• Korean journal of applied entomology
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• v.61 no.4
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• pp.519-528
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• 2022

The western flower thrips, Frankliniella occidentalis, infests the hot pepper cultivated in greenhouses and has been considered to be controlled by a natural enemy, Orius laevigatus. However, sporadic outbreaks of the thrips due to fast population growth occasionally need chemical insecticide treatments. This study was designed to develop an optimal integrated pest management (IPM) by using selective insecticides along with a safe re-introduction technique of the natural enemy after the chemical insecticide treatment. First, chemical insecticides were screened to select the high toxic commercial products against F. occidentalis. Five insecticides containing active components (pyriproxyfen+spinetoram, abamectin, spinosad, acetamiprid, and chlorpyrifos) were selected among 17 commercial products. These five selected insecticides gave different toxic properties to the natural enemy, O. laevigatus. Especially, abamectin and spinetoram gave relatively low toxicity to the natural enemy compared to organophosphate or neonicotinoid. Furthermore, the five selected insecticides were assessed in their residual toxicities against O. laevigatus. Organophosphate and neonicotinoid insecticides showed relatively longer residual toxicity compared to abamectin and spinosads. Indeed, abamectin or spinetoram did not give any significant toxicity to O. laevigatus after 3 days post-treatment. These residual effects were further supported by the assessment of the chemical residue analysis of the insecticides using LC-MS/MS. These results suggest an IPM technology: (1) chemical treatment of abamectin or spinetoram against sporadic outbreaks of F. occidentalis infesting hot pepper and (2) re-introduction of O. laevigatus to the crops after 3 days post-treatment to depress the equilibrium density below an economic injury level.

• Journal of Sericultural and Entomological Science
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• v.52 no.2
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• pp.155-158
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• 2014

Biological control of Tetranychus urticae by Phytoseiulus persimilis was carried out on tropical plant (Erythrina caffra, Phytolacca dioica) from April to July. Experiments were conducted at Tropical Plant Resources Research Center of Korea National Arboretum. Phytoseiulus persimilis (200 individual/tree) was released once (12. May) to control Tetranychus urticae. We measured the density of leaf-feeding T. urticae at intervals of approximately 2weeks after introducing P. persimilis. The densities of T. urticae were suppressed 10%, in Erythrina caffra and 49% in Phytolacca dioicas after 2 weeks introducing them.

• The Korean Journal of Mycology
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• v.31 no.1
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• pp.44-49
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• 2003

Several microbial biocontrol products (Greenbiotech Co., Paju, Korea), Green-all T (Trichoderma harzianum), Green-all S(Bacillus sp.) and Green-all G (Streptomyces sp.) were supplemented with organic amendments such as sawdusts and rice hulls to study on efficacy of biological control of seeding damping-off of cucumber caused by Pythium ultimum. Sawdusts amended into potato dextrose agar alone could inhibit in vitro mycelial growth of P. ultimum. All there microbial products of Green-all T, Green-all G and Green-all S significantly reduced seeding damping-off (LSD, P=0.05). However, several amendments such as sawdusts and rice hulls into Green-all T and Green-all S products did not increase efficacy of biological control compared to non-amended treatment. In contrast, supplements of aminodoctor containing several amino acids (Greenbiotech Co., Korea) into Green-all G product significantly increased efficacy of biological control of seeding damping-off, resulting in from 42% to 2% disease incidence in relation to seedling emergence (LSD, P=0.05). Also, amendment of sawdusts into Tricoderma product significantly increased efficacy of biological control as disease index of 5.0 compared to non-amended control of 56.0 in Green-all T product alone. This indicates that organic amendments could increase efficacy of biological control of cucumber seedling damping-off.

• Agrochemical news magazine
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• v.14 no.6 s.117
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• pp.40-43
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• 1993

• 농업기술회보
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• v.45 no.1 s.514
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• pp.41-43
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• 2008

• Korean journal of applied entomology
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• v.48 no.3
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• pp.355-359
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• 2009

By releasing predatory mite, Amblyseius swirskii Athias-Henriot, with 25 individuals per cucumber plant in a commercial greenhouse (1,600 $m^2$), the population of western flower thrips, Frankliniella occidentalis (Pergande), was kept under the economic threshold level. The initial thrips population of 18.3 individuals per leaf decreased to 2.1 individuals per leaf after four weeks, while the number of A. swirskii reached to 16.6 individuals per leaf. It was also observed that at a point where the thrips occurred in high density of about 34.3 individuals per leaf, A. swirskii population built up on the lower part of cucumber plant first, but as time passed the predatory mites moved upward to the top of the plant and aggregated.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2019.10a
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• pp.49-49
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• 2019

