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The in vitro nematicidal activity of α-terthienyl was markedly enhanced when at the same time radiation with daylight or specific parts of the daylight spectrum was applied. Near ultra-violet light appeared to be the active part of the daylight spectrum. The same effects were found with two synthetically prepared nematicidal dithienylethenes and 2,3-dihydro-2-hydroxy-3-methylene-6-methylbenzofuran, a natural nematicide from roots of a Helenium hybrid. A common feature of these compounds is their absorption in the near ultra-violet region. Nematodes released α-terthienyl but more slowly than it was taken up.
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F.J. Gommers (1972) studied this question.
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