점박이응애(Tetranychus urticae)는 250과 1400여종의 식물에 피해를 주고 있는 해충으로 높은 번식력, 근친 교배, 무성생식, 짧은 수명주기 로 년간 발생회수가 많기 때문에 약제에 대한 저항성이 빠르게 발달하는 종이다. 저항성 기작은 AChE 저해, sodium channel modulator, glutamate gated chloride channels allosteric, mite growth inhibitors, inhibitors of acetyl CoA carboxylase, mitochondrial ATP synthase 저 해, mitochondrial complex I, II, III, 그리고 electron transport 저해 등이 있으며 약제에 따라 작용기작이 다르므로 약제살포 시 확인이 필요하 다. 약제저항성 발달을 평가하는 독성시험방법으로 slide dip, leaf dip, leaf disc, topical application, vial leaf dip, spray potter tower, leaf vial dipping 등이 있으며 최근에는 분자학적 진단법 등도 개발되어 있으나 이들 방법은 해충 종이나 발육상태에 약제에 따라 정확도가 달라지므로 현장 에 가장 맞는 방법을 찾아야 할 것이다. 저항성 점박이응애를 효과적으로 관리하기 위한 방법으로 저항성 위험이 낮은 살응애제(chemical acaricide) 약제 선발, 천적인 칠레이리응애, 사막이리응애를 이용한 생물적 방제, 님, 제충국, 등 식물추출물이나 정유를 활용한 친환경적인 방법 등이 제시되 고 있으며 종합관리를 위한 다양한 요인을 찾아 약제 사용을 줄여 나가야 할 것이다.

전 세계적으로 농업해충의 약제 저항성 발달에 따른 방제 효율 저하는 농약의 과다 사용을 초래하여 농업의 생산성 저하 및 환경 파괴 문제 등을 야기하고 있다. 뿐만 아니라 위생해충의 경우에도 약제 저항성 발달이 심각한 수준으로 나타남에 따라 인류 보건에 큰 위협이 되고 있다. 해충의 약제 저항성은 자연계에 존재하는 극히 낮은 빈도의 저항성 형질이 반복적인 약제 사용에 따라 선발되는 과정을 통해 발달 되는데, 해충 약제 저항성의 효과적 관리를 위해서는 저항성 발달 기작의 규명과 신속·정확한 진단법의 확립이 필수적이다. 현재까지의 저항성 관리 는 저항성 발달 후 대응적(reactive)으로 이루어져 왔으나, 미래에는 보다 다양한 분자 마커를 활용하여 저항성 형질 빈도를 관리 가능한 수준에서 유지하는 선제적(proactive) 저항성 관리도 가능할 것으로 예상하고 있다. 본 발표에서는 해충 약제 저항성 연구의 현재 상황과 미래 전망에 대해 소개하고자 한다.

농가 현장에서는 미소 해충의 약제저항성 발달로 인하여 방제에 어려움을 겪고 있다. 본 연구는 약제저항성 수준을 효율적으로 진단하고, 화학적 방제 의사결정을 지원할 수 있는 약제저항성 관리 플랫폼을 구축하고자 수행하였다. 플랫폼은 크게 ⅰ) 농가 맞춤형 약제 추천, ⅱ) 지역별 약제저항성 지도로 구성되어 있다. 이용자는 잔류접촉법 기반의 생물검정법 RCVpW(Residual Contact Vial plus Water) 결과를 현장에서 입력하면 PLS에 부합 한 약제 정보를 제공받을 수 있다. 또한 생물검정 결과는 DB화를 통해 지역별 약제 저항성 정보 지도를 보여줌으 로써 해충별, 작물별, 연도별 저항성 패턴 결과를 확인할 수 있다. 본 플랫폼을 활용한다면 약제의 오남용을 줄임 은 물론 해충의 약제저항성 발달 지연 및 약제저항성 발달 양상을 확인할 수 있어 향후 방제전략 수립에 활용할 수 있을 것으로 생각된다.

