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https://www.readbyqxmd.com/read/28433752/serotonergic-transmission-and-gap-junctional-coupling-in-proventricular-muscle-cells-in-the-american-cockroach-periplaneta-americana
#1
Ryoichi Yoshimura, Taeko Suetsugu, Yasuhisa Endo
The visceral muscle tissues of insects consist of striated muscle cells. The mechanisms responsible for delivering signals to the contractile muscles in the insect digestive tract remain unclear. We found that serotonergic nerves innervate the hemocoel surfaces of foregut and midgut muscles in the American cockroach. Electron microscopy of the neuromuscular junctions in the proventriculus (gizzard) revealed typical synaptic structures, the accumulation of large core/cored vesicles (neuropeptides) and small clear vesicle (neurotransmitter) at presynapses, and synaptic clefts...
April 19, 2017: Journal of Insect Physiology
https://www.readbyqxmd.com/read/28428867/adaptative-evolution-of-the-vkorc1-gene-in-mus-musculus-domesticus-is-influenced-by-the-selective-pressure-of-anticoagulant-rodenticides
#2
Joffrey Goulois, Véronique Lambert, Lionel Legros, Etienne Benoit, Virginie Lattard
Anticoagulant rodenticides are commonly used to control rodent pests worldwide. They specifically inhibit the vitamin K epoxide reductase (VKORC1), which is an enzyme encoded by the Vkorc1 gene, involved in the recycling of vitamin K. Therefore, they prevent blood clotting. Numerous mutations of Vkorc1 gene were reported in rodents, and some are involved in the resistant to rodenticides phenotype. Two hundred and sixty-six mice tails were received from 65 different locations in France. Coding sequences of Vkorc1 gene were sequenced in order to detect mutations...
April 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28428863/switching-among-natal-and-auxiliary-hosts-increases-vulnerability-of-spodoptera-exigua-h%C3%A3-bner-lepidoptera-noctuidae-to-insecticides
#3
Qamar Saeed, Shafqat Saeed, Faheem Ahmad
The role of insecticidal application and host plant resistance in managing Spodoptera exigua has been well documented, but the effect of different host plants, on which the pest cycles its population in the field, has seldom been investigated. Therefore, we have studied the vulnerability of S. exigua against commonly used insecticides (cypermethrin, chlorpyrifos, lufenuron, and emamectin benzoate) with different mode of actions when it switches its generations from natal to auxiliary hosts and vice versa. Different field populations being established on different host plants including castor, cauliflower, cotton, okra, and spinach were collected and reared in the laboratory before insecticidal bioassays...
April 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28428851/screening-mitochondrial-dna-sequence-variation-as-an-alternative-method-for-tracking-established-and-outbreak-populations-of-queensland-fruit-fly-at-the-species-southern-range-limit
#4
Mark J Blacket, Mali B Malipatil, Linda Semeraro, Peter S Gillespie, Bernie C Dominiak
Understanding the relationship between incursions of insect pests and established populations is critical to implementing effective control. Studies of genetic variation can provide powerful tools to examine potential invasion pathways and longevity of individual pest outbreaks. The major fruit fly pest in eastern Australia, Queensland fruit fly Bactrocera tryoni (Froggatt), has been subject to significant long-term quarantine and population reduction control measures in the major horticulture production areas of southeastern Australia, at the species southern range limit...
April 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28426676/economic-injury-levels-for-asian-citrus-psyllid-control-in-process-oranges-from-mature-trees-with-high-incidence-of-huanglongbing
#5
Cesar Monzo, Philip A Stansly
The Asian citrus psyllid (ACP), Diaphorina citri Kuwayama, is the key pest of citrus wherever it occurs due to its role as vector of huanglongbing (HLB) also known as citrus greening disease. Insecticidal vector control is considered to be the primary strategy for HLB management and is typically intense owing to the severity of this disease. While this approach slows spread and also decreases severity of HLB once the disease is established, economic viability of increasingly frequent sprays is uncertain. Lacking until now were studies evaluating the optimum frequency of insecticide applications to mature trees during the growing season under conditions of high HLB incidence...
