It is recognized that peak LDD outbreaks represent a significant nuisance factor to affected residents, and the potential for any tree mortality on private property is impactful and concerning to landowners. Maintaining healthy trees and forests is an important defense against the LDD Moth.
Scraping egg masses
During their egg stage, from September to April, egg masses can be scraped off surfaces (e.g. bark, decks, lawn furniture) into a catchment container with soapy water for at least 48 hours. If there is a large amount of egg masses where scraping is not possible, horticultural oil (follow instructions accordingly) can be applied to affected areas in the later winter in order to smother eggs before they hatch in the spring.
Burlap wrapping
From late June to August, large caterpillars may move down tree trunks during hot days. To target these, you can wrap a large piece of burlap around the trunk fastened by twine or rope around the middle. This method may also be used to trap females in their moth stage (from July to August).
Wrapping your tree in burlap (how-to video): Fold the top half of the burlap over the twine so there is overhang that the caterpillars can crawl under. Check the trap every afternoon and place caterpillars and pupae in a bucket of soapy water for at least 48 hours.
Hand-picking
From May to July, handpicking is an effective way to remove caterpillars from smaller trees and shrubs. When handling LDD Moth caterpillars and pupae, use gloves; the long hairs can cause skin irritation or allergic reactions in some people.
Increase watering
During years trees are stressed from defoliation, it is advisable to water the tree every 3-5 days during periods of drought or high heat, if possible.
Attract natural predators
To attract natural predators of LDD Moth you can plant native shrubs and flowers (PDF).
Prevent further spread
As well, it is important to try to reduce the spread of this invasive species and others by checking any equipment and/or vehicles for hitchhikers before travelling, and do not move firewood.