Economic Threshold of Meloidogyne incognita for Greenhouse Grown Cucumber in Korea

Kim, Dong Geun; Lee, Joong Hwan

Research in Plant Disease 2008;14(2):117-121.
Published online August 30, 2008.

오이 시설재배시 고구마뿌리혹선충의 경제적피해한계

김동근, 이중환

Economic Threshold of Meloidogyne incognita for Greenhouse Grown Cucumber in Korea

Dong Geun Kim, Joong Hwan Lee

Abstract

To determine the economic threshold level of Meloidogyne incognita on cucumber in greenhouse conditions, cucumber seedlings (Cucumis sativa L. cv. ``Super Manchon``) grafted on ``Jangsushintozoa`` (Cucurbita maxima x Cu. moschata) were planted in wooden boxes (30×40×15 cm, L×W×D) under a plastic house in August 01 and harvested from Sep. 01-Oct. 30, 2006. The initial nematode population densities (Pi) in the wooden boxes were adjusted to 0, 10, 30, 100, 300, and 600 second-stage juveniles (J2)/100 cm3 soil. The relationship of total fruit yield to Pi level could be adequately described by a linear regression equation, Y=0.82-0.04·Log10 (Pi+1). Initial nematode densities (Pi) before planting in excess of 5 J2/1,000 cm3 soil caused in total yields loss that is equivalent to the costs of granular nematicide application; Pi level in excess of 25 J2/1,000 cm3 soil caused in total yields loss that exceed the costs for application of fumigants at current control costs. We propose two different management strategies depending on nematode densities, (i) application of non-fumigant granular nematicides for M. incognita Pi level of 5 J2/1,000 cm3 soil and (ii) fumigant treatment with Pi level over 25 J2/1,000 cm3 soil. Soil samples to determine population density of Meloidogyne spp. for advisory purposes should be taken several months before planting time, which allows a period of time enough for implementing management procedures.

Key Words: Cucumber, Cucumis sativa, Economic threshold, Meloidogyne incognita, Population density