2017: PloS One
https://www.readbyqxmd.com/read/28425475/insecticidal-activity-of-garlic-essential-oil-and-their-constituents-against-the-mealworm-beetle-tenebrio-molitor-linnaeus-coleoptera-tenebrionidae
#6
Angelica Plata-Rueda, Luis Carlos Martínez, Marcelo Henrique Dos Santos, Flávio Lemes Fernandes, Carlos Frederico Wilcken, Marcus Alvarenga Soares, José Eduardo Serrão, José Cola Zanuncio
This study evaluated the insecticidal activity of garlic, Allium sativum Linnaeus (Amaryllidaceae) essential oil and their principal constituents on Tenebrio molitor. Garlic essential oil, diallyl disulfide, and diallyl sulfide oil were used to compare the lethal and repellent effects on larvae, pupae and adults of T. molitor. Six concentrations of garlic essential oil and their principal constituents were topically applied onto larvae, pupae and adults of this insect. Repellent effect and respiration rate of each constituent was evaluated...
April 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28424477/warming-impact-on-herbivore-population-composition-affects-top-down-control-by-predators
#7
Ying-Jie Wang, Takefumi Nakazawa, Chuan-Kai Ho
Understanding warming impact on herbivores facilitates predicting plant/crop dynamics in natural/agricultural systems. However, it remains unclear how warming will affect herbivore population size and population composition, consequently altering herbivore colonization in a tri-trophic system (plant-herbivore-predator or crop-pest-biocontrol agent). We studied a soybean-aphid-lady beetle system, by conducting (1) a laboratory warming experiment to examine warming impact (+2 °C or +4 °C) on the aphid population size and composition (alate proportion), and (2) a field colonization experiment to examine whether the warming-induced effect subsequently interacts with predators (lady beetles) in affecting aphid colonization...
April 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28424465/predicting-the-potential-distribution-in-china-of-euwallacea-fornicates-eichhoff-under-current-and-future-climate-conditions
#8
Xuezhen Ge, Chao Jiang, Linghong Chen, Shuang Qiu, Yuxiang Zhao, Tao Wang, Shixiang Zong
Euwallacea fornicatus (Eichhoff) is an important forest pest that has caused serious damage in America and Vietnam. In 2014, it attacked forests of Acer trialatum in the Yunnan province of China, creating concern in China's Forestry Bureau. We used the CLIMEX model to predict and compare the potential distribution for E. fornicates in China under current (1981-2010) and projected climate conditions (2011-2040) using one scenario (RCP8.5) and one global climate model (GCM), CSIRO-Mk3-6-0. Under both current and future climate conditions, the model predicted E...
April 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28423430/bioactivity-of-novel-botanical-insecticide-from-gnidia-kaussiana-thymeleaceae-against-callosobruchus-maculatus-coleoptera-chrysomelidae-in-stored-vigna-subterranea-fabaceae-grains
#9
D Kosini, E N Nukenine
Hexane, acetone, and methanol extracts from Gnidia kaussiana Meisn (Thymeleaceae), each at two dosages (0.2 and 1 ml/50 g grains corresponding, respectively to 1 and 5g/kg), and neem seed oil (NSO), used as standard insecticide were evaluated for repellence, toxicity to Callosobruchus maculatus (F.) (Coleoptera: Chrysomelidae) adults, F1 progeny inhibition, persistence and as grain protectant during storage. Experiments were laid out at complete randomized design with five replications for repellence test and four for others...
January 1, 2017: Journal of Insect Science
https://www.readbyqxmd.com/read/28423414/discovery-development-and-evaluation-of-a-horn-fly-isolated-diptera-muscidae-beauveria-bassiana-hypocreales-cordyciptaceae-strain-from-florida-usa
#10
Christopher J Holderman, Lois A Wood, Christopher J Geden, Phillip E Kaufman
The horn fly, Haematobia irritans (L.) is an important cattle pest and traditionally has been managed using insecticides; however, many horn fly populations are insecticide-resistant in United States. Use of alternative control techniques has been limited because of the challenges of managing a fly pest on pastured cattle. After the discovery of a wild horn fly infected with Beauveria bassiana in Florida, the fungus was cultured and evaluated for efficacy against laboratory-reared horn flies. This fungal strain was selected for increased virulence by passage through laboratory-reared horn fly hosts to shorten interval from infection to fly death and subsequent conidia formation, properties important to future use of the fungus as a biological control agent against horn flies...
