• Title/Summary/Keyword: Thrips palmi

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Evaluation of effectiveness and bioassay of insecticide residues of chlorfenapyr(ac303 630) against Thrips palmi Karny(Thysanoptera ; Thripidae) under laboratory and vinyl house conditions (오이총채벌레에 대한 클로르페나피르(AC303 630) 약효와 약효지속기간)

  • Park, Jong-Dae;Lee, Ho-Bum;Kim, Do-Ik;Kim, Seon-Gon;Song, Seong-Do
    • The Korean Journal of Pesticide Science
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    • v.3 no.2
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    • pp.69-73
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    • 1999
  • The insecticidal activities and residues of chlorfenapyr [4-bromo-2-(4-chlorophenyl)-1-ethoxymethyl-5-trifluorornethyl pyrrole-3-carbonitrile] against Thrips palmi was evaluated under laboratory and vinyl house conditions. Effectiveness of chlorfenapyr against T. palmi on red pepper leaves was lasted for 9 days at a concentration of 50 ppm but there was no significant differences between emulsifiable concentration and wettable granule under laboratory conditions. In vinyl house, high toxicity was investigated at 6 hours after application of chlorfenapyr in a concentration of 50 and 100 ppm and insecticidal effect was maintained for 11days after 2 times weekly application in cucumber. Control effect was above 97% against T. palmi larva and larva+adults after 2 times weekly application in vinyl house.

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Biological Control of Thrips with Orius strigicollis (Poppius) (Hemiptera:Anthocoridae) and Amblyseius cucumeris (Oudemans) (Acari:Phytoseiidae) on Greenhouse Green pepper, Sweet pepper and Cucumber (시설작물에서 으뜸애꽃노린재(Orius strigicollis)와 오이이리응애(Amblyseius cucumeris)에 의한 총채벌레 밀도억제 효과)

  • Kim Jeong-Hwan;Byeon Young-Woong;Kim Yong-Heon;Park Chang-Gyu
    • Korean journal of applied entomology
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    • v.45 no.1 s.142
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    • pp.1-7
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    • 2006
  • Effectiveness of Orius strigicollis (Poppius) and Amblyseius cucumeris (Oudemans) as natural enemies against thrips were evaluated on greenhouse green pepper, sweet pepper and cucumber respectively. Control efficacy was calculated by the formula, $(D_{control}-D_{treatment})/D_{control}{\times}100$, where $D_{control}$ is the average density of thrips on the plots in which any natural enemy was not released and $D_{treatment}$ is the average density of thrips on the plots in which natural enemies were released respectively. As a result, control efficacies of O. strigicollis against Frankliniella occidentalis (Pergande) on green pepper and sweet pepper were $14.3{\sim}99.5%$ and $21.6{\sim}98.3%$, respectively. In addition, control efficacy of it against Thrips palmi Kany on cucumber was 61.2-74.4%. Control efficacies of A. cucumeris against F. occidentalis on green pepper and sweet pepper were $12.9{\sim}38.3%$ and $17.1{\sim}87.0%$, respectively. Control efficacy of it against T. palmi on cucumber was $90.4{\sim}97.4%$. Field evaluation showed that the prompt applications of natural enemies were effective to reduce the density of thrips. In detail, to control F. occidentalis effectively on green pepper and sweet pepper in spring season, five to six individuals of O. strigicollis per crops should be released three to six times continuously. To control T. palmi effectively on cucumber in autumn, more than 100 individuals of A. cucumeris per crop should be released four times repeatedly.

Selection of Entomopathogenic Fungus Isaria javanica FT333 for Dual Control of Thrips and Anthracnose (총채벌레 및 고추탄저병의 동시 방제를 위한 곤충병원성 곰팡이 Isaria javanica FT333 선발)

  • Lee, Moran;Jeong, Hyeju;Kim, Jaeyoon;Kim, Dayeon;Ahn, Seung Ho;Lee, SangYeob;Han, Ji Hee
    • The Korean Journal of Mycology
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    • v.46 no.4
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    • pp.479-490
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    • 2018
  • Red pepper is seriously damaged by thrips (Thrips palmi) and anthracnose caused by Colletotrichum acutatum throughout its development. Because of biotic constraints, producers often depend on chemicals that are expensive and have adverse effects on the environment, operator, and beneficial insects. In addition, resistance is developed because of the repeated use of chemicals. In recent decades, the use of microorganisms in crop protection has become a credible alternative because it is eco-friendly. In this study, we aimed to select isolates with insecticidal and fungicidal activities against the pathogens that cause anthracnose and thrips. We treated T. palmi adults and juveniles with 13 strains of entomopathogenic fungi (isolated from the soil by using the insect-bait method), and 6 strains showed excellent insecticidal activity (70-100%) 5 days after the treatment. The selected isolates were cultured with C. acutatum to screen for the strain with excellent anti-fungal activities, among which an isolate FT333 showed more than 95% control efficacy against C. acutatum in vitro. The isolate was identified as Isaria javanica through its morphological characteristics and phylogenetic analysis of the ITS and ${\beta}-tubulin$ nucleotide sequences. The Isaria javanica FT333 isolate could be used effectively for dual bio-control of thrips and anthracnose during red pepper cultivation.

