• Title, Summary, Keyword: Trialeurodes vaporariorum

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Selection of a Highly Virulent Verticillium lecanii Strain Against Trialeurodes vaporariorum at Various Temperatures

  • Lee, Min-Ho;Yoon, Cheol-Sik;Yun, Tae-Yu;Kim, Hong-Sun;Yoo, Jai-Ki
    • Journal of Microbiology and Biotechnology
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    • v.12 no.1
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    • pp.145-148
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    • 2002
  • The virulence of five Verticillium lecanii strains against greenhouse whiteflies, Trialeurodes vaporariorum, was tested at various temperatures as a major environmental factor. Strain CS-626 was found to be the most durable strain at a broad temperature range, and highly virulent against greenhouse whiteflies in a detached-leaf bioassay. In a tomato plant pot experiment, the $LT_{50}\;and\;LC_{50}$ of the CS-626 strain were 6.2 days and $2.3{\times}10^6$ conidia/ml, respectively. The optimal concentration of CS-626 for successful infection was $1{\times}10^8$conidia/ml. These results indicate that the CS-626 strain of Verticillium lecanii has a strong potential for effectively controlling greenhouse whiteflies.

Occurrence and Within -Plant Distribution of Trialeurodes vaporariorum (Westwood)and Encarsia formosa (Gahan) in Greenhouse (시설내 온실가루이와 온실가루이좀벌의 발생 및 주내분석)

  • Park, Jong-Dae;Kim, Do-Ik;Park, Ung
    • Korean journal of applied entomology
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    • v.37 no.2
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    • pp.117-121
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    • 1998
  • This experiment was conducted to investigate host preference, occurrence and intraplant distribution of Trialeurodes vaporariorum (Westwood) and Encarsia formosa (Gahan) in greenhouse. T vaporariorum preferred cucumber over tomamto. 7: vaporariorum adults distributed at upper part of cucumber plant. Nymphs also distributed at upper part in early growing stage of cucumber but became to distribute lower part after 40 days. E. formosa adults were found mainly at mid-upper part of plant but there was no significant difference in statistics all analysis among each parts and also mummy distributed mid-low part. E. formosa were released when five ir: vaporariorum were caught by yellow sticky trap per week in glasshouse. The treatment of one tag (50 mummies) of E. formosa per five plants controlled successfully the 7: vaporariorum population after 40 days.

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Test of Insecticidal Efficacy of Some Commercial Natural Products against Trialeurodes vaporariorum(Homoptera : Aleyrodidae), Bemisia tabaci(Homoptera : Aleyrodidae), and Spodoptera litura(Lepidoptera : Noctuidae)

  • Jeong, Hyung-Uk;Kim, Man-Il;Chang, Sung-Kwon;Oh, Hyung-Keun;Kim, Ik-Soo
    • International Journal of Industrial Entomology
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    • v.18 no.2
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    • pp.105-112
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    • 2009
  • The greenhouse whitefly, Trialeurodes vaporariorum (Westwood) and the sweet potato whitefly, Bemisia tabaci (Gennadius) are serious insect pests that have a wide host range including cucumber, tomato, and pepper. In this study, we tested larvicidal efficacy of several on-the-market environment-friendly agricultural materials (EFAM) to select the effective products after the target pests were stabilized in indoor rearing condition. The developmental periods of two whiteflies are as follows: in the case of T. vaporariorum, egg duration is 9.6 days and nymph is 18.9 days, and in the case of B. tabaci, egg duration is 7.4 days and nymph is 15.2 days under $25^{\circ}C$ with relative humidity (RH) of $60{\pm}5%$ and a photoperiod of 16 L:8D. The total period of T. vaporariorum was 5 days longer than B. tabaci. Among 22 EFAMs six products showed more than 60% of insecticide efficacy against T. vaporariorum BTV B, BTV D, BTV G, BTV L, BTV M, and BTV S. On the other hand, seven EFAM products showed over 60% of insecticide efficacy against B. tabaci BTV D, BTV G, BTV K, BTV L, BTV M, BTV N, and BTV U. In the case of Spodptera litura previously, 16 EFAMs were tested against $2^{nd}$ instar S. litura, and six EFAMs were found to have more than 90% efficacy. Test of these six EFAMs against entire larval stages were performed in this study. Although some of these products showed still more than 90% of insecticidal efficacy against up to $3^{rd}$ instar larvae, the efficacy of these EFAMs sharply decreased as ages increase, resulting in less than 60% of efficacy of the products at most. This result indicates the difficulty to control S. litura with the on-the-market EFAMs alone under economic injury level. Collectively, it is required to find more EFAMs, and find alternative method, and combined way of controlling to control those insect pests tested in this study.

