Journal of Nematology (2004) 36, 313-314

N.L. David, R.E. Ingham, N.D. McKinley, B.A. Charlton, K.J. Merrifield and N.M. Wade (2004)
Early season oxamyl applications increase control of Columbia root-knot nematode (Meloidogyne chitwoodi) in potato
Journal of Nematology 36 (3), 313-314
paper presented at the Society of Nematologists 43rd Annual Meeting, Estes Park, Colorado 7-11 August 2004
Abstract: Columbia root-knot nematode (Meloidogyne chitwoodi) (CRKN) is a serious pathogen of potato (Solarium tuberosum) in many areas of the western United States. Tuber infection by CRKN reduces tuber quality by inducing surface galling and/or brown spots that develop around internal infection sites. Oxamyl reduces CRKN infection on potato, but a short half-life requires multiple applications at strategic times during the life cycle of the nematode for optimum control. Historically, initial oxamyl applications of 1lb/acre have been made at 950 soil degree-days base 5 C (DD5C) after planting, coinciding with the hatch of 2nd generation juveniles, followed by applications every two weeks until potato harvest. Recent work in three climatic regions of the western United States indicates early season oxamyl applications (prior to 950 DD5C) increase CRKN control. Adding early season oxamyl applications to the standard program reduced tuber infection by 29 and 40% at Hermiston, OR in 2001, and 2002, respectively. Similarly, early season oxamyl applications reduced tuber infection by 70 and 64% in the San Luis Valley of Colorado in 2002 and 2003, respectively, and by 96% in Klamath Falls during 2002. Of the early season applications tested, in-furrow at planting was most efficacious. Population dynamics data indicate in-furrow oxamyl applications reduce the number of juveniles present in the soil during the period of initial tuber infection.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Russell E. Ingham

Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Meloidogyne chitwoodi	Potato (Solanum tuberosum)	U.S.A. (SW)
	Meloidogyne chitwoodi	Potato (Solanum tuberosum)	U.S.A. (NW)