• Title/Summary/Keyword: 밀베멕틴

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Seasonal Occurrence of Tetranychus kanzawai and Control Efficacy of Alternate Use of Natural Enemy and Miticide in Rubus coreanus Field (복분자딸기에서 차응애의 발생소장과 천적과 살비제 교호사용의 방제효과)

  • Lim, Ju-Rak;You, Jin;Cheong, Seong-Soo;Choi, Dong-Chil;Hwang, Chang-Yeon
    • Korean journal of applied entomology
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    • v.49 no.3
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    • pp.233-239
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    • 2010
  • Seasonal occurrence and suitable time of control of Tetranychus kanzawai along with the control efficacy of the alternative use of natural predator and miticide was investigated in Rubus coreanus (Miquel). T. kanzawai appeared in late May with its peak between June and July, and decreased after August in R. coreanus. In Iksan, T. kanzawai estimates show peaks 2~4 times per year during the investigation periods from 2006 to 2008 in R. coreanus fields. Suitable time of control of T. kanzawai was in early to mid May. And control effects of T. kanzawai was improved with an alternated control plot, treating miticides in early-occurrence of T. kanzawai and then releasing the natural predator (Phytoseiulus persimilis Anthias-Henriot). Also, the yields of R. coreanus was highest in the alternated control plot of 638kg/10a compared to non-treatment of 559kg/10a.

Control Effect of Botanical Pyrethrum to Polyphagotarsonemus latus (Banks) (Acari: Tarsonemidae) in Green Perilla (잎들깨에서 차먼지응애에 대한 천연 피레스럼 방제효과)

  • Seo, Youn-Kyung;Chae, Eui-Soo;Ann, Seoung-Won;Choi, Yong-Seok
    • Korean journal of applied entomology
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    • v.59 no.4
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    • pp.421-425
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    • 2020
  • We investigated an ecologically-sensitive method to control Polyphagotarsonemus latus in a green perilla polyvinyl house using concentrated pyrethrum. The survival rates of Polyphagotarsonemus latus nymphs and adults to 2%, 4%, and 6% pyrethrum 3 days after spraying were 58.1%, 27.5%, and 22.7% respectively, and 73.4%, 37.3%, and 30.6% at 5 days after spraying. These results show that the most effective control occurred using 6% pyrethrum. To investigating the densities of P. latus on a 1 cm diameter leaf-disk of green perilla, we sprayed the leaf every 10 days from May 10 with 6% pyrethrum 1,000 times and milbemectin EC 2% 1,000 times. The period chosen was one where the incidence of P. latus could be predicted. The density was kept low during the treatment period. However, if leaf damage had already occurred from P. latus, the density could not be decreased by spraying 1 or 2 times each week where milbemectin EC 2% was used, but the population could be reduced when sprayed 3 times. Therefore, in order to effectively control P. latus in green perilla greenhouses, it is important to begin treatment at an early stage when P. latus are first observed.