Effect of Paecilomyces fumosoroseus SFP-198 on greenhouse whitefly, Trialeurodes vaporariorum in greenhouse (Paecilomyces fumosoroseus SFP-198의 온실가루이(Trialeurodes vaporariorum)에 대한 살충성 검정과 온실에서의 방제 효과)

  • Shim, Hee-Jin;Kim, Soon-Kee;Yang, Ziwen;Je, Yeon-Ho;Kang, Seok-Kwon
    • The Korean Journal of Pesticide Science
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    • v.3 no.1
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    • pp.90-95
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    • 1999
  • For the control of the greenhouse whitefly, Trialeurodes vaporariorum entomopathogenic fungi were isolated from forest soils and infected insects. We selected three strains, which showed high pathogenicity and named as SFB-582(Beauveria sp.), SFP-198(Paecilomyces fumosoroseus) and SFV-1053(Verticillium sp.) respectively. Particularly, at the concentration of $10^{7}$ conidia/ml, P. fumosoroseus SFP-198 had the highest pathogenicity, $91.4{\pm}3.5%$ in laboratory. In glasshouse application, $91.4{\pm}3.5%$ SFP-198 showed high protective values($80{\sim}90%$) regardless of developmental stages, which were similar with that of Verticillium lecanii F-903 already reported. Four kinds of formulations of entomopathogenic fungi were developed, formulation with surfactant Silwet L-77 gave best control of greenhouse whitefly(over 90%). These results suggest that P. fumosoroseus SFP-198 is a promising candidate as a microbial pesticide for the control of T. vaporariorum.

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Susceptibility of greenhouse whitefly, Trialeurodes vaporariorum (Homoptera: Aleyrodidae) against commercially registered insecticides in Korea (국내등록사용중인 살충제에 대한 온실가루이의 감수성)

  • Kim, Chang-Woo;Kim, Jeong-Wha;Kim, Gil-Hah
    • The Korean Journal of Pesticide Science
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    • v.4 no.3
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    • pp.75-81
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    • 2000
  • These studies were carried out to investigate the toxicities of 38 registered insecticides to the sweetpotato whitefly (Trialeurodes vaporariorum). Insecticide activities were evaluated by testing systemic action and residual effect in the laboratory, and control efficacy in the greenhouse. All experiments were tested at the recommended concentration(ppm) of each insecticides. Insect growth regulators (IGRs), only pyriproxyfen showed over 90% of ovicidal effect. The insecticides that showed over 90% of larvicidal activity oil 3rd nymphal instars were abamectin, acetamiprid, chlorpyrifos-methyl, imidacloprid, pyripoxyfen, and acetamiprid+ethofenprox. Insecticides with 100% adulticidal activity were abamectin, acephate, acetamiprid, benfurcarb, bifenthrin, furathiocarb, endosulfan, fenitrothion, imidacloprid, phenthoate, pymetrozine, acetamiprid + ethofenprox, ethofenprox + diazinon, furathiocarb + difluberlzuron, and triazamate+${\alpha}$-cypermethrin. Abamectin, acetamiprid, imidacloprid, pyriproxyfen, and acetamiprid + ethofenpox showed both residual effect and systemic activity. In tile control efficacy test on B. tabaci, 90% control values were obtained at 11th day after treatment of the insecticides including abamectin, acetamiprid, imidacloprid, pyripoxyfen and acetamiprid + ethofenprox. These results indicate that abamectin, acetamiprid, imidacloprid, pyriproxyfen and acetamiprid + ethofenprox can be used for tile control of B. tabaci in field.

