건조식품저장에서의 해충문제

손진,류문일 고려대학교 자연자원연구소 2000 自然資源科學硏究 Vol.8 No.-

Ⅰ.서론 Ⅱ.건조저장식품 해충 Ⅲ.저장해충에 의한 피해상 1.직접피해 2.간접피해 3.식품위생 Ⅳ.저장해충 조사 방법 Ⅴ.저장해충 관리 및 앞으로의 과제 1.저장해충 관리 2.식품 위생과 해충 문제 3.과제

쌀 저장중의 곰팡이와 저곡해충 : 제1보. Tribolium castaneum Herbst와 Aspergillus species의 저장미에서의 생육 Part Ⅰ. Activities of Tribolium castaneum Herbst and Aspergillus species

金永培,柳文一 한국응용생명화학회 1982 Applied Biological Chemistry (Appl Biol Chem) Vol.25 No.4

Tribolium castaneum은 健全米粒에서 완전한 生活環을 完成하여 쌀에 加害可能性을 보였으며 그 活動은 1.3%의 수분함량의 경우는 증가를 초래하였으나 곰팡이의 증식은 오히려 저해하는 경향을 보였다.T.castaneum의 생육은 Asp. repens에 의해 安定化되었으나 Asp. niger에 의해서는 지체되었다. To investigate the influences of biological factors on stored rice and their interactions, the activities of red Hour beetle( Tritolium castaneum) and 2 species of Aspergillus was observed during 6 weeks at 28°"±1℃. It was found that the red flour beetle could complete its life cycle on rice in six weeks. Its activity caused the inclose of moisture content of rice(max. 1.3%) after 6 weeks, but the number of mold propagule on the surface of stored rice decreased. The growth of red flour beetle showed a stabilizing tendency on rice inoculated with Asp. repens while it was retarded with Asp. niger.

Stored pest management in response to the climate change in Korea: Problems and task

Mun Il Ryoo,Ki Jeong Hong,Ja Hyun Na 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.10

Life history and intrinsic rate of natural increase of the rice weevil, Sitophilus oryzae (L.) (Coleoptera: Curculionidae) in rice

Ryoo, Mun-Il,Cho, Ki-Jong 한국곤충학회 1986 Korean journal of entomology Vol.16 No.1

백미에서 쌀바구미의 내적자연증가율은 2$0^{\circ}C$, $25^{\circ}C$, 3$0^{\circ}C$에서 각각 0.1759, 0.3242, 0.4798로 산출되었으며 실험온도역에서 일차 직선적 관계를 보였다. 평균세대기간은 해당온도에서 각각 18. 8, 10.5, 7. 1주로 추정되었다. 밀에서 보고된 쌀바구미의 생활사와 비교 했을때 백미에서의 동곤충의 증가율은 낮은 것이었으며 또한 세대기간에 미치는 온도효과는 더 현저한 것으로 나타났다. 이러한 현상은 밀에서의 그것에 비해 백미에서 쌀바구미의 총산란수가 적고, 동시에 연령에 따른 산란분포가 상이한 것에서 기인되는 것으로 사료된다. The intrinsic rate of natural increase of the rice weevil in polished rice was estimated to be 0. 1755, 0.3242 and 0.4789 per head per week at 20$^{\circ}C$, 25$^{\circ}C$ and 30$^{\circ}C$, respectively. The mean generation time was 18.8, 10.9 and 7. 1 weeks at the temperatures, respective. In comparison with the reports published in wheat, the life history phenomena were somewhat different: the rate was lower and the generation time was more sensitive to the temperature in polished rice than in wheat. Since other characteristics affecting the rate (development time, mortality during development and longevity of adults) were similar in both medium, differences in the life history phenomena could be due to the lower fecundity and its distribution pattern in relation to female age.

