간행물
한국응용곤충학회지 KCI 등재 Korean Journal of Applied Entomology
- 발행기관 한국응용곤충학회
- 자료유형 학술지
- 간기 계간
- ISSN 1225-0171 (Print)2287-545X (Online)
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Vol. 51 No. 1 (2012년 3월) 10건
1.
2012.03
구독 인증기관 무료, 개인회원 유료
, , Silver-grey or dark brown scaring, or dark brown discolored damages caused by the yellow tea thrip, Scirtothrips dorsalis Hood (Thysanoptera: Thripidae) have occurred on citrus fruits cultivated in the open field in east-south area orchards of Jeju Island since 2007. The weekly population of yellow tea thrips adults caught with a yellow sticky trap increased gradually from early May and peaked in late August, 2009. In 2010 and 2011, the most population was in early October. The yellow tea thrips of some species usually dominated from July in open citrus fields, and seven generations, at least, had occurred from May to late October 2009 by a yellow sticky trap survey. In 2009, S. dorsalis larva were observed from July and with peaks from late August to mid September and early October on citrus fruits. The damage symptoms appeared in the mid September. In 2011, the population peaks were in early July and late September, and the symptoms increased continually from mid July to late October. The symptoms were silver-scars or initial dark discolorations and then gradually changed to dark-brown discolorations or dark-brown scars. The percent of damaged fruits were 0.9%, 0.4%, 0.8% and 2.7% in 2008, 2009, 2010 and 2011, respectively, by survey in 64 typical orchards in Jeju Island. We are the first to report symptoms of the yellow tea thrip (Scirtothrips dotsalis) on citrus fruits.
4,000원
2.
2012.03
구독 인증기관 무료, 개인회원 유료
, , The size of infective Steinernema arenarium juveniles is variable and ranges from 724 to 1408 ㎛. Effects of harvest time and infective juvenile size on pathogenicity, development, and reproduction were examined in the last instar of the great wax moth, Galleria mellonella. Harvest time of infective juveniles (IJs) of S. arenarium affected pathogenicity. IJs harvested at the 10th day from trapping were more pathogenic than those harvested the 3rd day from trapping. Mortality of G. mellonella also depending on harvest time, i.e, 100% died within 48h when IJs were harvested at the 10th day, without relation to size. However, mortality was 40% in the small size group (SSG) compared with 18% in the large size group (LSG) within 48h when IJs were harvested at the 3rd day. Establishment of S. arenarium within the host was different depending on IJ size. The number of established IJs was 1.8 in the SSG, 3.3 in the LSG, and 3.2 in the mixed size group (MSG) when IJs were harvested at the 3rd day, and 5.3 in the SSG, 7.4 in the LSG, and 7.6 in the MSG when IJs were harvested at the 10th day. The length of the female adult was 7,070.5 ㎛ in the SSG and 7,893.9 ㎛ in the LSG and that of the male was 1,460.5 ㎛ in the SSG and 1,688.2 ㎛ in the LSG when IJs were harvested at the 3rd day. The length of the female adult was 7,573.6 ㎛ in the SSG and 8,305.4 ㎛ in the LSG and that of the male adult was 1,733.4 ㎛ in the SSG and 1,794.4 ㎛ in the LSG when IJs were harvested at the 10th day. Harvest time and size of IJs did not influence numbers of progeny or size of IJS.
4,000원
3.
2012.03
구독 인증기관 무료, 개인회원 유료
, , Detailed morphological descriptions and illustrations of the last instar larva of Lilioceris (Lilioceris) ruficollis (Baly, 1865) with the host species, Dioscorea spp., are presented for the first time. Taxonomical and ecological remarks on their biology are also given herein.
3,000원
4.
2012.03
구독 인증기관 무료, 개인회원 유료
, , Understanding the ecological complexity and habitat of a species are crucially important to conserve an endangered species. This study evaluated the patch network ecology of the endangered species Parnassius bremeri. The results indicated that 188 individuals were captured and 220 were recaptured, respectively. The sex ratio of female: male was 42:146, males were four times more abundant than females. The average longevity of an adult was 3.93 ± 3.93 days (male, 4.0 ± 3.9, female, 2.5 ± 1.0 days), the maximum longevity was 14 days for males and 13 days for females, respectively. Therefore, the expected longevity of males was longer than that of females. The average emigration distance for the species was 377 m, and the maximum emigration distance was 1550 m. The analysis of patch connectivity and individual colonization revealed that the ideal distance between patches was about 300 m. Moreover, a >, 600 m patch distance decreased the colonization rate severely. We also observed higher immigration and emigration between patches that were clustered in close proximity. This leads us to conclude that a higher number of patches at a close distance is best suited for P.bremeri. We find these results to be crucial to determine a policy to protect and conserve this endangered species.
4,000원
5.
2012.03
구독 인증기관 무료, 개인회원 유료
, , This study was conducted to investigate food preference and developmental characteristics of the gray field slug, Deroceras reticulatum Muller (Stylommatophora: Limacidae) using various foods. The food preference of D. reticulatum was most highest on Chinese cabbage (Brassica campestris L.), followed on cucumber (Cucumis sativus L.), and significantly low on beet (Beta vulgaris var. Ruba), kale(Brassica oleracea L. var. acephala D.C), carrot (Daucus carota L.) and Chinese cabbage (Brassica campestris L.) which were not different significantly. The total number of eggs laid by D. reticulatum was the highest (n = 109.6) on cucumber and the lowest (n = 10.1) on leaf perilla (Perilla frutescens var. japonica Hara). Hatchability was the highest (92.4%) on cucumber and the lowest (62.5%) on leaf perilla. The egg developmental period was not significantly different from 12 days to 13 days among host plants. Juvenile period and adult longevity ranged from 75 days to 111 days and 66 days to 187 days, respectively. Thereby, life span from egg to adult longevity of D. reticulatum was the longest on cucumber with 273 days and the shortest on 190 days on leaf perilla.