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Insecticidal Activity of Paecilomyces fumosoroseus SFP-198 as a Multi-Targeting Biological Control Agent against The Greenhouse Whitefly and The Two-Spotted Spider Mite

  • Kim, Jae-Su;Roh, Jong-Yul;Choi, Jae-Young;Shin, Sang-Chul;Jeon, Mun-Jang;Je, Yeon-Ho
    • International Journal of Industrial Entomology
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    • v.17 no.2
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    • pp.181-187
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    • 2008
  • An entomopathogenic fungus, Paecilomyces fumosoroceus SFP-198 was isolated in Kyungbuk province, Korea and screened out for the control of Trialeurodes vaporariorum nymphs. It showed 72.5% efficacy against second instars of T. vaporariorum nymphs at 6 days after treatment in the laboratory. To select an active ingredient for the mass production and the formulation, SFP-198 culture products were compared based on their insecticidal activities against T. vaporariorum nymphs. Among them, conidia and blastospores showed much higher insecticidal activity than supernatants. Furthermore, SFP-198 conidia were more heat-resistant than blastospores, and also powder form of conidia was more stable than their suspension form. SFP-198 conidia showed high pathogenicity on not only T. vaporariorum but also Tetranychus urticae in the glasshouse. This result suggested that SFP-198 conidia can be used as a multi-targeting biological control agent against sucking agri- cultural pests, such as whiteflies and mites.

Management of Greenhouse Whitefly, $Trialeurodes$ $Vaporariorum$ (Homoptera : Aleyrodidae) with Zoophytophagous Predator $Nesidiocoris$ $tenuis$ (Heteroptera : Miridae) and EFAM in Tomato Production without Pesticides (무농약 토마토재배에서 친환경자재와 담배장님노린재를 이용한 온실가루이 방제)

  • Kim, Do-Ik;Ko, Sug-Ju;Choi, Duck-Soo;Kang, Beom-Ryong;Kim, Seon-Gon;Choi, Kyeong-Ju;Kim, Sang-Soo;Hwang, In-Cheon
    • Korean Journal of Organic Agriculture
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    • v.20 no.1
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    • pp.49-58
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    • 2012
  • Greenhouse whitefly, $Trialeurodes$ $Vaporariorum$, is the most important insect pest in environmental friendly tomato production. Natural enemies, $Nesidiocoris$ $tenuis$ and environmental friendly agricultural materials (EFAM) are major control agents in Korea. The aim of the present work is to evaluate release time of $N.$ $tenuis$ in controlling of $T.$ $vaporariorum$ and to select environmental friendly agricultural materials (EFAM) to suppress both $T.$ $vaporariorum$ and $N.$ $tenuis$ which if the density were high causing necrotic rings. Six EFAM selected to control of $Trialeurodes$ $Vaporariorum$ in three times spray with seven days intervals. Three EFAM showed high mortality 67.7-70.5% in spray after release plot but low in release after spray plot. It should be careful to spray with $N.$ $tenuis$. When $N.$ $tenuis$ were early release at 7 days after transplanting which before occurring and establishment of greenhouse whitefly, it could suppress the density. Extracts of bead tree + matrin, matrin 1, Chrysanthemum showed high mortality on $T.$ $vaporariorum$ adults and $N.$ $tenuis$. The results suggested that this three EFAM could be control agents of the damage of necrotic rings from $N.$ $tenuis$.

