• Korean journal of applied entomology
• /
• v.26 no.2 s.71
• /
• pp.83-88
• /
• 1987

Differences in susceptibility of several organophosphate, carbamate and pyrethroid insecticides to three species of aphids were determined by leaf-dipping and spray methods. The insects tested were the apterous adults of the green peach aphid (Myzus persicae), cotton aphid (Aphis gossypii) and soybean aphid (Aphis glycines). The comparison of $LC_{50}$ levels was indicated as follows; (1) The susceptibility to insecticides tested were greatly varied with the test methods. (2) The leaf dipping method is more recommendable than the spray method for insecticide screening with aphids. It was easier, more accurate and less variable than the latter. (3) The susceptibility to insecticides was greatly varied between the aphid species. Soybean aphid was more susceptible to the insecticides than green peach aphid and cotton aphid. Exceptionally, pirimicarb was not effective on the cotton aphid.

• Korean journal of applied entomology
• /
• v.33 no.2
• /
• pp.51-55
• /
• 1994

Mummification, host selection and biological characteristics of primary parasitoids and hyperparasitoids in the soybean aphid, Aphis glycines, were studied. The soybean aphid mummies which were infected by primary parasitoids or hyherparasitoids were collected at Taejon area from May to September in 1987 Primary parasitoids and hyperparasitoids were emerged 27.1% and 50.3%, from 177 collected mummies. respectively Aphidius cingulatus, Ephedrus persicae and Ephedres plagiator could be effective primary parasitoids against the soybean aphid. Among the hyperparasitoids, Asaphes unlgaris and Ardilea conuexa might be dominant species to primary parasitoids of the soybean aphid. Charips brasicae was recorded for the first time in Korea E.plagiator was less parasitized than any other primary parasitoid by hyperparasitoids. E. plagiator might be higher than A. cingulatus in the ability of prarsitism. Life span of hyperparasitoid and primary parasitoid was estimated to be 3~29 days and 1~4 days, respectively.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.25 no.3
• /
• pp.35-40
• /
• 1980

In order to evaluate the fluctuation of soybean aphid (Aphis glycines Matsumura) population, six leading soybean cultivars were planted on five different planting dates with three plant spacings. The survey of aphid population and climatical condition were made from June through September in 1978. According to the differences of planting dates and plant spacings the soybean aphid populations were varied, and varietal response to the aphid was significantly different. Counting of aphid infestation on top third trifoliolate leaf seemed to be efficient for the estimation of soybean aphid population.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.45 no.6
• /
• pp.353-355
• /
• 2000

The seasonal occurrence of aphids was investigated in the soybean Held to increase the control efficiency of aphid vectors of Soybean Mosaic Virus. The patterns of aphids occurrence were different according to planting time. There were two peaks in late June and mid-August in aphid population in optimum seeding (May 20), whereas the peak was around mid-June in early seeding(Apr, 20). Acyrthosiphon solani was dominant Species in early seeding, while Aphis glycines was dominant in optimum seeding. In early seeding, SMV incidence increased rapidly between 20 June and 30 June, suggesting that virus spread was strongly correlated with increased colonization of aphids. Imidacloprid WP, benfuracarb EC and acephate WP showed a good effect for the control of aphids without phytotoxicity. In the plot with infurrow treatment of imidachloprid G until 52 days after shooting, aphids were controled effectively. Acephate WP was applied as a foliar spray at V4, V6, or V4/V6 stage and all the treatments were effective on reducing: SMV incidence.

• Korean journal of applied entomology
• /
• v.20 no.2 s.47
• /
• pp.112-116
• /
• 1981

This study was conducted to investigate the seasonal occurrence of aphids and to evaluate their efficacy in the field for the control of some aphids on soybean when Carbofuran, Disulfoton and Ortran were applied infurrow at the planting time in 1976. Foxglove aphid (Aulacorthum solani) and soybean aphid (Aphis glycines) were dominat species in soybean field and there were two peaks in the year. The patterns of occurence of aphids were different between in field and yellow-pan. Carbofuran and Disulfoton showed a good effect for the control of aphids but Ortran was less effective.

