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- 검색키워드
- 저자 : Mainali,Hyun-Ju (검색결과 59 건)
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Mainali, Bishwo P.,Kim, Sang-Won,Lim, Un-Taek 한국응용곤충학회 2012 Journal of Asia-Pacific Entomology Vol. No.
Our previous study demonstrated that the release of refrigerated non-viable eggs of Riptortus pedestris (Fabricius) (Hemiptera: Alydidae) enhanced parasitism rates in soybean fields but did not result in the reduction of R. pedestris populations. This study was further conducted using an open-cage exclusion design in a soybean field in order to evaluate the compatibility of combining releases of non-viable host eggs with a single pre-harvest application of insecticide for the control of R. pedestris. Refrigerated eggs of R. pedestris were released twice in treatment plots, and fresh (<1 day old) eggs of R. pedestris were deployed in all experimental arenas, every 6 days, for host resource and measurement of field parasitism. The releases of host eggs did not reduce the number of R. pedestris in any life stage except the adult stage on two sampling dates. However, parasitism by Gryon japonicum (Ashmead) (Hymenoptera: Scelionidae) was higher in treated plots (9-25%) than in the control plots (1-9%). Statistical significant reduction was not found in the pest population, but parasitism rates significantly increased. Pesticide application did not reduce the bug population but did affect the parasitoids population. Pest management tactics, using both artificially deployed host eggs and insecticide, are discussed.
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Mainali, B.P.,Lim, U.T. 한국응용곤충학회 2016 Journal of Asia-Pacific Entomology Vol. No.
<P>The aggregation pheromone of Riptortus pedestris (Fabricius) (Hemiptera: Alydidae) has a kairomonal effect on its egg parasitoids. The addition of non-viable R. pedestris eggs to aggregation pheromone traps was suggested as a means to enhance reproduction of parasitoids attracted to pheromone traps and was found to enhance field parasitism. In this study, we tested if the eggs added to traps are indeed used by parasitoids for their reproduction. Spatial distributions of egg parasitism were assessed in a barley and a sesame field where non-viable host eggs were installed at four distances (8,16, 24, and 32 m) in two directions from the aggregation pheromone traps placed in the center of each field. While field parasitism increased significantly over time, it decreased with distance from traps. Higher egg parasitism was found up to 16 m from the point of release in both barley and sesame fields. To compare temporal changes in parasitism, traps were also installed in another barley and another sesame field without adding host eggs. From regression slope comparisons, significant differences were found only in the sesame fields, where the parasitism rate on the last sampling date in the egg-released field was higher than the comparison field by 80%. A higher male proportion was found near the trap installation point only for Gryon japonicum (Ashmead) (Hymenoptera: Platygastridae) in the sesame field. These findings suggest that supplemental host eggs in traps enhance field parasitism by increasing the reproduction and dispersion of field populations of parasitoids. (C) 2015 Korean Society of Applied Entomology, Taiwan Entomological Society and Malaysian Plant Protection Society. Published by Elsevier B.V. All rights reserved.</P>
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Use of flower model trap to reduce the infestation of greenhouse whitefly on tomato
Mainali, Bishwo Prasad,Lim, Un-Taek 한국응용곤충학회 2008 Journal of Asia-Pacific Entomology Vol. No.
Flower model trap (FMT) made from artificial yellow chrysanthemum flower coated with sticky material was originally developed to attract anthophilous Frankliniella thrips species. During evaluation of the FMT in a strawberry greenhouse, it was also found to attract higher number of greenhouse whitefly, Trialeurodes vaporariorum Westwood (Homoptera: Aleyrodidae), compared to the conventional yellow sticky trap. The color cue exhibited by the petals and/or geometrical pattern of the flower models might have tempted the whitefly to land on them. Therefore, we assessed the potential of the FMT as a novel pest management tactic for T. vaporariorum. In laboratory comparison test in an acryl cage, the FMT captured adult whiteflies 1.8 times more than did the yellow sticky trap. Installation of 80 FMTs in a <TEX>$500m^2$</TEX> commercial tomato greenhouse significantly reduced the adult population of T. vaporariorum. Sooty mold infestation was also reduced by 85% on the greenhouse fruits. Similarly less sooty mold infestation was found on the harvested tomato fruits from the trap-equipped greenhouse. Although no significant reduction in the nymphal population of T. vaporariorum was observed, the FMT employed with timely installation and replacement could be another useful greenhouse tomato pest management tactic for T. vaporariorum.
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Evaluation of different leguminous seeds as food sources for the bean bug Riptortus pedestris
Bishwo P. Mainali,김현주,윤영남,오인석,배순도 한국응용곤충학회 2014 Journal of Asia-Pacific Entomology Vol.17 No.2
This studywas conducted to determine the effects of six different leguminous seeds (cowpea,white kidney bean,soybean cultivars Cheongja and Daepung, mung bean, and azuki bean) on the life history traits of the bean bugRiptortus pedestris (F.) (Hemiptera: Alydidae). The total developmental time from the first instar nymph toadult ranged from 18 to 25 d; R. pedestris fed with white kidney beans were the slowest to develop. In addition,bugs fed with white kidney beans had the highest mortality (93%) and the shortest longevity (18 d). R. pedestrisfedwith cowpeas, soybeans, or azuki beans had high reproductive success, with the highest egg hatching successrecorded in bugs fed cowpeas. The results suggest that cowpea may be a beneficial food source for the developmentand reproduction of bean bugs.
