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Title: THE EFFECT OF GREEN MANURES ON MELOIDOGYNE CHITWOODI AND PARATRICHODORUS ALLIUS, ECONOMICALLY IMPORTANT NEMATODES OF POTATOES IN THE PACIFIC NORTHWEST OF U.S.A.

Author
item RIGA, EKATERINI - WSU-IAREC, PROSSER,WA
item Collins, Harold

Submitted to: Agroindustria Rivista Quadrimestrale
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 11/24/2004
Publication Date: 5/1/2005
Citation: Riga, E., Collins, H.P. 2005. The effect of green manures on meloidogyne chitwoodi and paratrichodorus allius, economically important nematodes of potatoes in the pacific northwest of u.s.a.. Agroindustria Rivista Quadrimestrale. 3:321-322.

Interpretive Summary: Meloidogyne chitwoodi, the Columbia root-knot nematode (CRN) and the stubby root nematode, Paratrichodorus allius, which vectors the tobacco rattle virus (TRV) are serious pest of potatoes in the Pacific Northwest (PNW). Both pests blemish potato tubers and render them unmarketable. Presently, both CRN and TRV vector are controlled by costly soil fumigation. As an alternative to fumigation, mustard and/or arugula as green manure are used to manage these nematodes. Recently, arugula, Eruca sativa, a Brassica plant, has been shown to have a great potential for controlling pathogenic fungi and plant parasitic nematodes. Arugula has two roles, as a trap crop, it decreases parasitic nematodes and as a green manure suppresses pathogenic fungi and plant parasitic nematodes. In a greenhouse study we investigated the effect of green manures of arugula, mustards and mustard plus arugula blends on M. chitwoodi and P. allius survival.

Technical Abstract: The Columbia root knot nematode (CRN), Meloidogyne chitwoodi (Golden et al.) and the tobacco rattle virus (TRV) vector, stubby root nematode, Paratrichodorus allius (Jensen) are serious pests of potatoes in the Pacific Northwest (PNW), as they blemish potato tubers and render them unmarketable. Presently, both CRN and the TRV vector are controlled by synthetic soil fumigants like 1,3-dichloropropene and/or metham sodium which are costly in addition to cause environmental concerns. The use of green manures alone or in combination with low input nematicide has shown potential for controlling several soil-borne fungal pathogens and root-knot nematodes and may be a viable alternative to herbicides and soil fumigants. Recently, arugula, Eruca sativa, a Brassica plant, has been shown to have a great potential for controlling pathogenic fungi and plant parasitic nematodes. In a greenhouse study, Brassica juncea (ISCI20), Eruca sativa (NEMAT), and combination of both significantly reduced CRN population. Similarly B. juncea (ISCI20, ISCI99, ISCI61, and Absolut), Eruca sativa (NEMAT), and combination of NEMAT and ISCI61, and NEMAT and ISCI20, significantly reduced P. allius populations in the greenhouse soil.