Monitoring on Insecticide Resistance of Major Insect Pests in Plastic House (시설 재배 작물 주요 해충에 대한 약제저항성 모니터링)

  • Choi, Byeong-Ryeol;Park, Hyung-Man;Yoo, Jai-Ki;Kim, Sun-Gon;Baik, Chai-Hun;Lee, Si-Woo
    • The Korean Journal of Pesticide Science
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    • v.9 no.4
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    • pp.380-390
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    • 2005
  • This study was carried out for looking into the status of susceptibility of vinyl house insect pests to insecticides. The Thrips (Thrips palmi and Frankliniela occidentalis), Mites (Tetranychus urticae), Aphids (Aphis gossypii) and Whitefly (Trialeurodes vaporariorum) were captured at various areas where the host crop was being cultivated and the susceptibility level of each pest insect was investigated. The susceptibility of each pest insect varied by insect species and areas where they were caught. The tested insecticides showed good control effect to palm thrips in 2000, but in 2003 showed decrease of effect to them. Western flower thrips showed low susceptibility to neonicotinoids, imidacloprid and thiamethoxam, but high to chlorfenapyr, spinosad, emamectinbenzoate and fipronil. Antibiotic insecticides, abamectin and milbemectin, and chlorfenapyr were very effective on mite control and dicofol still had good effectiveness to it despite of long year use. No aphid species showed resistance to pyrethroid and carbamate insecticides. Relatively new insecticides such as imidacloprid, spinosad, pymetrozine were effective to whitefly, but not were organophosphates, carbamates and pyrethroids.

Pest Lists and Their Damages on Mango, Dragon Fruit and Atemoya in Jeju, Korea (제주도에서 재배되는 망고, 용과, 아떼모야의 주요 해충과 피해)

  • Choi, Kyung San;Yang, Jin Young;Park, Young Mi;Kim, Sora;Choi, Hwalran;Lyu, Dongpyo;Kim, Dong-Soon
    • Korean journal of applied entomology
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    • v.52 no.1
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    • pp.45-51
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    • 2013
  • Tropical plants of mango(Mangefera indica), dragon fruit(Hylocereus undatus), and atemoya(Annona cherimola ${\times}$ A. squamosa) are cultivated in Jeju, Korea. A pest survey on those tropical fruits was conducted from 2008 to 2011. Major pests of Mango were thrips, aphid, mealybug, and lepidoptera species. Thrips palmi and Scirtothrips dorsalis were the most important pests in mango fields. T. palmi mainly injured the leaf but S. dorsalis injured the leaf and fruit. Lepidoptera mango pests injured leaves but some larva of Adoxophyes honmai injured fruit surface around the stem. Aphid pests, Aphis gossypii and Myzus persicae, injured the shoots and Pseudococcus kraunhiae occurred on the stem and fruit. Ant species, A. gossypii, and S. litura, were important pests on dragon fruit. Ants and aphid occurred and injured the stem, flower, and fruit. Spodoptera litura larva severely injured the stem. Among the atemoya pests, S. litura and Homona magnanima caused severe damage.

Occurrence of Thrips in Greenhouse Cucumber and Insecticidal Activity of Five Local Western Flower Thrips Populations (시설오이에서 총채벌레류 발생소장 및 5 지역계통 꽃노랑총채벌레의 약제반응)