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Bishwo P. Mainali,Un Taek Lim 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.05
Ooencyrtus nezarae Ishii (Hemiptera: Encyrtidae) and Gryon japonicum Ashmead (Hymenoptera: Scelionidae) are two important egg parasitoids of soybean stink bug Riptortus clavatus, one of the most serious pests in Korea. On the verge of increasing severity of R. clavatus damage in other crops, now it is important to know temporal distribution of R. clavatus and its parasitoids throughout cultivation season of various crops. Seasonal occurrence of R. clavatus and its egg parasitoids is well studied in soybean. However, occurrence of spring populations has not been fully investigated. Therefore we placed pheromone trap with refrigerated eggs in barley and early soybean fields to record occurrence of both R. clavatus and its’ egg parasitism rate in 2008. Number of R. clavatus attracted in the trap was recorded every week, and host eggs collected same time were brought into laboratory for investigation of parasitism. R. clavatus was found to exist in barley on the first day of trap installation, i.e., May 11th. Number of R. clavatus reached highest level after mid July. Only G. japonicum emerged from the eggs collected from barley field whereas O. nezarae was dominant species emerged from the host eggs collected from soybean field. We found that not only R. clavatus infestation but parasitoid occurrence begins in early spring barley field.
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Bishwo Prasad Mainali,Un Taek Lim 한국응용곤충학회 2016 Journal of Asia-Pacific Entomology Vol.19 No.1
The aggregation pheromone of Riptortus pedestris (Fabricius) (Hemiptera: Alydidae) has a kairomonal effect on its egg parasitoids. The addition of non-viable R. pedestris eggs to aggregation pheromone traps was suggested as a means to enhance reproduction of parasitoids attracted to pheromone traps and was found to enhance field parasitism. In this study, we tested if the eggs added to traps are indeed used by parasitoids for their reproduction. Spatial distributions of egg parasitism were assessed in a barley and a sesame field where non-viable host eggswere installed at four distances (8, 16, 24, and 32m) in two directions fromthe aggregation pheromone traps placed in the center of each field.While field parasitismincreased significantly over time, it decreasedwith distance fromtraps. Higher egg parasitismwas found up to 16mfrom the point of release in both barley and sesame fields. To compare temporal changes in parasitism, traps were also installed in another barley and another sesame field without adding host eggs. From regression slope comparisons, significant differences were found only in the sesame fields,where the parasitismrate on the last sampling date in the egg-released fieldwas higher than the comparison field by 80%. A higher male proportion was found near the trap installation point only for Gryon japonicum (Ashmead) (Hymenoptera: Platygastridae) in the sesame field. These findings suggest that supplemental host eggs in traps enhance field parasitismby increasing the reproduction and dispersion of field populations of parasitoids.
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Bishwo Prasad Mainali,Young-il Kim,Man-Woong Park,Un Taek Lim 한국응용곤충학회 2010 한국응용곤충학회 학술대회논문집 Vol.2010 No.10
In a previous study, aggregation pheromone trap added with refrigerated eggs of Riptortus pedestris (Fabricius) (Hemiptera: Alydidae) in a netted pouch was found to enhance parasitism by its egg parasitoid Ooencyrtus nezarae Ishii (Hymenoptera: Encyrtidae) in soybean fields. However, the eggs released in the netted pouch would not be well exploited by the egg parasitoid due to reduced encounter of the eggs and elevated inter- or intraspecific competition among the parasitoids in clumped condition of released eggs inside the pouch. To solve this problem, new trap was developed with twelve separate cells for egg placement. Efficiency of this new trap was evaluated in a soybean field in Songcheon, Andong. Newly developed trap and formerly designed trap each with 180 refrigerated eggs were placed at a distance of 15-20m in the field. The released eggs were collected every week, and the experiment was replicated for three weeks. In addition, comparison was carried out by placing eggs in different density in the cell (120 in total per trap) for three weeks. Parasitism in newly developed trap (32-35%) was higher than that in the former trap (16-20%). Parasitism in the trap where eggs were released in six cells was the highest, followed by three cells, one cell, and eggs released in the pouch. From these findings, newly developed traps is better than previous design in enhancing the parasitism in soybean fields.
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Bishwo P. Mainali,Sangwon Kim,임언택 한국응용곤충학회 2012 Journal of Asia-Pacific Entomology Vol.15 No.2
Our previous study demonstrated that the release of refrigerated non-viable eggs of Riptortus pedestris (Fabricius) (Hemiptera: Alydidae) enhanced parasitism rates in soybean fields but did not result in the reduction of R. pedestris populations. This study was further conducted using an open-cage exclusion design in a soybean field in order to evaluate the compatibility of combining releases of non-viable host eggswith a single pre-harvest application of insecticide for the control of R. pedestris. Refrigeratedeggs of R. pedestris were released twice in treatment plots, and fresh (b1 day old) eggs of R. pedestris were deployed in all experimental arenas,every 6 days, for host resource and measurement of field parasitism. The releases of host eggs did not reduce the number of R. pedestris in any life stage except the adult stage on two sampling dates. However, parasitism by Gryon japonicum (Ashmead) (Hymenoptera: Scelionidae) was higher in treated plots (9–25%) than in the control plots (1–9%). Statistical significant reduction was not found in the pest population, but parasitism rates significantly increased. Pesticide application did not reduce the bug population but did affect the parasitoids population. Pest management tactics, using both artificially deployed host eggs and insecticide, are discussed. © Korean Society of Applied Entomology, Taiwan Entomological Society andMalaysian Plant Protection Society,
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