• Title/Summary/Keyword: Parasitism rate

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Species Composition and Seasonal Distribution of the Endoparasitoids on Acronicta rumicis (Lepidoptera, Noctuidae)

  • Cho, Young-Ho;Kwon, Oh-Seok;Nam, Sang-Ho
    • Journal of Ecology and Environment
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    • v.29 no.1
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    • pp.55-60
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    • 2006
  • Forty six individuals out of 200 Acronicta rumicis larva were parasitized (23 %) in 2000, 14 individuals out of 60 (23.33 %) in 2001, and 14 individuals out of 62 (22.58 %) in 2002. The mean parasitism rate was $22.97{\pm}0.38%$. The parasitism rate was 36.36 % in May and 52.78 % in October, 2000, 75 % and 50% in May and October 2001, 71.4% and 47.37% in May and October 2002 and it was much higher than other months. Parasitism was occurred from May to October 2000, but it was not in June and August 2001 and June 2002. There was no difference in the monthly mean parasitism rate, but the rate was the highest in May and October. The parasitoid of the larva of A. rumicis was the highest by 77.02% of parasitic wasps, and 13.51% of parasitic flies. It was found that multiparasitism was 4.05 % and hyperparasitism was 5.41 %. In case of parasitic wasps whose parasitism rate is the highest, the rate of Braconidae and Ichneumonidae was 70.18 % and 29.82 % respectively. That is, the former has much higher parasitism rate. The parasitism rate of the larva of A. rumicis was found that Microplitis sp. is $5.28{\pm}0.63%$, Glyptapanteles liparidis $8.62{\pm}3.70%$, and Diadegma sp. $4.02{\pm}1.28%$ respectively.

Wing Morphs and Parasitism Rates of the Small Brown Planthopper, Laodelphax striatellus (Hemiptera: Delphacidae) in Korea (국내 애멸구 (Laodelphax striatellus Fallen) (노린재목: 멸구과)의 시기별 날개형 및 기생율)

  • Son, Byung-In;Jung, Jong-Kook;Lee, Joon-Ho
    • Korean journal of applied entomology
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    • v.53 no.4
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    • pp.497-501
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    • 2014
  • The small brown planthopper, Laodelphax striatellus (Fall$\acute{e}$n) (SBPH) is one of the important rice pests in Korea, which transmits rice stripe virus (RSV) to rice. This pest is an indigenous species in Korea and has also known to migrate from China to the western coastal areas of Korea. This study was conducted to investigate the wing morphs of SBPH and its parasitism rate of Haplogonatopus atratus Esaki et Hashimoto in Korea. In 2014, SBPH were collected in April and July from 16 sites throughout South Korea and their wing morphs and parasitism rates were measured under the microscope. Percentage of brachypterous male in July was significantly declined compared to that in April, while that of brachypterous female did not change. A positive relationship was found between latitude and percentage of brachypterous adults in April. Parasitism rate of both nymphs and adults were higher in April than July. In addition, nymphal parasitism rate was generally higher in western coastal areas.

Parasitism Rate of Egg Parasitoid Anastatus orientalis (Hymenoptera: Eupelmidae) on Lycorma delicatula (Hemiptera: Fulgoridae) in China (중국에서 알기생봉 Anastatus orientalis (Hymenoptera: Eupelmidae)의 꽃매미 Lycorma delicatula (Hemiptera: Fulgoridae) 알에 대한 기생율)

  • Choi, Man-Young;Yang, Zhong-Qi;Wang, Xiao-Yi;Tang, Yan-Long;Hou, Zhen-Rong;Kim, Jeong Hwan;Byeon, Young Woong
    • Korean journal of applied entomology
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    • v.53 no.2
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    • pp.135-139
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    • 2014
  • Anastatus orientalis Yang et Gibson(Hymenoptera : Eupelmidae) is the egg parasitoid of lantern-fly Lycorma delicatula. The natural parasitism showed that: (1)the highest parasitism rate of egg masses was 68.96% in Yantai Shandong; (2)the highest parasitism rate of eggs was 32.98% in Haidian Beijing; (3)the eggs of parasitoids hatched and emerged earliest in Yangling Shaanxi; emergence time of different populations in Yantai, Guangang Tianjin, Qinhuangdao Hebei and Haidian was similar; (4) the sex ratios were various among the populations ranging from 1.92 to 1.94; (5) parasitism rates of egg masses on Populus sp., Salix sp. and Toona sinensis were not significantly different, the highest parasitism rate of egg masses was 64.3% on T. sinensis, and the lowest rate was 27.4% on Ailanthus altissima; (6)parasitism rates of eggs on Populus sp., Salix sp., T. sinensis and A. altissima were not significantly different, about 30% averagely.

