Abstract

The susceptibility of some rubber clones to leaf disease caused by Colletotrichum gloeosporioides could not be related to the surface morphology of their leaves. Although minor differences were observed in the time of deposition of wax and in its pattern and density, these did not affect spore germination or appressorial formation. Similar levels of germination occurred on both resistant and susceptible clones, but on slightly older and hence more waxy leaflets, spores tended to form longer germ-tubes. No directional response of germ-tube growth to any topographical features of the leaf surface was observed.

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