Zusammenfassung
MancheEntomophthora-Arten sind im Infektionsversuch nicht so wirtsspezifisch, wie oft angenommen wird. So waren die TermitenCoptotermes formosanus undReticulitermes lucifugus gegenüberEntomophthora destruens, E. thaxteriana und 2 Stämmen vonE. virulenta anfällig; die unterschiedliche Mortalität erreichte 65–100%. Das Infektionsoptimum fürE. destruens lag bei 15–22°C. 3–5 Tage alte Dotterplattenkulturen brachten stärkste Konidien-bildung und Infektionsität. Die Virulenz vonE. thaxteriana konnte durch geeignete Wirtspassage gesteigert werden.
Summary
The experiments have again confirmed that someEntomophthora species are under experimental conditions not so specific with regard to their host, as has often been taken for granted. Their specifity under natural conditions is also given by ecological factors.
The termites ofC. formosanus were infested byE. thaxteriana (100 per cent),E. destruens (95 per cent), andE. virulenta, strain No 1 (70 per cent), while the termites ofR. lucifugus byE. destruens (80 per cent), andE. virulenta, strain No 1 (70 per cent) and strain No 2 (65 per cent). The two termite species have shown a different response to the three fungi.
The optimum temperature for the development of mycosis caused byE. destruens ranges in the two termite species between 15° and 22°C; in artificial nests of termites, however, both termite species have been cultivated successfully at 26°–28°C.
The most vigorous formation of conidia on coagulated yolk apparently takes place between the 3rd and the 5th day of cultivation. Such cultures may give a high percentage infection of termites.
The strains ofE. thaxteriana which were freshly isolated from a closely related or identical host, have proved to be much more virulent with regard to this host as compared with strains from a long-term cultivation in vitro or such which were reisolated from a less closely related host.
The studied material of conidia showed that not only individual species but also individual strains of the same species which had been cultivated for a long period of time in the same way on the same medium differed by their pathogenicity.
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Krejzová, R. Infektionsversuche mit einigenEntomophthora-arten bei den termitenCoptotermes formosanus (Shiraki) undReticulitermes lucifugus (Rossi). Entomophaga 16, 221–231 (1971). https://doi.org/10.1007/BF02371172
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DOI: https://doi.org/10.1007/BF02371172