• Title, Summary, Keyword: diamondback moth

Search Result 94, Processing Time 0.032 seconds

Larvicidal Activity of Constituents Identified in Piper nigrum L. Fruit Against the Diamondback moth, Plutella xylostella (후추 열매 유래 화합물들의 배추좀나방 유충에 대한 살충 활성)

  • Park, Il-Kwon
    • Korean journal of applied entomology
    • /
    • v.51 no.2
    • /
    • pp.149-152
    • /
    • 2012
  • The larvicidal activities of Piper nigrum fruit methanol extracts and its constituents against larvae of the diamondback moth, Plutella xylostella, were investigated using the leaf dipping method. Administering the P. nigrum methanol extract resulted in 100 and 97% mortality against diamondback moth larvae at 5.0 and 2.5 mg/mL concentrations, respectively. Larvicidal activities of the P. nigrum fruit-derived piperidine alkaloids, piperine, and N-isobutylamide, as well as pellitorine, guineensine, pipercide, and retrofractamide A against P. xylostella varied according to test compound. Based on the 48 h $LC_{50}$ values, the most toxic compound to diamondback moth larvae was guineensine (0.013 mg/mL) followed by retrofractamide A (0.020mg/mL), pipercide (0.033mg/mL), and pellitorine (0.046 mg/mL). The $LC_{50}$ value of piperine was >0.5 mg/mL.

Resistance of Diamondback Moth(Plutella xylostella L.: Yponomeutidae: Lepidoptera) against Bacillus thuringiensis Berliner (BT제에 대한 배추좀나방의 약제저항성)

  • 송승석
    • Korean journal of applied entomology
    • /
    • v.30 no.4
    • /
    • pp.291-293
    • /
    • 1991
  • Inter-regional difference in median lethal concentration of Bacillus thuringiensis diamondback moth was disclosed to be high. Pyungchang strain showed at most 41 times resistance compared to KN-IA strain of which $LC_{50}$ value was 5.5 ppm. and Oksan strain Showed 11 times resistance. The JMC strain, susceptible to pyrethroids, also showed 12 times resistance against B.T., suggesting difference in resistance mechanism between pyrethroid and B.t.

  • PDF

Economic Threshold for the Diamondback Moth (Plutella xylostella L., Lepidoptera: Plutellidae) on Leaf Broccoli (Brassica oleracea var. botrytis italiana) (잎브로콜리에서 배추좀나방 요방제 수준 설정)

  • Choi, Seon Wu;Lim, Ju Rak;Kim, Ju-Hee;Lee, Gong-Jun;Moon, Young-Hun;Cheong, Seong-Soo;Lee, Gi-Kwon
    • Korean journal of applied entomology
    • /
    • v.54 no.1
    • /
    • pp.1-6
    • /
    • 2015
  • This study was conducted to estimate the economic injury level (EIL) to leaf broccoli (leaf vegetable) by the diamondback moth (Plutella xylostella L.) in 2007 and obtain basic data for pest management. To investigate the relationship between initial density of diamondback moth larvae and broccoli leaf yield, experimental plots with five treatments (0, 0.5, 1.0, 1.5 and 2.0 larvae per plant) as initial density were established. We inoculated larvae on cheesecloth covering to survey changes in larval density. When grown for consumption, leaves of broccoli are harvested in periods. High levels of larvae were associated with significant reductions in leaf yield. There were 0%, 15%, 35%, 42%, 44% yield reductions due to a density of 0, 0.5, 1.0, 1.5, 2.0 diamond back moth larvae per plant, respectively, 25 days after larva inoculation. The regression equation used to predict leaf yield based on the number of initial larvae per plant was y = 1636-394x($R^2=0.79^{***}$>). EIL of the diamondback moth on leaf broccoli was 2~3 larvae per 10 plants for a damage level of 5%. The economic threshold was 1~2 larvae per 10 plants. Thus, diamondback moth management should be initiated when 1~2 larvae appear on 10 plants.

