• Title, Summary, Keyword: Riptortus pedestris

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Damage Reduction Effect and Attracted Distance by Aggregation Pheromone Trap of the Bean Bug, Riptortus pedestris (Fabricius), (Hemiptera: Alydidae) in Soybean Fields (콩 포장에서 집합페로몬 트랩을 이용한 톱다리개미허리노린재 (Riptortus pedestris) 유인거리 및 피해 경감 효과)

  • Park, Chang Gyu;Yum, Ki Hong;Jung, Jin Kyo
    • Korean journal of applied entomology
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    • v.51 no.4
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    • pp.411-419
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    • 2012
  • The lure-distance of Riptortus pedestris aggregation pheromone was elucidated and the damage mitigation effect by mass trapping of R. pedestris was examined in commercial soybean fields. The recaptured ratio showed that 76.1% of total recaptured individuals were lured within 40 m and 89.0% of total recaptured adults were arrested in the lower 80 m. There is not much difference in the number of recaptured individuals according to the location of installed traps in the experiment. There was linear correlation between the total installed number of traps and the total number of trapped individuals in commercial soybean fields. and the highest yield (261.8 g/10 stems) was investigated in the field that had installed a pheromone trap per $770m^2$. No relationship wasf found between the covered areas of a pheromone trap for mass trapping and yield loss. The ratio of type A seed (healthy) was higher in the field that installed a trap per $385m^2$ and $770m^2$ (around 62%) and type B seed (showing distinct injury marks) was lower in the same fields (around 27%). From this result, we could reduce slightly the damage of soybean seeds by the mass trapping of Riptortus pedestris adults with an aggregation pheromone trap per $385{\sim}770m^2$ area range.

Occurrence and Control Method of Riptortus pedestris (Hemiptera: Alydidae): Korean Perspectives (국내 톱다리개미허리노린재의 발생과 방제법)

  • Lim, Un Taek
    • Korean journal of applied entomology
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    • v.52 no.4
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    • pp.437-448
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    • 2013
  • Hemipteran bugs, which were previously considered as secondary pests, have currently become important pests of numerous crops. Among them, Riptortus pedestris (Fabricius) is a major species that occurs in Korea, Japan, China, and South Asian countries. Riptortus pedestris infests leguminous crops like soybean, vetches, and red clover; fruit trees like persimmon and yuju; and grains like barley, foxtail millet, broomcorn, and sorghum. Riptortus pedestris causes the greatest damage to soybean, as it is the most suitable host for the bug. Feeding damage during pod formation significantly reduces the yield of soybean. Currently, 17 insecticides, including diazinon and etofenprox, are registered for the control of hemipteran bugs in Korea, and growers apply insecticides two to three times on a regular basis. Aggregation pheromone traps are widely used as a monitoring tool and partial control measure. The aggregation pheromone of R. pedestris attracts conspecific adults and nymphs and is used for food exploitation rather than sexual attraction. In addition, the pheromone serves as a kairomone for egg parasitoids such as Gryon japonicum (Ashmead) and Ooencyrtus nezarae Ishii. As a new method of pest management, nonviable host eggs were included in the pheromone trap to catch R. pedestris and propagate parasitoids. As a part of cultural practices, resistant soybean varieties with specific color and size of pod and control of flowering time through the alteration of planting date can be used. For the effective management of R. pedestris in the near future, development of cultural practices that can support natural control factors and the use of multiple control tactics are needed.

A facile synthesis of (E)-2-hexenyl (E)-2-hexenoate and (E)-2-hexenyl (Z)-3-hexenoate, pheromone components of Riptortus pedestris (톱다리개미허리노린재 페로몬, (E)-2-hexenyl (E)-2-hexenoate과 (E)-2-hexenyl (Z)-3-hexenoate의 합성)

  • Kim, Junheon;Park, Chung Gyoo
    • The Korean Journal of Pesticide Science
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    • v.17 no.2
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    • pp.140-143
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    • 2013
  • We investigated optimal condition for synthesis of (E)-2-hexenyl (E)-2-hexenoate (1) and (E)-2-hexenyl (Z)-3-hexenoate (2), the pheromone components of Riptortus pedestris, by Steglich esterification. The reaction with 1.1-1.5 equivalent of dicyclohexylcarbodiimide (DCC), 1.5-2.0 equivalent of (E)-2-hexenol, and 0.1 equivalent 4-dimethylaminopyrinde (DMAP) to (E)-2-hexenoic acid in toluene or (Z)-3-hexenoic acid in dichloromethane led 1 and 2 in 76-78% and 87-91% yield, respectively.

