Consequently, they suggested that nematodes that do not penetrate the root or ingest the activated -terthienyl will not be killed, and therefore marigold is more effective as a cover crop than as a soil amendment (Bakker et al., 1979; Gommers, 1972). This is supported by later findings showing that -terthienyl compounds are completely devoid of nematicidal activity when mixed into soil (Kagan et al., 1987; Marles et al., 1992).
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