• Journal of Life Science
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• v.29 no.2
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• pp.202-208
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• 2019

Brown planthopper (BPH), Nilaparvata lugens Stål (Hemiptera: Delphacidae), is one of the most important migratory pests damaging rice in Korea. It invades annually from tropical and subtropical areas via continental air streams. It is necessary to determine the resistance levels of rice varieties in order to control efficiency. The honeydew excretion, development, and reproduction of the migratory BPH were studied by region in a laboratory at $25{\pm}2^{\circ}C$ and $65{\pm}5%\;RH$ and a 16L: 8D photoperiodism conducted on three BPH resistant genes: Bph1, Bph2, and Bph18. The information obtained was reported using the jackknife method, and we created life table statistics accordingly. The feeding amount of Bph1 resistant gene was lower than that of resistant genes. The developmental periods of immature stages ranged from $13.7{\pm}0.10d$ on Bph2 (Namhae, 2015) to $18.5{\pm}1.06d$ on Bph2 (Sacheon, 2016). Reproductive period and female longevity were longest on the non-resistant genes, Bph2 and Bph18 (except 1980s), and the highest fecundity of N. lugens was observed on the two BPH resistant genes. Highest net reproductive rates ($R_0$) were calculated on Bph2 by region. Intrinsic rates of population increase ($r_m$) showed a difference in resistant genes by region. These population parameters showed that migratory regions and biological characteristics of N. lugens vary annually.

• Korean Journal of Environmental Biology
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• v.35 no.4
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• pp.526-532
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• 2017

Development, survival, and reproduction of brown planthopper (BPH) Nilaparvata lugens $St{\aa}l$ (Hemiptera: Delphacidae), were studied in laboratory at $25{\pm}2^{\circ}C$, $65{\pm}5%$ RH and a 16L : 8D hours photoperiodism on five rice cultivars of: Dongjin 1ho, Chungchungbyeo, Jangseongbyeo, Chinnongbyeo and Jungmo 1045. BPH nymphs successfully survived on all rice cultivars, although survival rate was lowest on Jangseongbyeo (36.0%). Developmental time of immature stages ranged from $11.7{\pm}0.59d$ on Jungmo 1045 to $12.8{\pm}0.59d$ on Chinnongbyeo. Reproductive period and female longevity were longest on Dongjin 1ho, Chinnongbyeo and Jungmo 1045 while highest fecundity of N. lugens being observed on these three rice cultivars. Highest and lowest net reproductive rates were calculated on rice cultivars, Jungmo 1045 and Jangseongbyeo, respectively. Mean generation time was the longest on rice cultivar Dongjin 1ho. Respective descending order of intrinsic rates of population increase were on Jungmo 1045, Chinnongbyeo, Dongjin 1ho, Chungchungbyeo and Jangseongbyeo. These population parameters showed that N. lugens can successfully survive and reproduce on Chinnongbyeo and Jungmo 1045.

• Korean journal of applied entomology
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• v.54 no.4
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• pp.419-423
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• 2015

Small brown planthopper (SBPH), Laodelphax striatellus, gives a lot of damage to the rice by insect vector of rice stripe virus (RSV). This study compared the RSV acquisition and infection rates according to wing form, sex, and life stage of SBPH. The RSV acquisition rate in macropterous and brachypterous was 60.7% and 63.1%, respectively. The RSV acquisition rate by sex was 61.9% in female and 52.2% in male. However, there was no difference in significance. The RSV acquisition rate of nymphs and adults was 51.2% and 58.7%, respectively. The RSV infection rate by wing form was 53.3.% in macropterous and 48.2% in brachypterous. According to life stage, nymphs was 38.2% and adults was 42.6%. There was no difference in significance. On the other hand, female and male of RSV infection rate was 50.5% and 22.3%, respectively. There was a significant difference. Additionally, developmental periods of SBPH by RSV infection, the longest when inoculated with RSV-infected SBPH in healthy rice, while the shortest when inoculated healthy SBPH in healthy rice.