The Varroa mite, Varroa destructor is an ectoparasite that parasitizes honey bees. The widespread usage of acaricides, particularly fluvalinate, has resulted in the emergence of resistance in Varroa mite populations all over the world. The goal of this study is to track fluvalinate resistance in Varroa mite field populations in Korea using both bioassay and molecular markers. To accomplish this, a residual contact vial (RCV) bioassay for on-site resistance monitoring was developed. Early mortality evaluation in the RCV bioassay was effective for reliably separating mites with the knockdown resistance (kdr) genotype, but late mortality evaluation was useful for distinguishing mites with additional resistance factors. The RCV bioassay of 14 field mite populations collected in 2021 revealed potential resistance development in four populations. Quantitative sequencing was used as an alternate method to examine the frequency of the L925I/M mutation in the voltage-gated sodium channel (vgsc), which is related with the fluvalinate kdr phenotype. While the mutation was not present in Varroa mite populations in 2020, it appeared in 2021, rose in frequency in 2022, and was practically ubiquitous across the country by 2023. This recent emergence and rapid spread of fluvalinate resistance within a span of three years demonstrate the Varroa mite's significant potential for developing resistance. This situation emphasizes the critical necessity to replace fluvalinate with alternate acaricides, such as fenpyroximate, coumaphos, and amitraz. A few novel vgsc mutations potentially involved in resistance were identified. Potential factors driving the rapid expansion of resistance were further discussed.

The present study identified several antecedents that create perceived resistance to supply chain management (SCM) change. This work particularly emphasizes SCM change, which is notable given its central role in reacting market orientation and varied environmental and managerial conditions. A careful case study on a small and medium sized food production company in South Korea leads to the formulation of our framework including one second-order construct of ‘resistance’ as well as eight first-order constructs of ‘implementing the payment terms’, ‘balancing of business process’, ‘fear of responsibility’, ‘business sustainability transparency’, ‘past experience of failure’, ‘competence of work personnel’, ‘cooperation with third parties’ and ‘sharing personnel information with partner’. The hypothesized relation of first- and second-order construct was validated using survey sample data collected from 350 respondents who completed their questionnaire instrument. Results from confirmatory factor analysis revealed that nomological validity was established at statistical significance level by identifying six first order constructs of ‘implementing the payment terms’, ‘fear of responsibility’, ‘business sustainability transparency’, ‘past experience of failure’, a conbined construct of 'competence of work personnel/ cooperation with third parties’ and ‘sharing personnel information with partner’. The findings from our work are expected to provide important insights to the strategy for SCM risk management for small and medium sized company.

