The worms are the larval stage of the adult moths, aka rosy maple moths. Green-Striped Maple Wormsĭryocampa rubicunda feeds on a few different types of tree, but maples are its favorite host.
If pruning dead wood doesn’t save an infested tree, it’s best to remove and destroy the entire specimen to prevent further spread.
Pyrethroid insecticide applications can work as a preventative measure, and permethrin formulations can be applied in February, a month before the beetles usually show up to bore into trees. Suffering from the combined damage of all these issues, infested plants often die. The beetles bore into trunks, feed on sapwood and heartwood, and vector fungal pathogens. Their presence is indicated by wilting leaves and toothpick-like woody trunk protrusions. Asian Ambrosia BeetlesĪlso known as the granulate ambrosia beetle, Xylosandrus crassiusculus shows up in early spring to attack deciduous trees with thin bark such as Japanese weeping maples. Read more about managing aphid infestations in our guide. Monterey sells horticultural oil in ready-to-spray and concentrate that are available at Arbico Organics. This plant owes the “Japanese” part of its common moniker to the way it was heavily cultivated by the Japanese people for centuries. dissectum hails from China, Japan, and Korea. Cultivation and Historyīest grown in USDA Hardiness Zones 5 to 8, A. I’ve generalized these details for a reason, though – with all of the natural variations and different cultivars out there, one all-encompassing description is difficult to provide if not impossible.īut a weeping habit and finely-dissected leaves are common features that all maples of this variety share. palmatum ranging in height from 15 to 25 feet.īoth the standard species and this variety possess a spread that is typically equal to or greater than their width.
dissectum has an average height of eight to 10 feet so it’s a bit shorter than a standard Japanese maple, with a typical A. The end result is lace-like foliage that sways a bit more gracefully in the wind than standard Japanese maple foliage.įor these reasons, this variety is also commonly referred to as threadleaf, cutleaf, or laceleaf Japanese maple.Ī. dissectum also has dissected leaves with seven to eleven lobes each.Įach lobe is jagged, feathery, and finely cut down to its point of attachment, or node.
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