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Taylor's power law parameters from the regression of log variance versus log mean suggested aggregated spatial patterns for immature and adult stages combined for O. Using the parameters from Taylor's power law and Green's method, sequential fixed-precision sampling plans were developed to estimate the density for each predator taxon at desired precision levels of 0. To achieve a desired precision of 0.
Resulting ASNs were relatively large and assumed impractical for most purposes; therefore, the desired precision levels were adjusted to determine the level of precision associated with a more practical ASN. Final analysis indicated an ASN of 38 soybean plants provided precision of 0.
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Development of sampling plans should provide guidance for improved estimation of predator densities for A. Chen, Xiaorui; Hitchings, Matthew D. Pest control in agriculture employs diverse strategies, among which the use of predatory insects has steadily increased. The use of several species within the genus Orius in pest control is widely spread, particularly in Mediterranean Europe.
Commercial mass rearing of predatory insects is costly, and research efforts have concentrated on diet manipulation and selective breeding to reduce costs and improve efficacy. The characterisation and contribution of microbial symbionts to Orius sp. This paper provides the first genome sequence level description of the predominant culturable facultative bacterial symbionts associated with five Orius species O. Two types of symbionts were broadly classified as members of the genera Serratia and Leucobacter, while a third constitutes a new genus within the Erwiniaceae.
These symbionts were found to colonise all the insect specimens tested, which evidenced an ancestral symbiotic association between these bacteria and the genus Orius. Pangenome analyses of the Serratia sp. A taxonomic study of Chinese species of the insidiosus group of Metaphycus Hymenoptera, Encyrtidae.
Abstract In this paper, twelve insidiosus -group species of the genus Metaphycus Mercet from China are reviewed. Five species, M. A key to the females of these species is given to facilitate species recognition. Photomicrographs are provided to illustrate morphological characters of these species. Using organic-certified rather than synthetic pesticides may not be safer for biological control agents: selectivity and side effects of 14 pesticides on the predator Orius laevigatus.
The generalist predator Orius laevigatus Fieber Hemiptera : Anthocoridae is a key natural enemy of various arthropods in agricultural and natural ecosystems. Releases of this predator are frequently carried out, and it is included in the Integrated Pest Management IPM programs of several crops. The accurate assessment of the compatibility of various pesticides with predator activity is key for the success of this strategy.
We assessed acute and sublethal toxicity of 14 pesticides on O. Pesticides commonly used in either conventional or organic farming were selected for the study, including six biopesticides, three synthetic insecticides, two sulfur compounds and three adjuvants. To assess the pesticides' residual persistence, the predator was exposed for 3d to pesticide residues on tomato sprouts that had been treated 1 h, 7 d or 14 d prior to the assay. The percentage of mortality and the sublethal effects on predator reproductive capacity were summarized in a reduction coefficient E x and the pesticides were classified according to the IOBC International Organization for Biological Control toxicity categories.
The results showed that the pesticides greatly differed in their toxicity, both in terms of lethal and sub lethal effects, as well as in their persistence.
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Spinosad, emamectin, metaflumizone were moderately harmful until 7 d after the treatment, while the other pesticides were slightly harmful or harmless. The results, based on the combination of assessment of acute mortality, predator reproductive capacity pesticides residual and pesticides residual persistence, stress the need of using complementary bioassays e. We report the complete genome sequence of Clavibacter michiganensis subsp.
The R genome, generated by de novo assembly of PacBio sequencing data, is the first complete genome sequence available for this subspecies Complete Genome Sequence of Clavibacter michiganensis subsp. We report here the complete genome sequence of Clavibacter michiganensis subsp.
The R genome, generated by a de novo assembly of PacBio sequencing data, is the first complete genome sequence available for this subspecies. True bugs Hemiptera , Heteroptera as psyllid predators Hemiptera , Psylloidea. Abstract Data on natural enemies of psyllids are rare and can usually be found in papers about economically significant species.
During an investigation of psyllid fauna in Serbia, natural enemies were investigated, too. True bugs were the most numerous among them. From 28 psyllid species, 21 species of true bugs from families Anthocoridae and Miridae were reared. The aim of the research was to provide list of true bugs recorded as predators of psyllids in order to preserve their diversity and significance, especially on cultivated plants. Saproxylic Hemiptera Habitat Associations. Understanding the habitat requirements of organisms associated with dead wood is important in order to conserve them in managed forests.
Unfortunately, many of the less diverse saproxylic taxa, including Hemiptera , remain largely unstudied. An effort to rear insects from dead wood taken from two forest types an upland pine-dominated and a bottomland mixed hardwood , Orius minutus L. Heteroptera: Anthocoridae is a natural enemy of agricultural pests such as thrips, aphids, and various newly hatched insect juveniles. In this study, we conducted 1 behavioral assays for evidence of contact sex pheromone activity in trails of O.