Transmission of Tomato leaf curl begomovirus by Two Different Species of Whitefly (Hemiptera: Aleyrodidae)

  • Hidayat, Sri Hendrastuti;Rahmayani, Enuna
    • The Plant Pathology Journal
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    • v.23 no.2
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    • pp.57-61
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    • 2007
  • Whitefly-transmitted geminiviruses (WTGs) are economically important pathogens causing serious damage on tomato and chilli pepper in Indonesia. Geminiviruses are readily transmitted by its insect vector, sweetpotato whitefly (Bemisia tabaci). However, greenhouse whitefly (Trialeurodes vaporariorum), another species of whitefly, is commonly found together with B. tabaci in the field. Incidence of yellow leaf curl disease in tomato and chilli pepper is probably correlated with the population of whitefly complex. It is becoming important to find the role of T. vaporariorum in the spread of the disease. Therefore, research is conducted to study the characteristic relationship between tomato leaf curl begomovirus (ToLCV) and two species of whitefly. The two species of whitefly, B. tabaci and T. vaporariorum, was capable to transmit ToLCV although it was evidenced that B. tabaci is more effective as insect vector of ToLCV in tomato and chilli pepper. A single B. tabaci was able to transmit ToLCV to tomato with a minimum acquisition and inoculation access period of 10 h. Transmission of ToLCV by T. vaporariorum required at least 10 insects per plant with a minimum acquisition and inoculation access period of 24 h. The transmission efficiency will increase with longer acquisition and inoculation access period of the insect and the higher number of insect per plant.

Effect of Yellow Sticky Trap for Controlling Whitefly on Tomato Cultivated in Greenhouse (온실재배 토마토에 발생하는 가루이류에 대한 황색점착트랩 방제효과)

  • Park, Jong-Ho;Hong, Sung-Jun;Han, Eun-Jung;Shim, Chang-Ki;Lee, Min-Ho;Kim, Min-Jeong;Kim, Yong-Ki
    • Korean Journal of Organic Agriculture
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    • v.20 no.4
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    • pp.643-654
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    • 2012
  • We conducted the experiment in order to evaluate the control effect of whitefly using the sticky trap. Both Bemisia tabaci and Trialeurodes vaporariorum were more attracted to yellow sticky trap than white or blue colored traps. When yellow sticky traps were installed in different height around tomato, catches of B. tabaci were not significantly different among the traps and catches of T. vaporariorum on the traps in the upper position were more than lower position. T. vaporariorum was more attracted to trap when host plant is smaller. The attracted number to yellow sticky traps were not significantly different between whiteflies (B. tabaci and T. vaporariorum) and their parasitoids (Encarsia formosa and Eretmocerus mundus). Yellow sticky trap reduced population density of both B. tabaci and T. vaporariorum by more than 80% on tomato nursery in a screen cage. Population density of whiteflies in greenhouse installed yellow sticky traps was less than one third of that in untreated greenhouse.

Greenhouse Whitefly and Thrips Management Model Using Natural Enemies in Semi-forcing Culture of Tomato (토마토 반촉성 시설 재배에서 천적중심 온실가루이와 총채벌레 관리모델)

  • Jeong, Tae-Sung;Hwang, Mi-Ran;Hwang, Se-Jung;Lee, Jae-Hong;Lee, An-Soo;Won, Heon-Seop;Hong, Dae-Ki;Cho, Jum-Rae;Ham, Eun Hye
    • Korean journal of applied entomology
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    • v.56 no.4
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    • pp.403-412
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    • 2017
  • To investigate the control effect of insect pests by natural enemies, sticky traps were used in commercial tomato greenhouses in Chun-cheon and the experiment fields of Gangwon-do Agricultural Research and Extension Services, Republic of Korea using semi-forcing culture (February to June). We selected low toxicity pesticides, environment-friendly agricultural materials (EFAM), and natural enemies of the study species, combinations of which have been previously used in farms to control insect pests. In this study, Trialeurodes vaporariorum and thrips, which are major agricultural insect pests, were studied in experimental greenhouses. The adult T. vaporariorum population was observed in mid-April and the population of thrips showed occurrences in early April. Regarding seasonal fluctuation, T. vaporariorum peaked in mid-May and thrips peaked after June. one insecticide, spiromesifen suspension concentrate (SC); one fungicide, cyazofamid SC; and two EFAMs containing neem tree extract were shown to be slightly toxic to Encarsia formosa and Orius laevigatus. The results of this study could be used to develop management models using natural enemies of control the insect pests; T. vaporariorum and thrips in semi-forcing culture of tomato.