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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Korean journal of applied entomology
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Journal DOI :
Korean Society of Applied Entomology
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Volume & Issues
Volume 39, Issue 4 - Dec 2000
Volume 39, Issue 3 - Oct 2000
Volume 39, Issue 2 - Aug 2000
Volume 39, Issue 1 - Apr 2000
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New Record of Pratylenchoides utahensis Baldwin, Luc & Bell (Tylenchida: Pratylenchidae) from Korea
Young-Eoun Choi ; Dong-Ro Choi ; Byeong-Young Park ;
Korean journal of applied entomology, volume 39, issue 1, 2000, Pages 1~4
Pratylenchoides utahensis Baldwin, Luc & Bell, 1983 is recorded for the first time from Korea. Morphological characteristics are described based on the specimens preserved in Nematology Laboratory, Entomology Division, National Institute of Agricultural Science and Technology; and Department of Agricultural Biology, Kyungpook National University.
Morphological Characteristics of Bemisia tabaci(Gennadius) (Homoptera: Aleyrodidae) and Discrimination of Their Biotypes in Korea by DNA Makers
Korean journal of applied entomology, volume 39, issue 1, 2000, Pages 5~12
The sweetpotato whiteflies, Bemisia tabaci(Gennadius), were found recently in Korea on Glycine max, Euphorbia pulcherrima, and Rosa hybrida. The biotype identity of Bemisia tabaci in Korea was determined by several DNA markers including the random amplified polymorphic DNAs, and restriction fragments length polymorphism of mitochondrial 12S and 16S rRNA genes. The electromorph profiles of DNA fragments from the rose(Jincheon) and poinsettia(Seoul) populations in Korea are both identical to those of B biotypes distributed in Australia, Israel, and Japan. The populations of B. tabaci collected on Glycine max, Ipomea batatas, and Perilla frutescens in different localities retained the same DNA markes with the population from Lonicera japonica and shikoku of Japan. These populations are non-B biotype and considered as an indigenous type in the Far Eastern Asia Region including Korea and Japan, Morphological Characteristics of B. Tabaci were also observed by the scanning electron microscope and described with the comparison to the other important whitefly pest, Trialeurodes vaporariorum (Westwood).
Natural Enemies of Citrus Red Mite, Panonychus citri McGREGOR, and Seasonal Occurrence of Major Predators on Yuzu tree (Citrus Junos)
Korean journal of applied entomology, volume 39, issue 1, 2000, Pages 13~19
This studies was carried out to investigate the natural enemies of citrus red mite, pononychus citri and seasonal occurrence of its major beneficial insects in Yuzu groves (Chonnam province) from 1996 to 1998. Natural enemies against citrus red mite were 9 species including Oligota kashmirica benifica, 0. yasumatsui, Stethorus punctillum, Chrysopa pallens, Propylea japonica, Orius sauteri, Scolothrips takahashii, Amblyseius womersleyi and one unidentified species of thrips (Family: Phlaeothripidae). Among them, Oligota kashmirica benzficu and Stethorus punctillum were found to be dominant species. 0 . kushmirica henifica had 4-5 generations from middle May to middle November with peak in early September. S. punctillum had 3 generations from late May to late October with peak of late June to middle July. Population dynamics between predator ( 0 . kushmiricu benifica and S. punctillum) and prey (Panonychus citri) were quite well synchronized until September but predator density was decreased abruptly after October.
Effects of Temperature on the Development of Delia platura(Diptera: Anthomyiidae)
Korean journal of applied entomology, volume 39, issue 1, 2000, Pages 21~24
These studies were conducted to investigate the effect of temperature on the developmentof Delia platura (Meigen) under a laboratory condition at five different temperatures. The developmentalperiods of D. platurcr from egg to adult emcrgence at the temperatures of 11, 15, 19, 23, and 27
C were67.8k 14.5, 43.7t-9.4, 31.2-t-7.0, 22.4k4.9, and 18.3k4.1 days, respectively. Based on these results,threshold temperature of development and effective cumulative degree-day (DD) for overall developmentwas 0.6"C and 579.8 DD, respectively. Generation of time D. pluturci averaged 30.8 days, and meannumber of eggs produced per female was 246.5 k 16.9 at 23
C. Hatching rate and emergence rate curvesin relation to the temperature was dome shaped with the peak of 90.0 and 85.2% at 23"C, it wassuggesting that hatching and emergence were inhibited by high temperature above that temperature.Pupation rate of the insect reared on garlic and on onion were higher than those reared on other diets.Oviposition of D. platum usually began 7-9 days after emergence at 23
C. Females laid about 3-4 eggsin a day. Oviposition of the females peaked at the age of 12- 18 days after emergence. of 12- 18 days after emergence.