Parasitoid Complex of the Gypsy Moth (Lymantria dispar) in the Increase-phase Populations in Korea

  • Lee, Jang-Hoon;Pemberton, Robert W.
    • Journal of Ecology and Environment
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    • v.32 no.2
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    • pp.75-81
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    • 2009
  • The species composition of the parasitoid complex and the degree of parasitism by each species were analyzed for gypsy moth (Lymantria dispar) populations in the increasing phase. Total of 7,826 mid-late instar larvae and pupae were collected and reared from two collection sites in Gangwon Province, Korea. Two tachinid flies (Blepharipa schineri and Parasetigena silvestris), and the ichneumonid wasp (Coccygomimus disparis) were the most abundant parasitoids, in the order of decreasing importance. Other parasitoids occurring included Coteisa melanoscelus, Cotesia scheaferi, Glyptapanteles liparidis, Brachymeria lasus, and Exorista spp. The low incidence of the NPVirus is hypothesized to be an important factor in determining degree of parasitism rate by P. silvestris and B. schineri, and their relative dominance in the parasitoid complex.

Influence of Aggregation Pheromone of Riptortus clavatus (Heteroptera: Alydidae) on the Occurrence of Egg Parasitoid, Gryon japonicum (Hymenoptera: Scelionidae) (톱다리개미허리노린재의 집합페로몬이 노린재검정알벌의 발생에 미치는 영향)

  • Paik, Chae-Hoon;Kang, Seok-Min;Jeon, Yong-Kyun;Lee, Geon-Hwi;Choi, Man-Young;Oh, Young-Jin;Park, Chung-Gyoo;Hwang, Chang-Yeon
    • Korean journal of applied entomology
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    • v.48 no.1
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    • pp.67-72
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    • 2009
  • The kairomonal activity of the aggregation pheromones of Riptortus clavatus for the egg parasitoid, Gryon japonicum, were investigated in soybean field. The parasitism rate of G. japonicum gradually decreased when the distances between pheromone traps and egg sites were increased from 0 to 15 m. The active distance of pheromone source for parasitoid attraction was estimated to be ca. 15 m. Under field conditions, the parasitoid wasp population peaked during the late August and early September, and the parasitism rate increased when the number of pheromone traps was increased from one to three per $165\;m^2$. However, insecticide-treated plots, the level of parasitism recorded is relatively low. Sex ratios in field populations of G. japonicum were female-biased.

Natural parasitism of parasitoids on Phyllocnistis citrella (Lepidoptera: Gracillaridae) in Jeju citrus orchards in Korea (제주 감귤원에서 귤굴나방에 대한 포식 기생자 천적의 자연 기생율)

  • Hyun, Seung Young;Lim, Un Taek;Kim, Dong-Soon
    • Korean journal of applied entomology
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    • v.58 no.4
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    • pp.299-303
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    • 2019
  • This study was conducted to investigate the species of native parasitoids attacking Phyllocnistis citrella and their parasitism in citrus orchards in Jeju, Korea. During the survey period from 2013 to 2014, seven parasitoids belonging to Chalcidoidea were found: majority of the parasitoids were Sympiesis striatipes with 73% and Quadrastichus sp. with 22% in Eulophidae. The others were Neochrysocharis sp., Pnigalio sp., Holcopelte sp., Ageniaspis sp. (Encyrtidae) and Trichomalopsis sp. (Pteromalidae). Average parasitism rate reached 10.7% in orchards with spraying insecticide, and 32.2% in environmental-friendly managed orchards.

Egg Parasitism of Green Rice Leafhopper, Nephotettix cincticeps Uhler by Gonatocerus sp. and Paracentrobia andoi in Southern Rice Cultural Areas (남부지방에 있어서 끝동매미충 난기생봉의 종류 및 기생율에 관한 조사연구)

  • Chang Y.D.
    • Korean journal of applied entomology
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    • v.19 no.2
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    • pp.109-112
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    • 1980
  • This study was carried out to investigate the distribution of egg parasitoids from green rice leafhopper, Nephotettix cincticeps Uhler, from the middle of August through the early September in southern rice cultural areas. The results were obtained as follow. 1. Four species of egg parasitoids, Gonatocerus sp. A and B, Paracentrobia andoi and Anagrus sp. are newly recorded from the eggs of green rice leafhopper. 2. Egg parasitism rates of Gonatocerus sp. were varied from $41.0\~73.9\%$ on an egg mass basis and from $29.7\~49.0\%$ on basis of egg. Percent parasitism rates by Paracentrobia andoi were $0\~9.7\%$ on an egg mass basis and from $2.1\~12.6\%$ on basis of egg. Gonatocerus sp. was dominant egg parasitoid in the parasitism rate than Paracentrobia andoi.