Synthesis and Insecticidal Activities of N-Phosphinothioyl Carbofuran Derivatives (N-Phosphinothioyl carbofuran 유도체의 합성 및 살충 활성 검정)

  • Park, Hong-Ryeol;Kim, Song-Mun;Han, Dae-Sung;Hur, Jang-Hyun
    • The Korean Journal of Pesticide Science
    • /
    • v.4 no.3
    • /
    • pp.27-33
    • /
    • 2000
  • N-Dimethoxyphosphinothionyl carbofuran, PSC, has a high insecticidal activity and low mammalian toxicity. Ten N-phosphinothionyl carbofuran derivatives were synthesized and their insecticidal activities were determined against brown plant hopper (Nilaparvata lugens), green peach aphid (Myzus persicae), diamondback moth (Plutella xylostella), and two-spotted spider mite (Tetranychus urticae). Green peach aphid, diamondback mea and brown plant hopper were controlled over 90% by application of 125 ppm, 125 ppm, and 63 ppm, respectively, of carbosulfan. Two hundred and fifty ppm of newly synthesized compounds could control most of brown plant hopper and diamondback moth. Especially, insecticidal activities of compound 10 against brown plant hopper, diamondback moth, and green peach aphid were similar to those of carbosulfan. Our results show that the newly synthesized derivatives of NV-phosphinothionyl carbofuran have a similar insecticidal activity to carbosulfan.

  • PDF

Identification of natural insecticidal compound in medicinal plants against diamondback moth (약초(藥草) 중에 존재(存在)하는 배추좀나방에 대한 천연살충성(天然殺蟲性) 물질(物質)의 동정(同定))

  • Chun, Jae-Chul;Kim, Sung-Eun;Kim, Jin-Cheol;Cho, Kwang-Yun
    • The Korean Journal of Pesticide Science
    • /
    • v.3 no.1
    • /
    • pp.13-19
    • /
    • 1999
  • Insecticidal potentials of polar and non-polar tractions obtained from 84 medicinal plants were screened against five major agricultural insects. Based on the primary and secondary screening results, non-polar fraction of Atractylodes koreana Kitam. rhizomes was selected to isolate and identify an active compound effective to diamondback moth (Plutella xylostella L.) larvae. Counter-current distribution separation on the non-polar fraction and TLC and spectroscopic analyses (GC-MS and $^{1}H$- and $^{13}C$-NMR) revealed that molecular formula of the active compound was $C_{15}H_{22}O$ known as a sesquiterpenoid 4,11-selinadien-3-one (${\alpha}$-cyperone). However, ${\alpha}$-cyperone was not detected in the non-polar fractions that showed high insecticidal potential against the diamondback moth. Although ${\alpha}$-cyperone has been first identified from Cyperus rotundus, the compound did not occur in C. rotundus cultivated in Korea.

  • PDF

Development of Fenvalerate Resistance in the Diamondback Moth, Plutella xylostela Linne (Lepidoptera : Yponomeutidae) and its Cross Resistance (배추좀나방의 Fenvalerate에 대한 저항성 발달과 교차저항성)

  • 김길하;서영식;이준호;조광연
    • Korean journal of applied entomology
    • /
    • v.29 no.3
    • /
    • pp.194-200
    • /
    • 1990
  • The diamondback moth (Plutella xylostella L.) was selected over 24 generations with fenvalerate. The resulting resistant strain was tested to study development of insecticide resistance and cross resistance to some insecticides in the laboratory. Insecticide resistance of diamondback moth at the 24th generation devleoped 66.2 fold compared to the parent strain for fenvalerate. The fenvalerate selected strain exhibited 145 fold, a high level of cross resistance to deltamethrin, and also showed 17.4-45.0 fold cross resistance to alphamethrin, cypermethrin, fenvalerate, permethrin, and tetramethrin in the pyrethroid insecticides. The fenvalerate selected strain showed 2.5-4.3 fold, low cross resistance to diazinon, dichlorvos, EPN, BPMC, cabaryl, and methomyl. However, it did not show cross resistance to acephate, fenitrothion, phenthoate, and carbofuran.