Growing resistance to insecticides, especially pyrethroids, poses an increased risk for insect control world-wide. Thus, alternative compounds are urgently needed. Accordingly, my laboratory has been investigating synthetic materials, as well as natural products, which are an attractive source of new chemistries. We have examined the insecticidal and synergistic activity of new compounds using Drosophila melanogaster and the mosquitoes Aedes aegypti and Anopheles gambiae as model insects. In addition, we have also been investigating the modes of action of experimental molecules in various physiological preparations. Natural product research included thymol, which was toxic to Ae. aegypti adults at doses (3-50 μg/mg) similar to published toxicities for the cabbage looper larvae, Trichoplusia ni. On homomultimeric Anopheles gambiae GABA receptor-chloride channel complex expressed in Xenopus laevis oocytes, thymol acts as a positive allosteric modulator, increasing the potency and maximal effectiveness of applied GABA, consistent with the sluggish paralysis it elicits in exposed insects. Other studies investigated matrine; a bioactive component extracted from Sophora flavescens that is used as the main ingredient in Chinese bio-pesticidal products. Matrine caused flaccid paralysis in headless fourth instar larvae of Ae. aegypti (50% paralysis in 5 hours at 8 ppm) and was toxic to adult females by contact (topical LD50 = 258 ng/mg). Adult toxicity was increased about 2-fold by pretreatment with the mono-oxygenase inhibitor, piperonyl butoxide. Interestingly, this compound was much less effective on D. melanogaster in either glass contact or feeding bioassays. Adult mosquito knockdown was rapid, with little or no expression of hyperactivity or hyperexcitability. Matrine (ca. 1 mM) had effects similar to thymol on expressed An. gambiae GABA receptors, and reduced EPSP amplitude at the Musca domestica neuromuscular junction, without any evidence of neuroexcitation or membrane depolarization. These physiological actions are sufficient to explain the whole animal intoxication by matrine, but require relatively high concentrations to manifest themselves. Other studies tested a series of potassium channel blockers, including 1-((2-chlorophenyl)diphenylmethyl)-1H-pyrazole (TRAM-34), 11-dansylaminoundecanoic acid (DAUDA), and 5-hydroxydecanoic acid (5-HDC) as insecticides and synergists of pyrethroids. We also evaluated the action of these compounds in patch clamp recordings of engineered HEK cells expressing Anopheles gambiae Kv2.1 channels. Patch clamp studies revealed that fatty acid compounds without functional groups in the alkyl chain (e.g., decanoate, DAUDA) yielded a more potent blocking action on Kv2.1 currents than substituted fatty acids (e.g., 5-HDC). Also, in comparison to 2-methoxy-N-((1-phenylcyclopentyl)methyl)benzamide (2S-65465), a known Kv2 channel blocker (IC50 = 100 nM), decanoate and DAUDA were 6-fold and 12-fold less active, respectively, as blockers of potassium current. TRAM-34 was the least potent inhibitor tested in patch clamp studies (IC50 = 30 uM). When tested on D. melanogaster CNS, the compounds typically gave an initial increase in firing rate, followed by a decrease, both effects at micromolar concentrations. Various toxicity assays showed the same potency ranking as that obtained through patch-clamp recordings, indicating a possible connection between channel block and whole organism effects. In order to possibly improve the insecticidal activity of the fatty acids, we synthesized derivatized analogs (e.g., methyl esters) presumed to better penetrate the cuticular barrier, but activity did not improve. Finally, in contrast to a published patent, we found that fatty acids did not show much synergism with pyrethroids. The implications of this work for resistance management will be discussed.

The control of crop diseases still largely relies on spray applications of standard synthetic fungicides. As a result, the development of fungicide resistance by pathogens is a major limiting factor for the control of diseases. In this paper, the recent outbreak of practical resistance to fungicides including sterol demethylation inhibitor (DMI), Quinone outside inhibitor (QoI), and succinate dehydrogenase inhibitor (SDHI) fungicides as well as the progress of related research will be discussed. To combat resistance development, the Research Committee on Fungicide Resistance, the Phytopathological Society of Japan, was established in 1991 and has been conducting several activities. The Committee made a guideline indicating how to use at-risk fungicides. The occurrence of fungicide resistance may rather increase in the future as the choice of fungicides is often difficult due to the lack of effective alternatives. Development and integration of disease management tools such as disease-resistant or -tolerant cultivars and non-fungitoxic disease resistance inducers need to be accelerated more rapidly not only to dissolve the problem of fungicide resistance but also to reply public concerns about agrochemicals.

Dow AgroSciences has a long history of proactive insecticide resistance management efforts. In our experience, the key to managing resistance is to reduce selection pressure on any one mode-of-action by convincing farmers to rotate among effective insecticide products with different modes of action and to use only the number of insecticide applications required for effective Integrated Pest Management (IPM). To accomplish this, farmers may need to use non-chemical control methods and to rotate to insecticide products that are effective but may not provide the highest levels of control. Integrating rotation of effective insecticides with other IPM techniques can provide high quality and quantity of the harvested crop. We will share our experience managing spinosyn resistance with a series of best management practices for western flower thrips (Frankliniella occidentalis Pergande) and our resistance management recommendations for ISOCLASTTM (sulfoxaflor), our new insecticide for control of sap-feeding insect pests. Dow AgroSciences is an active member of the IRAC (Insecticide Resistance Action Committee) and strongly supports the placement of IRAC mode-of-action group numbers on insecticide product labels. This simple approach greatly facilitates effective product rotation. Resistance management is critical to maintaining the effectiveness of the current arsenal of conventional insecticides and transgenic insect-resistant crops for as long as possible. Responsibility for resistance management is shared between manufacturers, formulator-distributors, retailers, influencers (universities, government), and farmers. It is up to all of us to make sure all stakeholders, and especially farmers, fully understand the benefits associated with insecticide resistance management (IRM) programs and the consequences associated with the resistance development in insect pest populations. ™ Trademark of The Dow Chemical Company ('DOW') or an affiliated company of Dow.

