bonsai hole – Bonsai Questions and Answers

I’ve had a bonsai for a couple of years. a year ago I noticed that the bark started to pierce and today the hole is very big. I don’t understand why, but I think that the bonsai is also fine because it has green leaves.

Rodilegno

Answer: hole in the bonsai

Dear Antonio,

The presence of holes in the bark is usually not good news; a healthy plant, without any problem, is not subject to the formation of holes of any kind, in the bark or in the wood. Usually the holes are clear symptoms of the presence of a wood of various types, that is, an insect larva that has been deposited under the bark, from where it began to enter the plant, devouring the wood.

This type of insect is often present on a plant as a single specimen, and therefore its presence in the trunk can be indicated simply by the entry hole, without your bonsai showing other symptoms; clear that, an insect that devours the wood and the presence of its excrements in the hole, and also the hole lying, with the wood left uncovered, without protection against fungal attacks div rio type, are not a pleasant element for your bonsai.

If it is a wood rod, or another insect that pierces bark and wood, you should also see exudate coming out of the hole, and chips, or the remains of the meal of your little guest.

To be sure that there is nothing in the hole, it is advisable to arm yourself with a sharp cutter, and cut a little into the hole, widening it, to see if in correspondence of it there is the gallery produced by the insect; in such a case, then special insecticides are used, which must be injected into the hole, and will kill any insect present; then, after having thoroughly cleaned the walls of the hole and injected the insecticide, wait a few hours and then cover the areas of live wood most exposed with mastic for pruning, of the type with fungicide.

In this way it should be possible to avoid, on the one hand, that any wood continues to eat the plant and, on the other hand, that any fungal or bacterial diseases attack the wood of the bonsai. The wood around the hole then, once dry, could be bleached, so as to make interesting this characteristic of your bonsai, or you could mask it, with mastic or other materials, to prevent it from being noticed (it depends a bit ‘on your taste, the size of the hole and its location on the tree).

After the larval stage, the insects that feed on the wood of the trees, pupate and become adults, or moths, and flicker away, ready for courtship and to lay more eggs on the bark of the trees, so even if the insect in your bonsai should have already left, it is advisable to protect the wood discovered in some way, to prevent further larvae from coming.

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