4,000원
6.
2012.03
구독 인증기관 무료, 개인회원 유료
, , The entomopathogenic bacterium, Xenorhabdus sp., was isolated from an entomopathogenic nematode, Steinernema monticolum. When these bacteria were injected into the hemocoel of the diamondback moth, Plutella xylostella, they caused significant mortality. However, the bacterium was not pathogenic when it was administered orally. This study showed that Xenorhabdus sp. significantly enhanced oral pathogenicity of Bacillus thuringiensis (Bt) against the last instar larvae of P. xylostella. Different ratios of culture broth of Xenorhabdus sp. and Bt showed significantly different pathogenicities against P. xylostella. In field tests, the optimal bacterial mixture significantly enhanced control efficacy against P.xylostella compared to Bt treatment alone. These results demonstrated that Xenorhabdus sp. culture broth can be developed as a potent biopesticide by enhancing the insecticidal efficacy of Bt.
4,000원
7.
2012.03
구독 인증기관 무료, 개인회원 유료
, , Effect of a new crop protectant ‘Bt-Plus’ on natural enemies was analyzed in this study. Tested natural enemies included two parasitic species of Aphidius colemani and Eretmocerus eremicus, and four predatory species of Harmonia axyridis, Orius laevigatus, Amblyseius swirskii, and Phytoseiulus persimilis. ‘Bt-Plus’ was formulated by combination of three entomopathogenic bacteria (Xenorhabdus nematophila (Xn), Photorhabdus temperata subsp. temperata (Ptt), Bacillus thuringiensis (Bt)) and bacterial metabolite (BM). All three types of ‘Bt-Plus’ showed significantly higher toxicities against fourth instar Plutella xylostella larvae than Bt single treatment. Two types of bacterial mixtures (‘Xn+Bt’ and ‘Ptt+Bt’) showed little toxicity to all natural enemies in both contact and oral feeding assays. However, ‘BM+Bt’ showed significant toxicities especially to two predatory mites of A. swirskii and P. persimilis. The acaricidal effects of different bacterial metabolites were evaluated against two spotted spider mite, Tetranychus urticae. All six BM chemicals showed significant acaricidal effects. The BM mixture used to prepare ‘Bt-Plus’ showed a high acaricidal activity with a median lethal concentration at 218.7 ppm (95% confidence interval: 163.2 - 262.3). These toxic effects of bacterial metabolites were also proved by cytotoxicity test against Sf9 cells. Especially, benzylideneacetone, which was used as a main ingredient of ‘BM+Bt’, showed high cytotoxicity at its low micromolar concentration.
4,300원
8.
2012.03
구독 인증기관 무료, 개인회원 유료
, , The black pine bast scale, Masucoccus thunbergianae (Hemiptera: Margarodidae), is a serious pest of the Japanese black pine, Pinus thunbergii, in Korea. The distribution of the black pine bast scale was examined, looking overall at 686 towns (eup), townships (myeon) or neighborhoods (dong). There were Japanese black pine (Pinus thunbergii) forests in 91 cities, counties (gun) and borough (gu), in seven provinces and three metropolitan cities during 2010. Black pine bast scale were found in 64.8% of cities or counties or borough (59) in 7 provinces and 3 metropolitan cities, and were distributed in all South Costal regions, Pohang in East Costal region and Boryeong in West Costal region. Chungcheongbukdo, Daejeon and Jeju did not have black pine bast scale. All the gu regions in Busan had black pine bast scale, of which the area with the highest prevalence was Haenam in Jeollanamdo (1.713 crawlers/0.785 cm 2 ). Songji-myeon had the highest occurrence rate (6.36 crawlers/0.785 cm 2 ) from the towns, township and dong. The density of black pine bast scale in twigs was highly correlated with percentage of the sample with scale (Correlation coefficacy=0.89).
4,000원
9.
2012.03
구독 인증기관 무료, 개인회원 유료
, , This study was conducted to evaluate the scouting methods for larva and adults of the alfalfa weevil, Hypera postica Gyllenhal on Chinese milkvetch, Astragalus sinicus L. in the field. Three sampling methods, shake-bucket, shake-picking, and a sweeping net were evaluated for collecting alfalfa weevil larvae. We found significant differences among scouting methods and date in all survey fields. Sweep-net sampling was less able to detect small larvae than large larvae, which were not detected until early April whereas the shake-bucket, and shake-picking methods efficiently collected larvae from middle March. A Pitfall trap with three different baits - no bait, kidney bean seeds and sprouting kidney beans were compared for collection efficiency of alfalfa weevil adults. Collection efficiencies were significantly different by bait(p<, 0.018). Traps baited with sprouting kidney beans were the most efficient for collecting the alfalfa weevil. The number of alfalfa weevil caught was not significantly different between kidney bean seed and no bait in the pitfall trap. Therefore, the shake-bucket method for larvae and a pitfall trap baited with sprouting kidney beans for adults are recommended for scouting of the alfalfa weevil in a Chinese milkvetch field.
4,000원
10.
2012.03
구독 인증기관 무료, 개인회원 유료
, , Two pupillarial species, Cryptoparlatorea leucaspis Lindinger and Fiorinia japonica Kuwana, are recorded for the first time in Korea. Both species were found on coniferous trees, Cryptomeria japonica and Torreya nucifera. Also an identification key, brief diagnoses, and photographs of Korean pupillarial species are provided to assist in their identification.
4,000원