Descriptions of Immature and Adult Stages of Hydropsyche orientalis Martynov(Trichoptera, Hydropsychidae) with Ecological Notes
Korean journal of applied entomology, volume 39, issue 1, 2000, Pages 25~29
Immature and adult stages of Hydropsyche orientalis Martynov, previously known as Hydropsyche KUe in Korea, were associated based on field observations and rearing experiments. Its larval instars, larval retreat, pupa, pupal case, and male and female adults were described and its ecological notes were provided.
Community Analysis of Oribatid Mites(Acari: Oribatida) in Namsan and Kwangreung Coniferous Forests
Korean journal of applied entomology, volume 39, issue 1, 2000, Pages 31~41
Community analysis of oribatid mites was conducted in Namsan and Kwangreung coniferous forests which have been received by different degrees of environmental pressures through urbanization processes. Oribatid mites were sampled in the litter and soil layer of study sites from May 1993 to October 1994. Although two sites have been under similar weather condition, seasonal changes in oribatid mites density did not show a synchronized pattern. Density in spring and summer showed stable pattern with low fluctuations, but unstable pattern in autumn between 1993 and 1994. And these patterns were highly correlated with precipitation. The density and species number were higher in the litter layer than in the soil layer and showed no typical seasonal changes. The dominant species were Scheloribates latipes (1 l.78%), Pergalumna altera (8.92%), Eohypochthonius crassisetiger (7.58%), Scheloribates sp. (6.89%) and Suctobelbella yezoensis (5.04%) in Namsan, and Ceratozetes japonicus (25.72%), Punctoribates punctum (14.15%), Trichogalumna nipponica (10.96%) and Ramusella sengbuschi (5.08%) in Kwangreung. The number of species with high constany were 10 and 18 in Namsan and Kwangreung, respectively. Namsan showed the feature of urban forests. In analysis of species diversity, species richness was significantly higher in Kwangreung than in Namsan, while shannon (H') and evenness index (J') were higher in Namsan than in Kwangreung. The values of shannon index (H') in Namsan and Kwangreugn were 2.83 and 2.62, respectively and evenness index (J') were 0.78 and 0.67, respectively. The value of similarity index between two sites was 0.68.
Haplotype Diversity and Gene Flow of the Diamondback Moth, Plutella xylostella(L.) (Lepidoptera: Yponomeutidae), in Korea
Korean journal of applied entomology, volume 39, issue 1, 2000, Pages 43~52
A portion of mitochondria1 COI gene (438 bp) was sequenced from the sampls of Plutella xylostella from four localities in Korea to investigate the population genetic structure and characteristics by measuring the magnitude of genetic diversity and the degree of gene flow among populations. Thirteen haplotypes ranging in nucleotide divergence 0.3% to 1.4%, were obtained from 21 individuals. The nucleotide divergence was similar to the other related studies, but haplotype diversity was substantially higher (mean h = 0.81). The genetic distance among geographically remote Cheju Island population and the two Kimhae populations, distant 1 lkm to each other, was not statistically significant (p<0.05). Instead, a substantial or high female gene flow was detected (Nm = 2-30). One Hawaiian haplotype of the diamondback moth obtained through GenBank search also was genetically similar to the ones obtained from this study. Collectively, the genetic population structure of the diamondback moth in Korea can be characterized into two aspects. First, the diamondback moths in Korea possesses overall moderate genetic divergence based on a high number of haplotypes. Second, a high haplotype diversity within each population due to the long distance dispersal with a substantial dispersal power and the resultant genetic similarity among geographic populations is characteristic.
Relative Toxicity of NeemAzal-T/S to the Predacious Mite, Amblyseius womersleyi(Acari: Phytoseiidae) and the Twospotted Spider Mite, Tetranychus urticae(Acari: Tetranychidae)
Korean journal of applied entomology, volume 39, issue 1, 2000, Pages 53~58
The effect of NeemAzal-T/S was tested by leaf disk method on fecundity, egg mortality, and preference of twospotted spider mite, Tetranychus urticae and its predator mite, Amblyseius womersleyi in the laboratory. Mortalities of T. urticae and A. womersleyi adults were 97.7% and 20.0%, in 100ppm treatment at 72 h after application, respectively. The mean number of eggs laid per T. urticae female adult were 0.0 and 18.5, and those of A. womersleyi were 1.6 and 2.9 at 100 ppm and 0 ppm concentrations, respectively. Hatchability of T. urticae eggs treated with 50 and 100 ppm were 52.8%, and 2.5%, respectively, and those of A. womersleyi eggs were 100% and 91.3%, respectively. Choice and no-choice tests revealed that T. urticae female preferred to alight and oviposit on untreated bean leaf disk with 13.8 to 18.2 eggs per female. In contrast, A. womersleyi female preferred on treated or untreated bean leaf equally. There was no significant differences in the number of consumption of T. urticae eggs by A. womersleyi on treated and untreated bean leaves, except 200 ppm. These results indicate that NeemAzal-TIS is highly toxic to T. urticae, and is less toxic to A. womersleyi. It may be concluded with these results that NeemAzal-T/S could be incorporated into integrated T. urticae management system.