Predicting the Occurrence of Generation for Riptortus pedestris (Fabricius) Using Their Body Color (톱다리개미허리노린재의 체색변이를 이용한 발생세대 예측)

  • Lee, Hyoseok;Jung, Jong-Kook;Im, Jae Seong;Park, Marana;Lee, Seunghyun;Lee, Joon-Ho
    • Korean journal of applied entomology
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    • v.54 no.4
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    • pp.431-435
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    • 2015
  • Riptortus pedestris (Fabricius) is one of the important insect pests of leguminous crops, which occurs in most areas of South Korea. It is hard to distinguish each generation in crop fields since not only the longevity of adult R. pedestris is long but also the developmental period is short. Especially, the 2nd generation adults cause enormous damage to soybean while the occurrence time is synchronized with the podding stage of soybean. Controlling the 1st generation of R. pedestris helps to decrease the damage by decreasing the 2nd generation density. This study was conducted to distinguish between the 1st generation and the overwintering generation by using differences in body coloration which is dependent on the day-length during the nymph stage. In addition, the difference was verified by the population dynamics model of R. pedestris. The occurrence time of 1st generation adults could be considered when the summer form is 20% or more. These results will be used for beneficial management decisions to reduce the 2nd generation population.

Environmentally-friendly control of Riptortus pedestris (Hemiptera: Alydidae) by environmental friendly agricultural materials (친환경농자재를 이용한 톱다리개미허리노린재의 친환경적 방제)

  • Kwon, Hye-Ri;Kim, Sae-Hee;Park, Min-Woo;Jo, Shin-Hyuk;Shin, Hyo-Seob;Cho, Hyeoun-Suk;Seo, Mi-Ja;Yu, Yong-Man;Youn, Young-Nam
    • Korean Journal of Agricultural Science
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    • v.38 no.3
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    • pp.413-419
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    • 2011
  • Recently, the rate of cultivation of such as hairy vetch was increased as a way of reducing the current soil problem. However, the occurrence of insect pest such as bean bugs, Riptortus pedestris, were increased in the field of green manure crops and their injuries to hairy vetch were observed. While minimizing insecticide use for the environmental friendly agriculture, the control of the bean bug can be utilized environmental friendly agricultural materials (EFAMs) in the green manure crop fields. The control effects of some EFAMs and most of chemical insecticides to the bean bug were significantly high. As a result of direct spray of EFAM that contained sophora extract or neem extract, the control effects of six EFAMs were higher than 70% at 120 hours after treatments. Among them, three EFAMs were showed over 90% of control effects. On the other hand, most of chemical insecticides were showed 100% of control effect against the bean bug at 48 hours after treatment. As mortality effects of EFAMs were sloely observed until 120h after treatment, we must use selected EFAMs at the beginnibgs of occurrence and entrance in the field of green manure for effective control of bean bugs.

Construction and Evaluation of Cohort Based Model for Predicting Population Dynamics of Riptortus pedestris (Fabricicus) (Hemiptera: Alydidae) Using DYMEX (상용소프트웨어(DYMEX)를 이용한 톱다리개미허리노린재(Riptortus pedestris) 밀도 변동 양상 예측 모델 구축 및 평가)

