Gibb, K. S., and J. M. Fisher. 1986. Co-ordination of the life-cycle of Contortylenchus grandicolli (Nematoda: Allantonematidae) with that of its host Ips grandicollis (Scolytidae). Nematologica 32: 222-233. Gibbs, John N., H. M. Heybroek, and Francis W Holmes. 1972. Aggressive strain of Ceratocystis ulmi in Britain. Nature [London] 236(5342): 121-122.
Gibb & Fisher 1986
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