Highland agriculture is a kind of specified agricultural term based on altitude and meteorological characteristics and their main crops are seed potato and vegetables. These crops are only cultivated in summer season when insect pests are most dynamically attacking such as diamondback moth (DBM, Plutella xylostella) and aphids son on. Aphids, insect virus vector, are really annoying factor, particularly in seed potato. Furthermore, these insect pests formed small sub-population or colony based on small field area. For instance, green peach aphid (GPA, Myzus persicae) populations’ genetic backgrounds and insecticide susceptibilities were different even in the same Pyeongchang area. Therefore, we suggested that highland agriculture should adopted IRM strategy for the control of insecticide-resistant aphids. First. Monitoring of annual fluctuation of insect population using traps for more effective monitoring. Second. Performing the insecticide resistant monitoring patch by patch or field using high throughput molecular diagnosis for more accurate monitoring. Third. Establishing the insect pest management program based on these results. We will deeply discussed practical monitoring results and IRM strategy in highland agriculture.

An attempt was made to stimulate future research by providing exemplary information, which would integrate published knowledge to solve specific pest problem caused by resistance. This review was directed to find a way for delaying resistance development with consideration of chemical(s) nature, of mixture, rotation, or mosaics, and of insecticide(s) compatible with the biological agents in integrated pest management (IPM). The application frequency, related to the resistance development, was influenced by insecticide activity from potentiation, residual period, and the vulnerability to resistance development of chemical, with secondary pest. Chemical affected feeding, locomotion, flight, mating, and predator avoidance. Insecticides with negative cross-resistance by the difference of target sites and mode of action would be adapted to mixture, rotation and mosaic. Mixtures for delaying resistance depend on each component killing very high percentage of the insects, considering allele dominance, cross-resistance, and immigration and fitness disadvantage. Potential disadvantages associated with mixtures include disruption of biological control, resistance in secondary pests, selecting very resistant population, and extending cross-resistance range. The rotation would use insecticides in high and low doses, or with different metabolic mechanisms. Mosaic apply insecticides to the different sectors of a grid for highly mobile insects, spray unrelated insecticides to sedentary aphids in different areas, or mix plots of insecticide-treated and untreated rows. On the evolution of pest resistance, selectivity and resistance of parasitoids and predator decreased the number of generations in which pesticide treatment is required and they could be complementary to refuges from pesticides To enhance the viability of parasitoids, the terms on the insecticides selectivity and factors affecting to the selectivity in field were examined. For establishment of resistant parasitoid, migration, survivorship, refuge, alternative pesticides were considered. To use parasitoids under the pressure of pesticides, resistant or tolerant parasitoids were tested, collected, and/or selected. A parasitoid parasitized more successfully in the susceptible host than the resistant. Factors affecting to selective toxicity of predator are mixing mineral oil, application method, insecticide contaminated prey, trait of individual insecticide, sub-lethal doses, and the developmental stage of predators. To improve the predator/prey ratio in field, application time, method, and formulation of pesticide, reducing dose rate, using mulches and weeds, multicropping and managing of surroundings are suggested. Plant resistance, predator activity, selective insect growth regulator, and alternative prey positively contributed to the increase of the ratio. Using selective insecticides or insecticide resistant predator controlled its phytophagous prey mites, kept them below an economic level, increased yield, and reduced the spray number and fruits damaged.