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Ecological Characteristics of Cotesia glomerata L. (Hymenoptera: Braconidae) and Its Parasitism Rates for Diamondback Moth (Plutella xylostella L.) in a Kimchi Cabbage Field in The Korean Highland Area (배추나비고치벌(Cotesia glomerata L.)의 생태적 특성 및 고랭지 배추밭에서 배추좀나방(Plutella xylostella L.)에 대한 기생률)

  • Kwon, Min;Kim, Juil;Hong, Eunju;Lee, Yeonggyu
    • Korean journal of applied entomology
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    • v.58 no.4
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    • pp.355-362
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    • 2019
  • Cotesia glomerata L., an internal parasitoid wasp, attacks the larvae of both the cabbage white butterfly (Artogeia rapae L.) and the diamondback moth (Plutella xylostella L.). It can be utilized as a natural biological enemy to control these two insect pests in the summer cabbage fields of the Korean highland areas. The developmental response and sex ratio of C. glomerata to various temperatures and its longevity were examined in the laboratory. The egg-to-larva and pupa stages of C. glomerata were 12.1 ± 2.1 and 6.4 ± 1.8 days, respectively, at 20℃, The developmental threshold for egg-to-larva and pupa stages were 7.7 and 8.5℃, respectively. The sex ratios of C. glomerata when reared under various temperatures were 61.0 ± 4.5% at 15℃, 44.2 ± 1.0% at 20℃, and 39.0 ± 2.3% at 25℃, and the incidence of females increased as the temperature decreased. The longevity of C. glomerata when fed a 10% sugar solution was 20.4 ± 0.2 days, while in adults without any feed, the longevity was 3.6 ± 0.1 days. Indoor reared C. glomerata adults were released into cabbage fields from 2007 to 2018, in early August of each year, and the outdoor parasitism rates were surveyed. The parasitism rates were found to increase gradually as the year passed (Y = 0.2696X + 2.8633, R2 = 0.3994). The highest parasitism rate was observed in 2013 at 7.6%, and the lowest was in 2018 at 6.5 %. These results could be used as basic information for biological control of kimchi cabbage pests at highland fields.

Effects of Photoperiod on Oviposition and Emergence of Egg Parasitoid, Trichogramma dendrolimi Mastumura (Hymenoptera, Trichogrammatidae) (광조건이 송충알벌(벌목, 알벌과)의 산란과 우화에 미치는 영향)

  • 박영규;이해풍;이기상;한만위;이정운
    • Korean journal of applied entomology
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    • v.38 no.2
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    • pp.93-99
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    • 1999
  • We investigated the effect of constant photoperiod (16L : 8D, 12L : 12D, 8L : 16D), on the oviposition, parasitism, and emergence of Trichogramma dendrolimi. Also during 16L : 8D condition circadian, oviposition and emergence of this species on artificial eggs were checked every 2hrs. When twelve eggs of Antheraea pern~i and artificial eggs were provided, the wasps had the highest rate of oviposition in the first day, and decreased dramatically there after. In these different photoperiod, the total oviposition numbers per A. pernyi eggs by the wasp were 161.8 in 16L : 8D, 145.8 in 121 : 12D and 128.5 in 8L : 16D respectively in the first day. On the other hand for the artificial egg in 16L : 8D photoperiod, the total oviposition number per egg was 106.8 in the first day, 26.6 in the 2nd day and 21.3 in the 3rd day. The rate of emergence from A. pernyi eggs was not different depend on wasp's day age, however in the artificial eggs, after the first day's 84.7% decreased considerably. The emergence rate from artificial eggs was the highest comparatively between 04:OO-0600 hours.

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Studies on the Parasitoids of Chestnut Gall Wasp, Dryocosmus kuriphilus Yasumatsu (Hymenoptera : Cynipidae) in Korea (밤나무혹벌의 기생천적(寄生天敵)에 관(關)한 연구(硏究))

  • Kim, Jong Kuk
    • Journal of Korean Society of Forest Science
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    • v.87 no.3
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    • pp.475-482
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    • 1998
  • 9 species of parasitoids emerged from chestnut gall samples collected at Chunchon, Kangwon in June to July 1995 - 1997, and 8 species emerged from gall samples at the 5 investigation sites in December 1997. The primary parasitoids among them were Torymus sinensis, Torymus geranii, Sycophila variegata, Megastigmus nipponicus, Megastigmus maculipennis, Eurytoma brunniventris, Ormyrus flavitibialis, Ormyrus punctiger, Eupelmus urozonus, while the secondary parasitoids were Torymus geranii, Sycophila variegata, Eupelmus urozonus, Eupelmus sp., Eurytoma setigera, Ormyrus punctiger. Torymus sp.. Some of secondary parasitoids were facultative hyperparasitoids, parasitizing the gall wasp as well as primary parasitoids, Among these natural enemies, Torymus sinensis was dominant at all sites. At Chunchon, the rate of gall formation showed decreasing tendency as the function of generation and the parasitism rate of Torymus sinensis showed increasing tendency gradually. But the rate of parasitization of the secondary parasitoids(Sycophila variegata, Eupelmus urozonus, Torymus geranii, Ormyrus puntiger) ranged from 4.0% to 10.5%. The mortality was high during June to October which was immature stage of Torymus sinensis, and mainly caused by secondary parasitoids. Torymus sinensis emerged from April to May and the estimated dates of 50% emergence was 21st April. The estimated dates of 50% emergence for the other, Sycophila variegata, Eupelmus urozonus, Torymus geranii, and Ormyrus puntiger were 25th April, 30th April, 4th May, and 22nd May, respectively.

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