January 1, 2017: Journal of Insect Science
https://www.readbyqxmd.com/read/28423037/identification-of-candidate-chemosensory-genes-by-transcriptome-analysis-in-loxostege-sticticalis-linnaeus
#11
Hong-Shuang Wei, Ke-Bin Li, Shuai Zhang, Ya-Zhong Cao, Jiao Yin
Loxostege sticticalis Linnaeus is an economically important agricultural pest, and the larvae cause great damage to crops, especially in Northern China. However, effective and environmentally friendly chemical methods for controlling this pest have not been discovered to date. In the present study, we performed HiSeq2500 sequencing of transcriptomes of the male and female adult antennae, adult legs and third instar larvae, and we identified 54 candidate odorant receptors (ORs), including 1 odorant receptor coreceptor (Orco) and 5 pheromone receptors (PRs), 18 ionotropic receptors (IRs), 13 gustatory receptors (GRs), 34 odorant binding proteins (OBPs), including 1 general odorant binding protein (GOBP1) and 3 pheromone binding proteins (PBPs), 10 chemosensory proteins (CSPs) and 2 sensory neuron membrane proteins (SNMPs)...
2017: PloS One
https://www.readbyqxmd.com/read/28423007/recombinants-from-the-crosses-between-amphidiploid-and-cultivated-peanut-arachis-hypogaea-for-pest-resistance-breeding-programs
#12
Ailton Ferreira de Paula, Naiana Barbosa Dinato, Bianca Baccili Zanotto Vigna, Alessandra Pereira Fávero
Peanut is a major oilseed crop worldwide. In the Brazilian peanut production, silvering thrips and red necked peanut worm are the most threatening pests. Resistant varieties are considered an alternative to pest control. Many wild diploid Arachis species have shown resistance to these pests, and these can be used in peanut breeding by obtaining hybrid of A and B genomes and subsequent polyploidization with colchicine, resulting in an AABB amphidiploid. This amphidiploid can be crossed with cultivated peanut (AABB) to provide genes of interest to the cultivar...
2017: PloS One
https://www.readbyqxmd.com/read/28422495/cochliotoxin-a-dihydropyranopyran-4-5-dione-and-its-analogues-produced-by-cochliobolus-australiensis-display-phytotoxic-activity-against-buffelgrass-cenchrus-ciliaris
#13
Marco Masi, Susan Meyer, Suzette Clement, Alessio Cimmino, Massimo Cristofaro, Antonio Evidente
Buffelgrass (Pennisetum ciliare or Cenchrus ciliaris) is a perennial grass that has become highly invasive in the Sonoran Desert of southern Arizona. In the search for novel control strategies against this weed, strains of the foliar fungal pathogen Cochliobolus australiensis from buffelgrass have been screened for their ability to produce phytotoxic metabolites that could potentially be used as natural herbicides in an integrated pest management strategy. A new phytotoxin, named cochliotoxin, was isolated from liquid culture of this fungus together with radicinin, radicinol, and their 3-epimers...
April 19, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/28422455/a-decade-of-a-leafminer-invasion-in-china-lessons-learned
#14
REVIEW
Yulin Gao, Stuart Reitz, Zhenlong Xing, Scott Ferguson, Zhongren Lei
Liriomyza trifolii (Burgess) is a highly invasive species that has become established in agricultural and ornamental crops throughout the world. L. trifolii was first recorded in China in 2005 in Guangdong Province. Subsequently, its known distribution in China has rapidly expanded to another 11 provinces (Zhejiang, Jiangsu, Shanghai, Fujian, Guangxi, Shandong, Hainan, Hebei, Henan, Hubei and Anhui), where it is currently causing considerable damage and economic losses. Experimental research and field surveys have contributed to our understanding of the ecology of L...
April 19, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28422413/essential-oils-as-biocides-for-the-control-of-fungal-infections-and-devastating-pest-tuta-absoluta-of-tomato-lycopersicon-esculentum-mill
#15
Samira Bouayad Alam, Mohammed El Amine Dib, Nassim Djabou, Boufeldja Tabti, Nassira Guaouar, Jean Costa, Alain Muselli
Thymus capitatus and Tetraclinis articulata essential oils as well their major components (carvacrol and α-pinene) were evaluated for their antifungal and insecticidal activities. Both oils showed good in vitro antifungal activity against Fusarium oxysporum, Aspergillus niger, Penicillium sp, Alternaria alternata and Botrytis cinerea, the fungi causing tomato rot. In vivo results indicate the efficacies of both essential oils and carvacrol of reduce postharvest fungal pathogens, such as B. cinerea and A. alternata that are responsible of black and gray rot of tomato fruit...