  • PDF

Insecticidal Effect of Neem Cake Extracts on Cabbage Pests, Aphis gossypii and Pluetella xylostella

  • Lee. HoYong;Kim, Won-Rok;Min, Bong Hee
    • Korean Journal of Environmental Biology
    • /
    • v.22 no.4
    • /
    • pp.501-506
    • /
    • 2004
  • In organic agriculture, choose of effective and cheap bio-pesticide is very important. The authors developed an insecticidal extract from neem cake, waste of neem oil from kernel, and applied as a bio-pesticide. Bio-pesticide neem cake extracts experiment on cabbage pest was carried out at Wonju Agricultural Technology and Extension Center from 11 March to 30 May 2003. There were six treatments with three replications, using completely randomized design. Treatments involved three and six sprays of synthetic pyrethroid pesticide cypermethrin 10 EC at the dilution rate of 2.2 mL $L^{-1}$ of distilled water and four, five and six sprays of bio-pesticide neem at the dilution rate of 13.3 mL $L^{-1}$ of distilled water, and untreated control. For each treatment, designated sprayings were done at 7 days interval. Pre-spray data showed that the plants in all the experimental plots were already infested with aphid (Aphis gossypii), and diamondback moth (Pluetella xylostella). The results indicated that all neem pesticide treatments were more effective in insecticidal activity than the untreated control and the chemical treatments in controlling aphids and diamondback moth. Among the three neem treatments, there were no significant differences between them.

Genetic Analysis of Three Overwintering Diamondback Moth, Plutella xylostella (Linne), Populations in Korea (국내 세 지역의 배추좀나방(Plutella xylostella (Linne)) 월동집단에서 나타나는 유전변이 분석)

  • 김용균;박효찬;정명섭
    • Korean journal of applied entomology
    • /
    • v.40 no.3
    • /
    • pp.227-233
    • /
    • 2001
  • Four polymorphic allozymes were used for genetic analysis of overwintering populations of field diamondback moth, Plutella xylostella (Linne). Different allele frequencies were found among three local populations of Andong, Youngchon, and Yangsan in all loci. Two allozyme loci (acid phosphatase and phosphoglucomutase) showed significant deviation from Hardy-Weinberg equilibrium in allele frequencies among these populations. Estimated Nei's genetic distance varied from 0.0151 between Yangsan and Youngchon to 0.0877 between Andong and Youngchon. Compared with the previous genetic distances in this moth, a little higher genetic differentiation among these overwintering populations suggests that there would be a specific genetic bottleneck in each local population during overwintering period.

  • PDF

Role of general esterases in deltamethrin resistance mechanism of diamondback moth, Plutrlla xylostella L. (배추좀나방(Pulltella xylostella L.)의 deltamethrin 저항성 기작에 관한 에스테라제의 역할)

  • 김용균;장동걸
    • Korean journal of applied entomology
    • /
    • v.35 no.1
    • /
    • pp.74-79
    • /
    • 1996
  • General esterases were analysed quantitatively and qualitatively to see their role in deltamethrin resistance mechanisms of the diamondback moth, Plutella xylostella L. Selection with 0.1 g of deltamethrin in each generation induced the moth to decrease susceptibility to the insecticide and to increase esterase activities of the fourth instar larvae. Both characters were highly correlated so that the correlation coefficient (r) between LDSo @g) of deltamethrin and esterase activities (~M/min/pg) was 0.9918 (P=0.0082). Nondenaturing PAGE (6%) separated 17 esterase bands from the whole body extracts of the fourth instar larvae. Deltamethrin-selected populations had fewer esterase bands than had the unselected. Four esterase bands (E3, E4, Ell, and E13) were, however, specific to deltamethrin-selected populations.

  • PDF