How to deal with case moth infestation?

Smw

I’ve a few ficifolia trees in my small garden. Last season one was decimated by case moths. I trimmed the tree back severely in desperation as insecticides had no effect. 

this season another one has been attacked. I’ve tried a few pesticides but I think because the moths are encased, it has no effect on them 

I’m aware that they are part of the natural world but because they’re encased have become almost plague like in my garden, they’ve become a real issue. 
I have been picking them off and crushing them but I can get to the centre of the tree to deal with the ones lurking there.

do you have any suggestions?

EricL

Hello @Smw 

Welcome to the Bunnings Workshop community. It's sensational to have you join us, and thanks for sharing your question about your case moth infestation.

Case moths can be challenging to control because their protective casings make them resistant to most pesticides. One of the most effective methods is physical removal, so continue picking them off by hand. For those hiding in the center of the tree, you can use a long stick or pole to knock them loose or prune dense sections to improve access. Encouraging natural predators, such as butcherbirds or kookaburras, can also help. Adding bird-friendly features like birdbaths or native plants to your garden may attract these birds, which love to feast on case moth larvae.

Horticultural or neem oils can be effective when sprayed on the tree. These oils may smother the larvae when they emerge slightly from their cases to feed, so be sure to coat the leaves, branches, and any visible cases thoroughly. Additionally, while severe pruning last season may have stressed the tree and made it more vulnerable, lighter pruning this time can help open up the canopy. This not only reduces the appeal for pests but also makes it easier for you to manage infestations.

If the problem persists, I suggest consulting a local arborist or horticulturist they could provide further insight, especially if there are other factors in your garden making the trees more attractive to case moths. With persistence and a mix of these strategies, you can regain control and protect your ficifolia trees.

Please make sure to wear personal protection such as appropriate clothing, gloves, goggles and a mask when using chemical sprays.

If you need further assistance, please let us know.

Eric