• Korean journal of applied entomology
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• v.16 no.3 s.32
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• pp.155-161
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• 1977

During 1976 the effects of insecticide placement in the root zone of the rice plants were evaluated for control of rice insect pests in the screenhouse and in the paddy field at Suweon. The methods of insecticide placement included the use of encapsuled formulation and injection of liquid formulation. In screen house experiments, the root' zone placement of carbofuran was highly effective up to 30 days after treatment against the striped rice borers (Chilo sujppressalis) and up to 17 days after treatment against the small brown planthopper(Laodelphax xtriatellus) and the brown planthopper (Nilaparvata lugens), while the root-zone placement of omethoate and disyston were ineffective. In field experiments, the injection in every other row by the liquid applicator designed at IRRI was less effective for control of the striped "'rice borers and the small brown planthoppers than the caupsule placement. The single root·zone placement of liquid carbofuran, however, seemed to be equal in 'effectiveness to two broadcast applications of carbofuran and diazinon. In the plots treated at 5 days after transplanting, incidence of the dead hearts by the striped rice borers was much lower than in the plots treated at the 18 days after transplanting.

• The Korean Journal of Pesticide Science
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• v.6 no.4
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• pp.271-278
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• 2002

Methanol extracts from 420 samples of 173 plant species in 58 families were tested at 5000 ppm for their insecticidal and acaricidal activities against five economically important arthropod pests by spray method. The responses varied with arthropod pest species, plant species and plant tissue sampled. In a test with Nilaparvata lugens Stal, extracts from Zanthoxylum piperitum barks, Chamaecyparis obtusa leaf and Quercus salicina leaf showed potent insecticidal activity. With Plutella xylostella L., potent larvicidal activity was observed from extracts of Platycarya strobilacea wood, Meliosma myriantha barks, Sophora japonica leaf, Zanthoxylum piperitum barks, and Pinus thunbergii wood. Methanol extracts of Sophora japonica leaf and Zanthoxylum piperitum barks showed high insecticidal activity against Spodoptera litura. In a test with Tetranychus urticae Koch, extract from Carpinus coreana leaf, Firmiana simplex barks, Elaeagnus macrophylla leaf, Aralia elata leaf, Comus controversa barks and Chamaecyparis obtusa leaf exhibited strong acaricidal activity. As a naturally occurring pest control agent, Zanthoxylum piperitum barks could be useful as new insecticidal and acaricidal products against various arthropod pests.

• Agrochemical news magazine
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• v.19 no.1 s.142
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• pp.26-28
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• 1998

남미의 페루연안에서 적도에 이르는 태평양상의 수온이 2$\~$6년 주기로 올라가 세계 각지에 홍수, 가뭄, 폭설 등을 몰고 다닌다는 기상이변의 주범인 엘니뇨 현상은 과연 우리나라는 안전지대인가? 그렇다면 지난한해동안 논란이 계속돼온 엘니뇨 현상이 과연 올해에는 우리나라 농업에 어떤 영향을 미칠것인가는 모든이의 궁금 사하이 아닐 수 없다. 물론 기사이변을 예측하는데는 고도의 과학적 자료와 분석능력이 뒷따라야 하기 때문에 쉽게 접근할 수 없다는 어려움이 있다. 그러나 농림부는 그동안 각종 자료를 꾸준히 분석하여 엘니뇨 발생에 따른 병 해충 발생양상을 예견해 보고 이에 대비한 영농대책을 마련, 시행에 만전을 기하고 있다. 농림부는 어떤 예측을 하고있으며 그에 따른 대책은 무엇인가에 대해 알아본다.

• THE HEALTH and ORGANIC FARMING
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• no.230
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• pp.1-12
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• 2006

2006년도 지회장단 연찬회 성료/미국산 유전자조작 쌀 세계로 퍼저나가/우리의 산야초/연속 강우에 따른 과일나무 잎의 갈변에 대하여/벼 멀칭재배의 이론과 기술/06'대구.경북도지부 지회장단 연찬회/생활습관으로 노화를 최소화하라/철원지회,친환경농산물 가공센터 준공/고령.우곡지회,그린수박 선별장 준공/아이들건강과 먹을거리 패러다임의 전환/미국에서 친환경 상품 소비 증가세/미국 LA에 한국인 대상 유기농 마켓 등장/아마존 닷컴 유기농식품 판매에 손길/두가지 비료로 유기농작물의 고품질 다수확 생산을 체계적으로 보다 쉽게 하는 방법/경북,10년간 1조7천억 투입해 친환경농업 육성/벼희잎마름병의 방제는 이렇게/빛을 이용한 해충의 방제/유기농업연수원 매각 한 후 본회 사옥 신축/화성지역 인증자 후기관리교육 실시/국내외 친환경농축산물의 생산 및 인증실태/친환경 유기낙농의 정착 방안/8월중 새식구 명단/2006 지회장단 연찬회 이모저모/유기 및 일반 농산물의 품질 비교에 관한 연구/SK건설, 유기농 주말농장 무상대여 서비스/항공사들, 유기농식단 등으로/중국에도 웰빙바람, 유기농이뛴다/유기질비료의 이해