이화명나방 幼虫의 空間分布 特性

MUN IL RYOO,MOON HONG LEE 한국응용곤충학회 1985 한국응용곤충학회지 Vol.24 No.1

1973년부터 1976년까지 농촌진흥청 농업기술연구소 포장에서 수집된 성적(成績)을 분석(分析), 이화명나방유충(幼蟲)의 공간분포특성(空間分布特性)을 조사(調査)하였다. 유충(幼蟲)의 공간분포(空間分布)는 세대(世代)에 차이(差異)없이 부(負)의 이항분포(二項分布)를 따르고 있었다. 집중계수(集中係數)(Green's coefficient of dirpersion)를 지표로 하였을때 유충(幼蟲)의 집중도(集中度)는 초기고집중기(初期高集中期), 과도기(過渡期), 저집중안정기(低集中安定期)의 3 단계로 진전됨이 판명되었으며 이중 과도기(過渡期)를 제외(除外)한 각(各)단계는 각세대(各世代)에서 공통(共通) 'k'에 의해 집중도(集中度)를 정의할 수 있었다. 집중도(集中度)의 단계적 변화의 원인(原因)으로 유충(幼蟲)의 주간이동(株間移動)이 판명(判明)되었으며 제1세대에서 3령유충(齡幼蟲) 제2세대에서 5령유충(齡幼蟲)이 분산(分散)하는 것으로 나타났다. 유충집중도(幼蟲集中度)에 있어서의 이러한 특징(特徵)은 제2세대에서 뚜렷하였으며 제1세대의 경우 해(년(年))에 따른 변이폭이 컸다. 이는 제1세대 유충(幼蟲)의 생명계(生命系)(Life system)가 제2세대의 그것에 비해 외적(外的) 환경요인(環境要因)의 변이에 따라 크게 영향받고 있음을 시사하는 것으로 생각되며 Day-Degree 개념에 따른 환경변이의 수렴이 검토될 수 있을 것으로 사료(思料)된다. The data on the striped rice, borer populations, collected in the four years from 1973 to 1976, was reanalyzed to study the characteristics in the aggregation pattern of the insect larvae in the paddy fields. The distribution pattern of the larvae was well fitted to the negative binomial model in both the first and the second generation. With reference to the Green's coefficient of dispersion estimated, the aggregation of the larvae was categorized into three phases: initial high aggregation, changing, and dispersed stable phase. Except the changing phase, each phase in each generation could be defined by a common k. The phase-change was initiated by the larval dispersal between hills of the rice plants: the larvae of the third stage and those of the fifth stage, for the first and second generation, respectively. The characteristics of the aggregation pattern were stable in the second generation. In the first genaration, the pattern was more or less variable, indicating that the life system of the insect in the first generation was more susceptible to the variations of the external physical factors than that in the second generation.

Behavioural Besponse of Parasite to Their Patchily Distributed Hosts: A Possibility of Density-dependent Interaction between Parasite and Hosts in Heterogenous Environments

Ryoo, Mun-Il 한국곤충학회 1983 Korean journal of entomology Vol.13 No.2

기생자(寄生者)의 기주분포상(寄主分布相)에 따르는 행동반응의 수리적모델을 유도하고 이 행동반응을 포함한 기능반응의 수리적모델을 설정하였다. 동 기능반응모델은 S형 기능반응과 동시에 유사간섭현상을 유기(誘起) 하였으며 기능반응에서 기주의 밀도의존적 치사율을 나타내는 영역은 4 개의 매개변수(공격계수, handling time, 기본행동 및 밀도의존행동계수)에 의해 결정되었다. S형 기능반응과 유사간섭현상은 기생자-기주 시스템의 안정현상에 중요한 요인으로 알려지고 있는 바 기생자의 행동반응을 통한 이들의 동시적 유기현상은 자연계에서의 동 시스템의 안정이 이질적 환경에 의해 유래되는 별도의존적 과정임을 암시하는 것으로 생각된다. A model of behavioural response of parasites to patchily distributed hosts is constructed in terms of patchness regression of foraging. A model of overall functional response including the behavioural response generates a sigmoid functional response and pseudo-interference. From the results, a density-dependent interaction between parasites and hosts in heterogenous environments is suggested.

Population dynamic consequences of larval competition in stage-structured host-parasitoid systems

Youngwoo Nam,Mun Il Ryoo 한국응용곤충학회 2008 한국응용곤충학회 학술대회논문집 Vol.2008 No.05

In many host-parasite interactions, intraspecific competition among host could have a significant role to the host-parasite population dynamics, yet so far a few studies has been reported theoretically and experimentally(ex. Umbanhowar and Hastings, 2002). We examined the effect of larval competition using a stage-structured matrix model with parameters estimated from the Plodia interpunctella-Bracon hebetor and Sitophilus zeamais-Aniopteromalus calandrae experimental system. The maize weevil population showed a typical growth pattern of populations with contest type competition. After introduction of A. calandrae to the system, maize weevil population was dramatically decreased to be extinct. In contrast, the Indian meal moth population showed a typical pattern of scramble type competition. Introduction of B. hebetor to the system induced higher moth density and longer persistence of the Indian meal moth population than that in the maize weevil system. These results seem to be caused by differences in intraspecific competition between Indian meal moth and maize weevil. The applications of these results should be considered in biological control of Indian meal moth.