Males showed arrestment to trails of mature virgin females but not to trails from either conspecific nymphs or immature females. Females also showed arrestment to trails from conspecific males, although the response was weaker than that exhibited by males. The activity of female trails lasted for at least 46 h after deposition.
Males showed a response irrespective of mating experience. Following confirmation that a contact sex pheromone was present in the trails of female O. After fractionation on silica gel, the n-hexane fraction was found to be biologically active to males. A major compound in the active fraction was Z nonacosene; this compound was found only in trail extracts of mature virgin females.
Synthetic Z nonacosene arrested O. The maximum developmental period of All models were validated under field conditions and diel temperature variations. The thermal requirement for complete development, from egg to adult, was With the results obtained herein, the optimization of O. Fumigant toxicity of basil oil compounds and related compounds to Thrips palmi and Orius strigicollis.
This study was aimed at assessing the fumigant toxicity to adult Thrips palmi a serious insect pest and Orius strigicollis a beneficial predator insect of basil Ocimum basilicum essential oil compounds and structurally related compounds using vapour-phase toxicity bioassays.
Against adult T. Strong fumigant toxicity was also observed in pulegone 0. Against adult O. Based upon the selective toxicity ratio, the compounds described are more selective than dichlorvos. The basil oil compounds described merit further study as potential insecticides for control of T. Effect of new and old pesticides on Orius armatus Gross - an Australian predator of western flower thrips, Frankliniella occidentalis Pergande. Orius armatus Gross is an important predator of western flower thrips, Frankliniella occidentalis Pergande Thysanoptera: Thripidae in Australian glasshouse grown sweet pepper.
The failure of O.derivid.route1.com/crnicas-del-camino-ii.php
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The residual toxicity via direct and indirect contact of several older and newer chemistry pesticides were evaluated. In addition, the effect of several systemic insecticides through insecticide-treated food-chain uptake was tested. Older chemistry pesticides methamidophos, dimethoate were toxic to Orius armatus, except pirimicarb which was non-toxic. Newer chemistry pesticides differed in their suitability. Abamectin was toxic to adults and nymphs. Chlorantraniliprole, imidacloprid and spirotetramat were non-toxic.
Spinosad and spinetoram were moderately toxic to O. The selective pesticides do not necessarily facilitate the conservation of beneficials, and further assessment of the various developmental stages and other sub-lethal effects of chlorantraniliprole, imidacloprid, pymetrozine, spinetoram, and spirotetramat is recommended. Laboratory and extended laboratory bioassays were conducted to determine the residual toxicities of various insecticides against two key pests of cranberries, Sparganothis sulfureana and Choristoneura parallela Lepidoptera: Tortricidae , and their non-target effects on the predatory Orius insidiosus Hemiptera : Anthocoridae.
The effects of nine insecticides with different modes of action on S. The organophosphate chlorpyrifos and the spinosyn spinetoram provided long-lasting seven-day control against all stages of both pests. The growth regulator methoxyfenozide and the diamides chlorantraniliprole and cyantraniliprole had strong 1—7 days larvicidal, particularly on young larvae, and growth inhibitory activity, but only the diamides were adulticidal.
Among neonicotinoids, acetamiprid had stronger ovicidal and adulticidal activity than thiamethoxam, showing within-insecticide class differences in toxicities; however, both were weak on larvae. Lethality of novaluron and indoxacarb was inconsistent, varying depending on species and stage. Chlorpyrifos was most toxic to O. These results show species- and stage-specific toxicities, and greater compatibility with biological control, of the newer reduced-risk classes of insecticides than older chemistries.
The growth regulator methoxyfenozide and the diamides chlorantraniliprole and cyantraniliprole had strong days larvicidal, particularly on young larvae, and growth inhibitory activity, but only the diamides were adulticidal. Gender- and species-specific characteristics of bacteriomes from three psyllid species Hemiptera : Psylloidae. Psyllids Hemiptera : Pyslloidea harbor bacterial symbionts in specialized organs called bacteriomes.
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Bacteriomes may be subject to manipulation to control psyllid pests including Bactericera cockerelli Sulc Hemiptera : Triozidae and Cacopsylla pyricola Forster Hemiptera : Psyllidae if the bi The Stenopodainae Hemiptera , Heteroptera of Argentina. Abstract In Argentina, 10 genera and 33 species of Stenopodainae Hemiptera : Reduviidae have been recorded. Diagnoses of the genera, subgenera and species are given, and an illustrated key to genera is provided. Six species are new records for Argentina and an additional seven species represent new records for provinces.
Raupach, Michael J.