국립수목원은 열대유용식물의 BT산업 원천소재 확보 제공을 목적으로 열대자원연구센터를 건립하여, 열대 및 아열대 전시원을 관리하고 있다. 온실의 특성상 일반 재배환경과는 다르게 여러 종류의 식물의 혼합 식재되어 있는 특성이 있어서 농업환경과 달리 해충의 급격한 돌발에 의한 온실 전체적인 피해의 위험성이 적은 반면에 안정된 환경으로 인해서 해충의 취약한 몇몇 수목의 경우 해충이 급격히 늘어날 수 있다. 본 실험은 여러 종류의 식물이 혼재되어 있는 수목 온실 내에서 생물적 방제를 이용하여 주요 해충류인 진딧물류 및 가루 깍지벌레, 잎응애류 방제 가능성을 타진하고자 진행되었다. 진딧물이 집중적으로 발견된 열대식물 5종(Acalypha hispida, Justicia gendarussa, Hamelia patens, Ficus petersii, Hibiscus rosa-sinensis)을 중심으로 천적 방사 및 Banker plant 설치를 진행했다. 최초 조사일인 2015년 3월 10일, Tropical 1에 진딧물류의 발생이 많이 확인되어 포식성 천적인 미끌애꽃노린재를 투입했다. Tropical 2는 2015년 3월 17일 기생성 천적인 콜레마니진디벌과 선발된 Banker plant를 적용하여 방제 되었다. 철모깍지벌레가 발견된 열대식물 3종(Sanchezia parvibracteata, Brillantaisia lamium, Pseuderanthemum atropurpureum)을 중심으로 적용 천적으로 어리줄풀잠자리, 애홍점박이 무당벌레와 깍지무당벌레를 선별했다. 천적을 대상으로 철모깍지벌레에 대한 포식능력을 조사했으며 애홍점박이 무당벌레가 어리줄풀잠자리 보다 2.8배, 깍지무당벌레보다 2.9배 포식능력이 뛰어남을 확인했다. 잎응애류가 발견된 열대식물 2종(Acalypha wilkesiana, Erythrina caffra)은 천적으로 사막이리응애와 칠레이리응애를 적용하였다. 괭이밥응애 성충과 알의 포식력을 검증한 결과 사막이리응애가 괭이밥응애를 먹이로 증식이 가능한 것으로 확인되었다. 괭이밥, 괭이밥응애, 사막이리응애를 효과적으로 조합한 응애류 방제를 위한 새로운 Banker plant의 개발 가능성을 확인할 수 있었다. 연구는 열대온실의 열대식물 관리에 대한 생물학적 방제의 지속적인 모니터링을 통해 종합적 방제의 관리 자료로 이용되어 새로이 온실을 조성하는 경우 식재기반조성에 실질적인 도움을 줄 수 있으며, 추후 열대식물의 자원 식물로서의 활용성을 높일 수 있다.

• The Korean Journal of Mycology
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• v.43 no.3
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• pp.180-184
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• 2015

For selection of effective antagonists for control Sclerotinia rot of lettuce, 29 bacteria were isolated from soil in Korea. The bacterial isolates M27 and RM43 identified as Bacillus sp, were selected as prospective agents for inhibiting mycelial growth of Sclerotinia sclerotiorum and Sclerotinia minor. Among the selected isolates, Bacillus amyloliquefaciens M27 effectively suppressed incidence of Sclerotinia rot by Sclerotinia sclerotiorum and Sclerotinia minor in the lettuce nursery.

• The Korean Journal of Pesticide Science
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• v.14 no.4
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• pp.326-331
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• 2010

Bacillus subtilis B29, B. subtilis M10 and Streptomyces sp. CC19 obtained from phyllosphere of cucumber plants were selected for biological control of fungal air-borne diseases. For the downy mildew, diseased area of B. subtilis B29, B. subtilis M10 and Streptomyces sp. CC19 showed 0.5%, 20.2% and 42.0%, but that of control was 82.0% respectively, in cucumber seedling test. Incidence of powdery mildew by once application of B. subtilis B29, B. subtilis M10 and Streptomyces sp. CC19 was 2.8%, 3.6% and 12.3%, respectively, whereas that of control was 65.6%. On the gray mold, diseased area of B. subtilis B29, B. subtilis M10 and Streptomyces sp. CC19 was 8.0%, 30.8% and 5.2%, respectively, compared to 81.2% for the control. Therefore, B. subtilis B29 could be a prospective antagonist for biological control of powdery mildew, downy mildew and gray mold of cucumber plant.

• Landscaping Tree
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• s.127
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• pp.37-40
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• 2012

지난 호의 소나무류 가지마름성 병해에 이어 이번 호에서는 소나무류 잎마름성 병해를 소개한다. 소나무의 잎에서 나타나는 잎마름성 병해는 증상과 원인이 다양하여 정확한 원인을 밝히기가 매우 어렵다. 그 이유는 수목의 이상 증상은 기본적으로 1) 비기생성(생리적, 비점염성) 원인, 2) 기생성(생물적, 전염성) 원인에 의하여 발생하는데, 진단 결과에 따라 수목의 재배환경을 점검하고 개선하여야 할 문제인가(비기생성 원인), 또는 약제를 사용하여야 할 것인가(기생성 원인)를 먼저 결정하여야 한다. 그 이유는 피해 원인이 물, 온도, 제초제 등 비기생성 원인에 의한 것이라면 재배환경의 개선 또는 원인 제거만으로도 충분히 나무를 회복시킬 수 있고, 병원균에 의한 것이라면 정확한 병명 진단 후에 적용 약제를 적절한 시기에 살포하여 불필요한 농약의 사용을 줄이면서 효과적으로 방제할 수 있기 때문이다. 수목의 잎에서 흔히 나타나는 이상 증상은 다음과 같이 비기생성 원인과 기생성 원인을 포함하여 크게 세 가지로 구별할 수 있으며, 기본적인 진단 요령과 원인은 다음과 같다.