Soil Testing and Plant Diagnostic Services

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Sampling for plant-parasitic nematodes

Soybean cyst nematode

  • Dig roots and examine for presence of cysts from soybean flowering throughout growing season.
  • Sample soil from harvest until time of seed purchase. Nematode levels are highest following a soybean crop and at the end of the season. High levels will increase the chance of detecting the nematodes.

Corn nematodes

Needle and sting

  • Root-associated nematodes found in early spring where they cause plant stunting

Other plant-parasitic nematodes

  • Highest levels are found at the end of the growing season. The levels of these nematodes decrease when growing plants are absent, making detection difficult and unreliable as a predictor of problems in the next growing season.

Cotton nematodes

  • See other plant-parasitic nematodes under corn nematodes.

Root-knot nematodes

  • Look for the presence of galls on the roots at the end of the season.
  • Sample soil at the end of the growing season but before the plants senesce.

Golf green nematodes

  • Nematode levels are highest when the plants are under stress. In Missouri this often occurs around July 4th.

The lab checks only for presence or absence of the following plant-parasitic nematodes.

Pinewood nematodes

  • Sample branches greater than one inch in diameter or the tree trunk of symptomatic trees.

Foliar nematodes

  • Submit symptomatic foliage.

Root-knot nematodes

  • Send bare rootstock

Updated 1/6/14