Population Interaction between Sitophilus zeamais and Its Parasitoid, Anisopteromalus calandrae

Youngwoo Nam,Key-Il Shin,Kijong Cho,Mun Il Ryoo 한국응용곤충학회 2013 한국응용곤충학회 학술대회논문집 Vol.2013 No.04

Population dynamics of maize weevil, Sitophilus zeamais, and their parasitoids Anisopteromalus calandrae were examined while considering the spatio-temporal interactions using population modelling as a tool. The modelling of two species host-parasitoid systems identified the some factors concerning the long-term dynamics of interacting populations. In the single host system, the total density of S. zeamais increased exponentially and reached a saturated, asymptotic level with time. This stabilization in the density could be explained by the spatio-temporal dynamics among the patches. S. zeamais disperses continuously from patches of high density to those of low density. This density-dependent dispersal could be one of the mechanisms for stabilizing the S. zeamais population density. In the S. zeamais-A. calandrae system, both populations showed long-term coexistence. The long term coexistence could be attributed to spatio-temporal interactions of S. zeamais and A. calandrae resulted from dispersal of host and a non-random searching behavior of the parasitoid. Because such spatio-temporal variation in population dynamics, the overall host-parasitoid system may have been in a stable state, although the local population system in each patch was unstable.

Biological control of insect pests in Korea: a perspective

Minho Lee,Youngwoo Nam,Mun Il Ryoo 한국응용곤충학회 2010 한국응용곤충학회 학술대회논문집 Vol.2010 No.10

Dynamics of prey/host and predator/parasitoid interaction has been the main concern of the population ecology during the second half of the 20th century. Many theoretical and experimental studies have been conducted and discussed. The main questions were whether the interaction could be in stable state and whether the parasitoid/predator could regulate the host/prey populations, and if so at what levels. The questions are not yet solved, but some hypotheses have been presented that the prey/predator interaction could be in stable state, when both the predator and prey population are under intraspecific competition so that both populations could be limited at a low levels. This prerequisite, however, could not be easily satisfied in nature and several hypotheses have been discussed up to date. Biological control of pests, which is based on the predator-prey system dynamics, has not always been successful, because we do not understand the systems sufficiently. Thus, most successful cases of the biological control were dependent upon ‘trial and error’. But as the predator-prey system dynamics could be well understood in the future, more systemic control program of biological control could be possible. In this review, we analyzed the studies for biological control of pests in Korea based on 164 cases reported in the last forty years and will consider the future goal of the studies for more reliable control programs.

Border Effect of Spatial Distribution of Rice Stripe Virus Disease Caused by Vector Insect, Laodelphax striatellus

Minho Lee,Yurim Jeong,Man-Young Choi,Mun-Il Ryoo 한국응용곤충학회 2010 한국응용곤충학회 학술대회논문집 Vol.2010 No.05

In many cases over the years, we failed to forecast accurately outbreak of Rice stripe virus (RSV) disease using population density of overwintering small brown planthopper (SBPH), Laodelphax striatellus. What is the source of error in this viral disease assessment? For answering the question, spatial distribution of RSV in paddy fields was investigated in relation to the yield of rice grain, and the population density of overwintering SBPH in ridge of paddy fields. Total 14 paddy fields in 5 regions were surveyed in June, 2008. Disease assessment was carried out with each of 30 rice plants in the one of the borders, 5th, 10th line from ridge, and 90 rice plants in diagonal line for conventional method. The ears of rices from 18 plants in the same surveyed line were collected in the late of August for the weights of 100 rice grains. The infection rate of RSV was decreased by the distance from ridge; on the contrary, the increase tendency was shown in the yield of rice grains in the middle of paddy field. It is suggested that the border effect of viral distribution between ridge and paddy field is caused by the spatial distribution of the vector insect. Thus, in this case, the narrow border effect could represent that the SBPH migrated short distance from the ridge to paddy field. The conventional method, observing the disease in middle area of diagonal line, showed no correlation to the population density of overwintering vector generation in ridge. It might cause underestimation of the regional disease rate. The counting of RSV-diseased plant in border line only overestimated it also. However, the RSV infection rate in the near border had highly positive linear relationship (R2=0.91) to the regional average values by regression analysis. Therefore, the near border sampling method can improve the RSV disease risk assessment.