Nematodes of Norfolk Island.

Abstract

plants. During transmission experiments it was possible to transmit A. ritzemabosi from tomato (After Baermann funnel extraction) to leaves of Chrysanthemum indicum L., L., Dahlia sp. cult. and Solanum nigrum L. where characteristic leaf lesions were produced. The unusual new recording on two out of six, young, 1-2 m high, Tristania trees which had been planted in a pasture, likewise prompted a search of the surrounding vegetation. Foliar lesions were found only on Lotos cornicuteius but not on several other weeds in the immediate vicinity of the infested Brisbane box trees and numerous nematodes were extracted. In this case it appears again possible that weeds were the source of infestation, because no symptoms had been observed before planting out, nor were plants from the same source, but planted out elsewhere, affected. Acknowledgements are due to staff members of the Centraalbureau voor Schimmelcultures, Baarn, The Netherlands, for identification of Botrytis nerctsstcote, Fusarium seccnert and Tubakia dryina; to my colleague H.M. Dance for identification of Phytophthora drechsleri and P. meadii; to G.H. Robertson for identification of Pythium otiqenarum and P. rostratum; to W. Thomas for confirming my identification of woody gall virus; and to J. Cole for confirming the indentity of Peniophora sacrata.