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Rameswor Maharjan,Soondo Bae,Hwijong Yi,Wonhoon Lee,Yoonnam Young,Yunwoo Jang 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.10
Nysius Dallas, 1852, is one of the most common and widely distributed genera under the superfamily Lygaeoidae. Species under this genus are hard to identify due to similarity of the species and variability of the coloration. The Nysius species were collected with the help of aspirator and plastic vile in the perilla crop fields in RDA, Miryang, Korea. Korean species of the Nysius were identified, and three species including a newly reported species N. inconspicuus were recognized. Morphological and genetic characteristics of species were illustrated, and a key to species of Korean Nysius was provided. The DNA barcoding information of N. plebeius and N. inconspicuus were recorded.
Trap cropping for Management of bugs of mungbean, Vigna radiata (L.) Wilczek. : Trap crop in Nepal.
Rameswor Maharjan,Chuleui Jung 한국응용곤충학회 2011 한국응용곤충학회 학술대회논문집 Vol.2011 No.10
Mungbean is an important crop in Nepal. Heteropteran bugs, Nezara virudula, Dolycoris baccurum, and Melanacanthus scutellaris are significantly influencing qualitative and quantitative loss in soybean and mungbean. Though pesticide application is common practice for management of these bugs, pesticide avoidance by the bugs stalls proper management. As an alternative, trap cropping with variety mostly preferred by the bugs as trap crops along with the main crop is considered. Selection of most preferred mungbean variety was performed with six (VC 6173 A; VC 6153 B-20G; VC 3960 A-88; Kalyan; Pratikchha; Saptari local) relative to Saptari local variety. Significant difference was recorded in number of bugs occurrence among the six varieties with maximum number of bugs in VC 6173 (3 bugs/plant) which showed lowest yield. For application, three different trap crop designs were employed in the field. There was significant difference between the main crop i.e. variety Pratiksha and the variety VC6173A used as trap crop in two designs. In conclusion VC6173A is a probable trap crop and the two designs can be employed in the field.
Leafminer fly Liriomyza sp. (Diptera: Agromyzidae) and Their Natural Enemies in Potato Crop in Korea
Rameswor Maharjan,Chuleui Jung 한국응용곤충학회 2012 한국응용곤충학회 학술대회논문집 Vol.2012 No.10
Liriomyza leafminers comprise a pest group that causes both considerable economic losses and serious quarantine problems. In recent years, the pest status of Liriomyza sp. has changed in Korea, as well as other areas of the world. Potato field survey was conducted in 157 farmers’ field from five provinces during 2011 and 2012. Foliar insect monitoring was done within 5 minutes walking distance by visual inspection. Leafminer fly and parasitoids were collected by sweeping net (10 sweeps/field) in same field in each time. Overall, potato insect species collected constituted of 7 orders, 22 families and 42 species. Aphis gossypii was most abundant species in all the locations. However, Potato tuber moth, Pthorimaea operculella was only dominated species in Boesong (Jellanam-do). L. huidobrensis was the first record infesting the potato in Korea. Liriomyza huidobrensis was only found from Miryang (Gyeongsangnam-do) and Goreyong (Gyeongsangbuk-do). There is a rich complex of parasitoid species; 18 species of parasitoids were recorded. Most parasitoid species (11) belong to the Eulophidae family. The most abundant species were the ectoparasitoid, Diglyphus isaea and endoparasitoid, Ganaspidiumsp. The number and diversity of parasitoid species in potato crop in Korea provides insight into the development of integrated management strategies of leafminer pests.
Rameswor Maharjan,Chuleui Jung 한국응용곤충학회 2013 한국응용곤충학회 학술대회논문집 Vol.2013 No.04
The potato leafminer fly, Liriomyza huidobrensis (Blanchard) (Diptera: Agromyzidae) is a polyphagous pest attacking many vegetables and ornamental plants. We found L. huidobrensis were infesting potato crop in Miryang and Goreyong in 2011. Five potato (Solanum tuberosum) varieties (Ghowun, Daeri, Sumi, Chubeak, and Seohong) were tested for the preference of L. huidobrensis. In the olfactormeter bioassay, leafminers chose the Ghowun variety most (55%) followed by Sumi (18%). Remaining 3 varieties were chosen less than 10%. When leafminers choose and move toward the preferred variety, movement speed was faster. In the plant choice test in the laboratory, as expected, Ghowon was the most chosen but the choice of the other 4 varieties was not different. The same pattern as found in the plant choice test conducted in the greenhouse. Feeding frequency was the highest in Ghowun variety followed by Sumi > Daeri = Seohong > Chubaek in the laboratory test but Ghowun > Sumi > Chubaek > Daeri = Seohong in greenhouse test. When measured in 2 weeks after release, plant damage rates and number of mines were in congruence to the preference results. Further study is needed to clarity the factor responsible for the choice of the plants and also the ways to manage this new pest.