• THE HEALTH and ORGANIC FARMING
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• no.227
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• pp.1-12
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• 2006

6월 2일 "유기농업의" 날 선포식/뜨겁고 집중호우 많아지는 한반도/우리의 산야초/규산질비료에 대하여/친환경농업도지사 김태환 제주도지사 당선/당뇨병환자에게 알리는 희소식/손 씻기는 최고의 건강 지킴이/노화의 주범, 활성산소를 없애자/숫자로 보는 건강/아이들건강과 먹을거리 패러다임의 전환/아태 유기농업현황/두가지 비료로 유기농작물의 고품질 다수확 생산을 체계적으로 보다 쉽게 하는 방법/울산시,'친환경농업 실천 5개년 계획'확정/벼 육묘시 발생하는 병해들/시설내 병해의 생태와 방제/김제 청하 유기재배 배 단지/친환경농산물 전문인증기관 연수교육/국내외 친환경농축산물의 생산 및 인증실태/친환경농산물 인증자 교육/해충의 습성을 이용한 퇴치/건강한 밥상, 건강한 아이 만들어/협회소식/"학교급식 전문 식자재센터 설치를"/유기퇴비 제조방법 개발/중,산시성에 2억평 유기농 사과수출단지 조성/유기 및 일반 농산물의 품질 비교에 관한 연구/미생물 비료

• Korean journal of applied entomology
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• v.15 no.1 s.26
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• pp.1-6
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• 1976

his study was conducted to investigate selective toxicity of several organophosphorous and carbamic insecticides against the small brown planthopper (Laodelphax striatellus), the white-backed planthopper (Sogatella furcifera), the brown planthopper (Nilaparvata lugensEugens), and the green rice leafhopper (Nephotetix cincticeps). The test insecticides were the organophosphoric insecticides, Diazinon$(34\%\; Ec.,\; 3\%\; G.),$ $MEP(Sumithion 50\%\; Ec.)$, and PAP(Elsan\; 47.5\%\; Ec.)$ and the carbamic insecticides. MPMC $(Meobal\; 50\%\;WP.)$, $BPMC(Bassa\; 50\%\; Ec.)$, and carbofuran $(Curaterr; 3\%\; G.)$. Toxicitiy for emulsion concentrates and wettable powders were evaluated by dipping method of rice seedlings in the laboratory and that for granulated insecticides evaluated by submerged application with potted plants in the greenhouse. In the test of contact toxicity by seedling dips, Diazinon MEP and PAP showed significantly low toxicity to the brown planthopper and MEP to the green rice leafhopper. In the test of submerged application, Carbofuran showed almost equal toxicity to the four species of the hoppers, but Diazinon was greatly less toxic to the brown planthopper. In general. the organophosphorous insecticides tested seemed to be selective in toxicity to the species of the hoppers, while the carbamic insecticides being less selective. The carbamic insecticides such as MPMC, BPMC and Carbofuran were almost equal in toxicity to the four species of the hoppers tested.

• Korean journal of applied entomology
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• v.43 no.4 s.137
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• pp.311-315
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• 2004

The brown planthopper, Nilaparvata lugens, is among the most serious insect pests of rice. It is widely distributed in Asia, Australia and Pacific islands. An earlier mitochondrial DNA study revealed that there exist significant genetic differences between populations north and south of the Red River Delta region in Vietnam. However the mitochondrial DNA was not sufficiently variable to examine the sources of immigration. For a more detailed analysis of geographic population structure of N. lugens, we developed microsatellite markers. Thirty-seven putative microsatellite loci were isolated using a magnetic biotin method, and five primer pairs designed from the flanking regions of sequenced microsatellite clones were labeled with fluorescent. Of these five primer sets, two have proven to be useful across all the samples we used in this study. We used variation at these two microsatellite loci to test the hypothesis that N. lugens biotypes (1, 2, and 3) sampled from laboratory selection constituted distinct genetic units. Allele frequency differences among the three major biotype categories were not significantly different at one locus (27035). However, the other (7314) did show differences among the major three biotypes. The methods we describe here will be useful for studying population structure of crop pest and for tracking the patterns of migratory pest like the rice planthoppers.