  • Jeong, In-Hong;Park, Bueyong;Park, Se-Keun;Lee, Sang-Bum;Jeon, Sung-Wook
    • Korean Journal of Environmental Biology
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    • v.36 no.4
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    • pp.517-524
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    • 2018
  • The purpose of this study was to investigate the density of thrips, and insecticidal resistance for effective control of Western flower thrips in greenhouse. The presence and density of the thrips was investigated using yellow colored-sticky trap in a cucumber field from May to August in Cheon-an. The results of the investigation revealed the existence of the following thrips species; Frankliniella occidentalis, F. intonsa, Thrips palmi, T. tabaci, Scirtothrips dorsalis, Microcephalothrips abdominalis, and T. nigropilosus. The predominant pest was found to be the western flower thrips. To survey the western flower thrips insecticidal resistance, we established the discriminating concentration (DC), recommended concentration (RC) and $2{\times}$recommended concentration ($2{\times}RC$) of nine insecticides; Emamectin benzoate EC, spinetoram SC, Chlorfenapyr EC, Spinosad SC, Cyantraniliprole EC, Acetamiprid WP, Dinotefuran WG, thiacloprid SC and thiamethoxam SC. The bioassay of about five local populations was conducted using the leaf-dipping method. In all local populations, insecticidal resistance in western flower thrips had not developed in emamectin benzoate EC (RC, $10.8{\mu}L\;L^{-1}$), chlorfenapyr EC (RC, $50.0{\mu}L\;L^{-1}$), spinetoram SC (RC, $25.0mg\;L^{-1}$), and spinosad SC (RC, $50.0mg\;L^{-1}$). However, insecticidal resistance in RC was found to have developed in cyantraniliprole EC (RC, $50.0{\mu}L\;L^{-1}$) and four insecticides of neonicotinoid type. Insecticidal activity of 95% or more was observed in each population when cyantraniliprole EC tested in $2{\times}RC$. However, the neonicotinoid types showed different insecticidal activity in $2{\times}RC$.

A New Disinfestation Approach Against Some Greenhouse Pests Using Ethyl Formate Fumigation (훈증제 에틸포메이트를 이용한 몇 가지 시설하우스 해충에 대한 새로운 방제 전략)

  • Kwon, Tae-Hyung;Jeong, In-Hong;Lee, Byung-Ho;Park, Chung Gyoo
    • Korean journal of applied entomology
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    • v.58 no.4
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    • pp.341-345
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    • 2019
  • Ethyl formate (EF) is a rapid kill, environmentally safe, and low mammalian toxicity fumigant, registered to disinfest quarantine insect pests from imported agricultural products. A new concept for controlling insect pests of agricultural crops was tested in a fumigation chamber with EF. Control efficacy of and phyto-toxicity due to EF fumigation were evaluated against four pests (Thrips palmi, Bemisia tabaci, Myzus persicae, and Tetranychus urticae) and on seedlings of four fruit vegetables (FVs; yellow melon, cucumber, tomato, and pepper). Ethyl formate fumigation at a dose of 1.5 g m-3 for 12 h produced >93.3% mortality in T. palmi, B. tabaci, and M. persicae. However, T. urticae was tolerant to fumigation, showing only 20% mortality at 2.0 g m-3. In terms of concentration × time (CT) products, at least 8.9 g·h m-3 CT at 20 ± 1.5℃ was needed to achieve > 90% mortality against the three susceptible insect pests. Fumigation at 1.5 g m-3 for 12 h caused no phyto-toxicity to any of the four FV seedlings. Ethyl formate application, as a new disinfestation method in greenhouses, could be an alternative to reduce the use of conventional insecticides. However, further studies are needed to determine the efficacy of this method at different pest developmental stages and in different greenhouse environments. Additionally, research is needed to elucidate the phyto-toxicity of EF application at different growing stages of a wide variety of crops.

Enhancement of insecticidal efficacy of acetamiprid soluble concentrates using different adjuvants (서로 다른 보조제에 의한 acetamiprid 액제의 살충활성 증진효과)

  • Kim, Hyeong-Min;Lee, Weon-Kee;Kim, Jong-Kwan;Lee, Chang-Hyuk;Yu, Yong-Man;Hwang, In-Cheon
    • The Korean Journal of Pesticide Science
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    • v.8 no.4
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    • pp.325-331
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    • 2004
  • The studies were undertaken to establish optimum formulation recipes of acetamipid 4% SL(soluble concentrate) using different adjuvants and to evaluate enhanced control effect on target insect pests by adjuvants. Adjuvants for the studies used were SS(Sodium alkylcarboxylate) and PE(Polyoxyethylene alkyl ether). After the fundamental recipe for SL being established by using co-solvent for stability at low temperature, four types of SL were formulated. The physical properties and insecticidal efficacies of the tested SL formulations were investigated. Surface tension of SL1 without adjuvant was highly decreased from 44 dyne/cm to 34 dyne/cm by addition of adjuvants. SL4 using mixed adjuvant showed the lowest contact angle. Efficacies of SL1 without adjuvant against the palm thrips (Thrips palmi) and the cotton aphid (Aphis gossypii) on cucumber were increased by adding adjuvants. SL4 using mixed adjuvant showed higher efficacy than SL2 and SL3 using single adjuvant. These results have demonstrated that the selected adjuvants could be used to enhance insecticide efficacy and reduce spray dose of insecticide.