April 19, 2017: Chemistry & Biodiversity
https://www.readbyqxmd.com/read/28420198/chemical-constituents-of-supercritical-extracts-from-alpinia-officinarum-and-the-feeding-deterrent-activity-against-tribolium-castaneum
#16
Mintong Xin, Shanshan Guo, Wenjuan Zhang, Zhufeng Geng, Junyu Liang, Shushan Du, Zhiwei Deng, Yongyan Wang
Alpinia officinarum has been confirmed to possess bioactivities against some pests. In this work, a sample was obtained from A. officinarum rhizomes by supercritical fluid CO₂ extraction (SFE). According to GC-MS analysis, the main chemical components for SFE-sample included benzylacetone (26.77%), 1,7-diphenyl-5-hydroxy-3-heptanone (17.78%), guaiacylacetone (10.03%) and benzenepropanal (7.42%). The essential oil of A. officinarum rhizomes (LD50 = 20.71 μg/adult) exhibited more contact toxicity than SFE extract (LD50 = 82...
April 18, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28418764/disease-surveillance-of-california-ground-squirrels-spermophilus-beecheyi-in-a-drive-through-zoo-in-oregon-usa
#17
Julia Ter Beest, Andrew Cushing, Modesto McClean, Wendy Hsu, Robert Bildfell
Rodents and other small wild mammals are often considered to be pests and vectors for disease in zoos that house small populations of valuable threatened and endangered animals. In 2005, three nonhuman primates at a drive-through zoo in Oregon, USA, acquired tularemia from an unknown source. Due to an abundance of California ground squirrels ( Spermophilus beecheyi ) on zoo grounds, we instituted serosurveillance of this species from July through September 2008 to determine the prevalence of antibodies against pathogens considered to be potentially transmissible to collection animals...
April 18, 2017: Journal of Wildlife Diseases
https://www.readbyqxmd.com/read/28417946/essential-oils-of-hyptis-pectinata-chemotypes-isolation-binary-mixtures-and-acute-toxicity-on-leaf-cutting-ants
#18
Rosana B Feitosa-Alcantara, Leandro Bacci, Arie F Blank, Péricles B Alves, Indira Morgana de A Silva, Caroline A Soares, Taís S Sampaio, Paulo Cesar de L Nogueira, Maria de Fátima Arrigoni-Blank
Leaf-cutting ants are pests of great economic importance due to the damage they cause to agricultural and forest crops. The use of organosynthetic insecticides is the main form of control of these insects. In order to develop safer technology, the objective of this work was to evaluate the formicidal activity of the essential oils of two Hyptis pectinata genotypes (chemotypes) and their major compounds on the leaf-cutting ants Acromyrmex balzani Emery and Atta sexdens rubropilosa Forel. Bioassays of exposure pathways (contact and fumigation) and binary mixtures of the major compounds were performed...
April 12, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28417909/interactions-among-the-predatory-midge-aphidoletes-aphidimyza-diptera-cecidomyiidae-the-fungal-pathogen-metarhizium-brunneum-ascomycota-hypocreales-and-maize-infesting-aphids-in-greenhouse-mesocosms
#19
Ana Gorete Campos de Azevedo, Bernhardt Michael Steinwender, Jørgen Eilenberg, Lene Sigsgaard
The generalist entomopathogenic fungus, Metarhizium brunneum, has proved to have great potential as a versatile biological pest control agent. The gall midge Aphidoletes aphidimyza is a specialist predator that occurs naturally in Europe and has been successfully used for aphid suppression. However, the interaction between these two biological control organisms and how it may affect the biological control of aphids awaits further investigation. As part of the EU-supported project INBIOSOIL, this study was conducted in greenhouse conditions to assess the possible effects of combining both biological control agents...
April 12, 2017: Insects
https://www.readbyqxmd.com/read/28409935/assessment-of-two-solid-anaerobic-digestate-soil-amendments-for-effects-on-soil-quality-and-biosolarization-efficacy
#20
Jesus Dionisio Fernandez-Bayo, Yigal Achmon, Duff R Harrold, Dlinka G McCurry, Katie Hernandez, Ruth M Dahlquist-Willard, James J Stapleton, Jean S VanderGheynst, Christopher W Simmons
Anaerobic digestion is an organic waste bioconversion process that produces biofuel and digestates. Digestates have potential to be applied as soil amendment to improve properties for crop production including phytonutrient content and pest load. Our objective was to assess the impact of solid anaerobic digestates on weed seed inactivation and soil quality upon soil biosolarization (a pest control technique that combines solar heating and amendment-induced microbial activity). Two solid digestates from thermophilic (TD) and a mesophilic (MD) digesters were tested...
April 14, 2017: Journal of Agricultural and Food Chemistry
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