• Korean journal of applied entomology
• /
• v.21 no.2 s.51
• /
• pp.53-60
• /
• 1982

Isolates of soybean mosaic virus (SMV) strains classified based on virulence in silt resistant soybean cultivars caused the same reactions in soybean cultivars used as differentials as those obtained by sap inoculations to the same cultivars. Five species of aphids (Myzus persicae SULZ., Aphis craccivora KOCH, Aphis citricola VAN., Rhopalosiphum maidis FIT., End R. padi L.) were able to transmit each of SMV strains. However, R. maidis and R. padi were inefficient vectors for transmission of SMV strain G3. Spread if four SMV strains (G2, G3, G6, and G7) was monitored in the field from sapinoculated plants in a one meter row of Williams soybeans (source plants) to plants in an adjacent row of Williams 80cm away (test plants). Test plants wert downwind from the source plants. A complete block design was used. Spread of strain G6 was significantly greater than that of other three strains. Two hundred six aphids were collected from June 27, 1979 to August 2, 1979 in the same field. A. citricola was the mist prevalent, comprising $68\%$ of the total aphids. Yields of Williams inoculated with each strain were also compared. Yields were the least from plants inoculated with strain G2 following G6, G3, and G7 in that order.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.22 no.1
• /
• pp.231-236
• /
• 2021

The Aphid, Myzus persicae, and the bean bug, Riptortus clavatus, are major insects in crops. This study examined the insecticide susceptibility and phytotoxicity of insecticides dispersed using an Unmanned Aerial Vehicle (UAV, multi-copter) against the insects. Sulfoxaflor suspension concentrate (SC, 16X) on potato fields and etofenprox, methoxyfenzide suspo-emulsion(SE, 8X) on soybean fields were dispersed after deploying water-sensitive paper within the field to measure the distribution pattern and coverage index of the falling insecticide. Both insecticides showed a controlled mortality of 76.4% against aphids and 97.5% and 94.4% against the 2nd nymphal, and 5th nymphal stage of the bugs, respectively. The droplet distribution was less than 0.5mm, and coverage analysis revealed an inside and outside coverage of 3.1 and 1.6, respectively. The surrounding area was affected by insecticide spraying using a multi-copter. This study is expected to help expand UAV control and use it safely in the future.

• Korean journal of applied entomology
• /
• v.20 no.3 s.48
• /
• pp.177-180
• /
• 1981

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.63 no.3
• /
• pp.257-264
• /
• 2018

The recent global climate change induced the drought, flooding, and insect pest outbreaks. These caused the severe damage to crop yield in the domesticated field and occurrence change of insect pest species. The sap-sucking insect pest, aphids are common in soybean [Glycine max (L.) Merr.] and cause serious yield losses. Thus, developing resistance cultivars is promising and efficient strategy to prevent the significant yield losses by aphid and screening germplasm is the essential procedure to achieve this goal. We tried to establish a resistance test indicator for foxglove aphid, Aulacorthum solani (Kaltenbach), in soybean and found that plant damage degree or infested plant damage is most suitable one. Also we screened around 1,200 of soybean germplasm including wild and cultivated species for its resistance to foxglove aphid from the various origins, and 67 soybeans, including PI 366121, showed antixenosis resistance, 31 germplasms among 67 antixenosis germplasms were showed antibiosis to foxglove aphid with non-choice test. The identified foxglove aphid resistant soybean resources showed significantly low rate in survival test. Furthermore, resistance type, (i.e., antibiosis or antixenosis) of each candidate were varied. In this research, we established the screening index for foxglove aphid resistance in soybean, and identified the resistance varieties. This result could be useful resources in breeding for new foxglove aphid resistance soybean cultivars, and provide fundamental information to investigate the resistance mechanism in soybean.

• Korean journal of applied entomology
• /
• v.60 no.3
• /
• pp.277-286
• /
• 2021

The natural enemy was identified as a parasitic wasp, Binodoxys communis Gahan. B. communis taxonomically belongs to the family braconidae, subfamily aphidinae, and genera binodoxys. It develops normally at 17.5 to 32.5℃, and not at 35℃. Depending on the temperature, the longest development period of B. communis was 21.9 days at 17.5℃, and shortest was 6.46 days at 32.5℃. The effective accumulated temperature was 175.44 DD for females as well as males; however, the developmental threshold temperature was 10.87℃ and 10.74℃ for females and males, respectively. This parasitic wasp was found to prefer cotton aphids and soybean aphids as its prey.