Rameswor Maharjan,Chuleui Jung 한국응용곤충학회 2014 한국응용곤충학회 학술대회논문집 Vol.2014 No.04
Liriomyza leafminer flies comprise a pest group that causes both considerable economic losses and serious quarantine problems. We reported for the first time of the infestation of field crops by this invasive leafminer L. huidobrensis in Korea in 2012. Distribution survey of leafminer flies and other insect pests on potato crops along with associated natural enemies was conducted from 378 farmers' field in most of the potato growing provinces during 2011, 2012 and 2013. Sweeping (10 sweeps/field) and visual inspection were employed within 5 minute-walking distance each field. For damage rate was also calculated for each field. Ten mined leaflets were investigated for parasitoid species identification. Leafminer flies were identified by morphologically and molecular. However, parasitoid species were only morphologically identified. All the leafminer flies collected were identified as L. huidobrensis. No leafminer flies infested fields were recorded in Boseong (Jeollanam-do) in 2011. L. huidobrensis infested fields with unique crop damage symptoms were found only in Miryang and Goryeong (Gyeongsangnam-do) in 2012. There was significant different in leafminer infested fields among the surveyed locations in 2012 (f=85.73, df=5, 127, P<0.0001). Higher damaged (100%) potato fields were recorded in Miryang. Similarly, the leafminer infested potato fields were significantly different among the surveyed locations in 2013 (f=36.77, df=19, 201, P<0.0001). Highest damaged rates (100%) were recorded in all the surveyed locations of Gyeongsangnam-do. Increasing distribution expansion pattern of L. huidobrensis was found. Distribution covers from southern parts to northern parts of the country. The study on rate of distribution and factors responsible in rapid distribution of L. huidobrensis in Korea are demanded.
Liriomyza huidobrensis (Blanchard) (Diptera: Agromyzidae) a new emerging pest in Korean prospective
Rameswor Maharjan,Min Kwon,Ju-Il Kim,Chuleui Jung 한국응용곤충학회 2015 한국응용곤충학회 학술대회논문집 Vol.2015 No.04
The pea leafminer fly, Liriomyza huidobrensis (Blanchard) (Diptera: Agromyzidae), is a polyphagous pest attacking wide range of field and greenhouse crops and ornamental plants. Surprisingly, localized outbreaks with high population and heavy unique damage of leafminers were observed from the field survey of potato fields in the southern parts (Miryand and Goryeong) of Korea in 2012. L. huidobrensis was the responsible for those potato damages based on the morphological and genetic characteristics. Then after, it added a one more emerging species in Korean Liriomyza account. Infestation of L. huidobrensis was expanding and reported in major potato growing areas of the country. Genetic evidence showed the close relationship with Chinese L. huidobrensis population, so it might be invaded from China. As a new emerging pest, very few informations relative to this pest are available in Korean prospective. There is also significant potential for it to widen its distribution, as the Korean Peninsula is a hot spot of climate change, particularly global warming. There are a lot of challenges uprooting infront of researchers and growers. It is demanded to explore new secrets and to be ready to tackle of this invasive pest, L. huidobrensis.
Insecticide‐mediated behavioral avoidance by bean bug, Riptortus pedestris (Heteroptera: Alydidae)
Rameswor Maharjan,정철의 한국곤충학회 2015 Entomological Research Vol.45 No.4
Bean bug, Riptortus pedestris (Fabricius) (Heteroptera: Alydidae), is an economically important pest of soybean and tree fruit. Behavioral responses of R. pedestris to olfactory cues from insecticide‐treated foliage were assessed in a Y‐tube olfactometer. Ten insecticides were applied to kidney bean plants at the recommended dosage, and then bug avoidance was assessed at 0, 3, 5, 7 and 13 days after treatment (DAT). Each bug was allowed 5 min to choose one of the olfactometer's arms. Even though the degree of avoidance was variable to the insecticides tested, bean bugs significantly avoided the insecticide‐treated leaf. The pyrethroid bifenthrin was the most avoided of the insecticides tested. In all treatments, avoidance decreased as DAT increased. Also, the movement speed was higher to the untreated leaf than to the insecticide‐treated leaf. The degree of avoidance was positively correlated to the vapor pressure of the chemical; this finding implies the interaction of the treated chemicals and plant volatiles may be used as cues for bean bug selection of the host‐plant.
Rameswor Maharjan,Soondo Bae,Hwijong Yi,Yoonnam Young,Yunwoo Jang 한국응용곤충학회 2019 한국응용곤충학회 학술대회논문집 Vol.2019 No.04
Nysius is one of the most common and widely distributed species in the world. It is one of the emerging pests of perilla crop in the field in Korea. In this study, we investigated the oviposition preference and development of Nysius plebeius and N. hidakai. on five crops seed (Perilla, Sesame, Proso-millet, Sorghum, and Fox-tail millet) using both multiple choice and no-choice tests. Both results found perilla seeds to be the most suitable seeds for oviposition and development. Total developmental period was shortest on perilla seed, and the longest was on rest of crops seeds. The highest of adult emergence, longevity, and adult weight were occurred on the perilla seed. This results suggest that the higher preference and performance of Nysius spp on the perilla seed. The information may facilitate the exploration of resistant genetic materials chemical associated with seeds for successful breeding program in Korea.