Abstract
SOME inorganic salts stimulate eggs of the beet cyst nematode, Heterodera schachtii Schm., to hatch, but less effectively than diffusate from sugar-beet roots1–3. The effective ions are potential oxidizing agents. We have extended hatching tests to some metallic ions not previously tried, including Ba2+, Al3+, Pb2+, MoO4−, Mn2+, Co2+, Zn2+ and Cd2+, and have re-tested some salts (MgCl2, KCl, NaCl, HgCl2 and FeCl3). Copper, previously tested as the sulphate, was tested as the chloride, and chlorides of the other metals were included in tests whereever possible. All salts were first tested at a concentration of ∼3 mM in water and those with some activity were tested again over a range of concentrations. The hatch of eggs (Table 1) is expressed as a hatch rating3: where Hs is the hatch in the substance, Hd is the hatch in beet root diffusate and Hw is the hatch in distilled water, and also as a percentage of the total number of eggs in the cysts.
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References
Rademacher, R., and Schmidt, O., Arch. PflBau, 10, 237 (1933).
Wallace, H. R., Ann. App. Biol., 44, 274 (1956).
Clarke, A. J., and Shepherd, A. M., Nematologica, 10, 431 (1964).
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CLARKE, A., SHEPHERD, A. Zinc and Other Metallic Ions as Hatching Agents for the Beet Cyst Nematode, Heterocdera schachtii Schm.. Nature 208, 502 (1965). https://doi.org/10.1038/208502a0
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DOI: https://doi.org/10.1038/208502a0
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