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.

Note
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