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http://dx.doi.org/10.5656/KSAE.2011.06.0.28

Economic Injury Levels and control threshold of Tetranychus kanzawai Kishida(Acari, Tetranychidae) Infesting Korean black raspberry (Rubus coreanus Miquel)  

Lim, Ju-Rak (Jeollabuk-do Agricultural Research and Extension Services)
You, Jin (Jeollabuk-do Agricultural Research and Extension Services)
Lee, Ki-Kwon (Jeollabuk-do Agricultural Research and Extension Services)
Hwang, Chang-Yeon (Faculty Biological Resources Science, Chonbuk National University)
Publication Information
Korean journal of applied entomology / v.50, no.2, 2011 , pp. 151-156 More about this Journal
Abstract
Economic injury levels (EILs) and economic control threshold (ET) were estimated for the Tea red spider mite, Tetranychus kanzawai Kishida(Acari, Tetranychidae) in Rubus coreanus Miquel. T. kanzawai density increased until the early-July and thereafter decreased in all plots except the non-innoculation plot where initial density of the mite were different each 0, 5, 10, 20 and 40 adults per plant branch on May 7 in 2008. And the occurrence of the densities were increased higher innoculated density than different innoculation density. The yield was decreased with increasing initial mite density and thereby the rates of yield loss was increased with increasing initial mite density. And T. kanzawai occurrence density, yields and the rates of yield loss, where initial density of the mite were different each 0, 2, 5, 10 and 20 adults per plant branch on May 8 in 2009 were similar tendency to 2008 year results. The relationship between initial T. kanzawai densities and the yield losses was well described by a linear regression, Y = 0.6545X + 3.0425 ($R^2$ = 0.93) in 2008, Y = 0.9031X + 2.0899($R^2$ = 0.96) in 2009. Based on the relationship, the number of adults per plant branch(EILs) which can cause 5% loss of yield was estimated to be approximately 3.0 in 2008 and 3.2 in 2009. And the ET was estimated to be approximately 2.4 in 2008 and 2.6 in 2009. The relationship between initial T. kanzawai densities and occurrence density of mid-May considering the best spray timing against T. kanzawai was well described by a linear regression, Y = 0.471X + 2.495($R^2$ = 0.95) in 2008, Y = 0.9938X + 3.1858($R^2$ = 0.96) in 2009. Based on the relationship, the number of adults per leaf(ET) in mid-May which can cause 5% loss of yield was estimated to be approximately 3.6 in 2008 and 5.8 in 2009.
Keywords
Economic injury level; Economic threshold; Tetranychus kanzawai; Rubus coreanus;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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