  • Park, Chang-Gyu;Yum, Ki-Hong;Lee, Sang-Ku;Lee, Sang-Guei
    • Korean journal of applied entomology
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    • v.54 no.2
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    • pp.73-81
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    • 2015
  • A Cohort based model for temperature-dependent population dynacmics of Riptortus pedestris was constructed by using a commercial software (DYMEX) and seasonal occurrence along with pesticide treatments effect was simulated and validated with pheromone trap data. Ten modules of DYMEX software were used to construct the model and Lifecycle module was consisted of seven developmental stages (egg, 1 - 5 nymphal instars, and adult) of R. pedestirs. Simulated peaks of adult populations occurred three or four times after the peak of overwintered populations which was similar to those observed from pheromone trap catch. Estimated dates for the second peak were quite similar (1-2 day difference) with those observed with pheromone trap. However, the estimated dates for the first population peak were 9-16 days later than the observed dates by pheromone trap and the estimated dates for the last peak were 17-23 days earlier than the observed dates. When insecticide treatments were included in the simulation, the biggest decrease in R. pedestris adult density occurred when insecticide was applied on July 1 for the first peak population: the estimated adult density of the second peak was 3% of untreated population density. When insecticide was assumed to be applied on August 30 for the second peak population, the estimated adult density of the following generation was about 25% of untreated population and the peak density of the following generation reached about two weeks later than untreated population. These results can be used for the efficient management strategies for the populations of R. pedestris.

Insecticidal Effect of Aggregation Pheromone Fish Net Trap using Residual Effect of Insecticides Against Bean Bug, Riptortus pedestris (Hemiptera: Alydidae) (살충제의 잔효성을 이용한 집합페로몬통발트랩에 유인된 톱다리개미허리노린재의 살충효과)

  • Lee, Seon-Woo;Yun, Seung-Hwan;Koo, Hyun-Na;Kim, Hyun Kyung;Youn, Young-Nam;Kim, Gil-Hah
    • The Korean Journal of Pesticide Science
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    • v.17 no.3
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    • pp.206-212
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    • 2013
  • This study was examined for activity of aggregation pheromone fish net trap with residual effect of insecticides against Riptortus pedestris. Time of escape was from aggregation pheromone fish net trap researched 49.74 min ($ET_{99}$) and 65.01 min ($ET_{99}$) with 1st and 2nd instar nymph respectively. Six insecticides for the stink bugs were treated to 3 different materials (wood, metal and plastic). Bifenthrin and fenitrothion were showed 100% insecticidal activity at 48 h to all developmental stage of R. pedestris. Residual effect of bifenthrin and fenitrothion on plastic material were showed 100% insecticidal activity over 15 day after treatment with 1st, 3rd instar nymphs and adults except 5th instar nymph. In field test using plastic material trap with two pesticides, 1st instar nymphs and adults were showed 100% mortality until 10 day after treatment. These results indicate that R. pedestris might be managed using aggregation pheromone trap with insecticides.

Seasonal Occurrence, Development and Preference of Riptortus pedestris on Hairy Vetch (헤어리베치에서 톱다리개미허리노린재 발생양상 및 기주에 따른 발육 및 선호성)

  • Seo, Mi-Ja;Kwon, Hye-Ri;Yoon, Kyu-Sik;Kang, Min-A;Park, Min-Woo;Jo, Shin-Hyuk;Shin, Hyo-Seob;Kim, Sae-Hee;Kang, Eun-Jin;Yu, Yong-Man;Youn, Young-Nam
    • Korean journal of applied entomology
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    • v.50 no.1
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    • pp.47-53
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    • 2011
  • The seasonal occurrence of Riptortus pedestris Fabricius was investigated using pheromone traps baited with its aggregation pheromone in the fields with various crop composition (mixture culture of barley and hairy vetch in Asan, Chungnam; monoculture of hairy vetch in Yuseung, Daejeon) from mid-May to mid-July of seed gathering season in 2010. The invasion of R. pedestris into the experimental fields began to increase rapidly from late-June in which period hairy vetch and barley reach the beginning of seed formation stage. After seed gathering season in mid-July, the invasion rate of R. pedestris decreased, and the activity was continually observed till early-November. In addition to dominant R. pedestris species, 33 species of hemiptera including Apolyaus watajii, Dolycoris baccarum, Adelphocoris suturalis, and Yemma exlis were collected, which indicated abundant species diversity in the hairy vetch fields. In the laboratory, R. pedestris did not developed successfully to adult stage on food sources of hairy vetch, with decreasing survival rate after 4th instar and the failure of emergence to adult stage. Also, R. pedestris showed higher preference on soybeans than hairy vetch. Consequently, hairy vetch may be not true host for the development and survival of R. pedestris. It is considered that R. pedestris is a temporary visitor at the season of seed formation in hairy vetch fields.

