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Cultural control of the root nematodes Pratylenchus indicus in rice through crop rotations.

Pratylenchus indicus nematodes cause damage to the roots of rice plants, which may lead to considerable yield reductions. In field trials with six different rice-based rotations it was tested whether the inclusion of other crops into the rotation can influence the population of Pratylenchus indicus. Investigation of soil samples and roots showed that rice, safflower, and tobacco increased the nematodes, whereas fallowing or growing Phaseolus radiatus L. decreased them.