloroquinolinomatrine exhibited good insecticidal and acaricidal activities against two crop-threatening insect pests, Mythimna separata and Tetranychus cinnabarinus. Their structure-activity relationships were also discussed.
April 12, 2018: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/29681917/dehydration-stress-contributes-to-the-enhancement-of-plant-defense-response-and-mite-performance-on-barley
#11
M E Santamaria, Isabel Diaz, Manuel Martinez
Under natural conditions, plants suffer different stresses simultaneously or in a sequential way. At present, the combined effect of biotic and abiotic stressors is one of the most important threats to crop production. Understanding how plants deal with the panoply of potential stresses affecting them is crucial to develop biotechnological tools to protect plants. As well as for drought stress, the economic importance of the spider mite on agriculture is expected to increase due to climate change. Barley is a host of the polyphagous spider mite Tetranychus urticae and drought produces important yield losses...
2018: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29678924/sirnas-and-pirnas-collaborate-for-transposon-control-in-the-two-spotted-spider-mite
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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/29548577/synthesis-of-novel-isoxazoline-containing-podophyllotoxin-2-2-6-di-halogenopodophyllotoxin-derivatives-and-their-insecticidal-acaricidal-activities
#18
Ruige Yang, Yuanyuan Zhang, Hui Xu
In continuation of our program aimed at the development of natural product-based pesticidal agents, a series of isoxazoline-containing podophyllotoxin/2'(2',6')-(di)halogenopodophyllotoxin derivatives were prepared, and their structures were well characterized by 1 H NMR, IR, optical rotation, HRMS and mp. Especially the structure of compound Ia was further confirmed by 1 H-1 H COSY and NOESY spectrum. Among them, two compounds showed good insecticidal and acaricidal activities against Mythimna separata and Tetranychus cinnabarinus...
May 1, 2018: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/29524004/antixenosis-and-antibiosis-response-of-common-bean-phaseolus-vulgaris-to-two-spotted-spider-mite-tetranychus-urticae
#19
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...
April 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
#20
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...
May 2018: Experimental & Applied Acarology
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