Seasonal Fluctuation of Riptortus pedestris (Hemiptera: Alydidae) in Chungbuk Province (충북지역 톱다리개미허리노린재의 발생밀도 변동과 이동)

  • Shin, Youn-Ho;Yun, Seung-Hwan;Park, Young-Uk;An, Jeong-Jin;Yoon, Chang-Mann;Youn, Young-Nam;Kim, Gil-Hah
    • Korean journal of applied entomology
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    • v.51 no.2
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    • pp.99-109
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    • 2012
  • Seasonal fluctuations of Riptortus pedestris were investigated in four regions including two sites each at Mt. Yangseong (Munui-myeon, Cheongwon-gun), O-chang (Cheongwon-gun), and Jujung-dong (Cheongju) using aggression pheromone traps from April to November in 2010 and 2011. Aggression pheromone and aggression pheromone + soybean traps were set at all investigated sites, and the Mt. Yangseong A and B sites were investigated at a farmland (80 m, asl) and forest (200 and 300 m). The population density of R. pedestris was high in mid June, mid August, and late October in 2010 and in early May, mid June, mid September, and early October in 2011 with trivoltine. O-chang and Jujung-dong populations, which were distinguished in farmlands and forests, were highest from June to August in the farmland and in September in the forest. Similar numbers of R. pedestris were capture in the farmlands and the forest in June-August, September-November, respectively. From the results of the four regions, more R. pedestris adults were captured in the aggression pheromone + soybean trap than that in the pheromone trap. To investigate the migration route by altitude, 500 R. pedestris adults marked with fluorescent paint were released and re-caught insects were counted in traps after 10 and 20 days. The pattern of the re-caught R. pedestris indicated migration from the forest to farmlands during April-June. These results suggest that the insects did not migrate in August because food was plentiful in the forest at 200 m, but they moved to the forest during October due to the scarcity of food and for overwintering. The R. pedestris seasonal fluctuations in 2011 were affected heavily by the environment, particularly rain precipitation.

Injury of Full Seed Stage Soybeans by The Bean Bug, Riptortus pedestris (콩 종실비대성기에 톱다리개미허리노린재 가해에 의한 피해 해석)

  • Jung, Jin-Kyo;Seo, Bo-Yoon;Youn, Jong-Tag;Park, Jong-Ho;Cho, Jum-Rae
    • Korean journal of applied entomology
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    • v.49 no.4
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    • pp.357-362
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    • 2010
  • Soybean seed injury was analyzed in the experiments in which the bean bug, Riptortus pedestris(Hemiptera: Alydidae), was released into screen-caged pots containing full seed stage(R6) of soybean. When the different stages of insects, from the 3rd instar nymphs to adults, were released into pots during 8 days in soybean R6 stage, soybean seeds with injury marks (B-type seeds) increased. The weight reduction ratio in B-type seeds was highest in the injury by the 5th instar nymphs, while the daily-produced number ratio of B-type seeds was small in the treatment. In the injury by the different number of adult released into pots, 4, 8, 16 adults caused a significant increase of B-type seeds, while 16 adults caused the significant increase of the deformed (C-type) seeds. In the injury by the different release period of adults, the total number of pods was not significantly different among treatments, while the total seed number harvested was significantly small in the release for 48 days. The release for 8 and 16 days caused a significant increase of B-type seeds, while the release for 48 days caused the increase of C-type seeds. The results indicated that injury of soybean R6 stage by the bean bug produced soybean seeds with distinct injury marks at relatively low density and during short term attack period, while it produced deformed seeds at high density and during long attack period.