CROPPPING HISTORY EFFECTS

Differences in cropping history of a field that is now uniformly planted to a crop susceptible to root knot nematodes (Meloiodogyne sp.) can be responsible for the irregularity of root knot damage within that field. Let us assume that a portion of that field was previously an established vineyard on which root knot nematodes increased to high levels, while the remainder of the field was in grassy pasture free of root knot nematode. The pattern of plant damage due to root knot nematode infection will correspond to the previous vineyard area where nematode population density is much higher.

From: McKenry, M.V. and P. A. Roberts. 1985. Phytonematology Study Guide. University of California, Division of Agriculture and Natural Resources.

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