Rotation And Cover Crops

There are many examples of crop rotation sequences that passively suppress nematode populations which will not be reviewed here. Examples of active nematode suppression in crop rotation sequences are typically found with plant species that produce and excrete allelopathic compounds. These compounds then affect plant-parasitic nematodes in the rhizosphere either directly or indirectly by altering rhizosphere microbial populations (Halbrendt, 1996). For the purpose of this chapter, allelopathic

Table 1. Rotation/cover crops that actively suppress parasitic nematode populations in soil.

Common Name

Scientific Name

References

American joint vetch

Aeschynomene sp.

Rodriguez-Kabana et al., 1991a

Bahia grass

Paspalum spp.

Rodrfguez-Kabana et al., 1994b

Castor bean

Ricinus communis

Rodriguez-Kabana et al., 1991b

Marigold

Tagetes spp.

Tyler, 1938

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