I have two large (1 metre across) Elkhorns and I have noticed lately that where the fronds come out of the brown rosette there is a sawdust type discharge which has a sort of a web through it. Does anyone know what this could be and how I should treat it if in fact it needs treating.
I have now discovered that around each sawdust discharge there are bundles of small parts of chewed fronds, ranging from 1 to 6 centimetres. They have been chewed off and taken to the base of the frond where presumably they will form part of a nest or cocoon or something
Hello Ron. I discovered the same thing on my staghorns growing on trees! I never found the culprit, but I suspected a grub of some sort. I made a mix of pyrethrum and sprayed it on the foliage and behind where the plant attaches itself. Within a few days whatever was in there was not active any more and there is now new fronds emerging, unchewed! This should help you. Make the mix a tad stronger than the label says. All the best.
You were smarter than I John. I took mine down and submerged them in a pyrethrum mixture in a wheelie bin. It took, my wife and half the neighbourhood to get the wet ferns back up the trees! But I had the same successful result. Thank you for you reply, Regards, Ron