Arbor vitae are subject to attacks by the arbor vitae leaf miner. Look for small exit holes accompanied by white cocoons in leaf angles.
Landscape Arborvitae Leafminer Umass Center For Agriculture Food And The Environment
To use copper for tip blight blend 3 1 3 tablespoons of copper sulfate with 10 tablespoons hydrated lime in 1 gallon of water.
When to spray for arborvitae leafminer. External sprays won t have an effect on the larvae once they burrow so you need to spray weekly during this period to catch the larvae as they hatch. A classic reference on ornamental pest control diseases and pests of ornamental plants 5th edition by pascal pirone 1978 lists two control strategies for the leaf miner. Lightly sheer branches in late april or early may and before leafminer adults emerge then rake and remove trimmings.
Spray your arborvitae with this copper solution in early spring and in the fall concentrating on the tree s outer branches. A sample of alm received at the sppc on may 1 2015 from knox county contained moths that were already emerging. Systemic insecticides are able to kill the larvae once they are in the host.
Apply a copper spray to additionally protect the tree from tip blight. According to the wsu extension the adult moths are silver tan and approximately 1 4 in length. Pruning and destroying infested leaves needles or spray with diazinon a discontinued formerly epa registered pesticide.
At least 26 species of parasitic wasps have been reared from infected arborvitae leafminers. When you see small black flies in the bag which will be the leaf miner larva becoming adults spray the plants daily for a week. They look like tiny white or silver moths and are easily seen on the plant if you shake the branches.
Late may early june adult leafminers hatch. Arborvitae leafminer moth treatment asked may 10 2017 3 05 pm edt the cooperative suggested using acephate 97 to treat the leafminer moth my question is if i use a tank sprayer how much product per gallon of water. If more rapid suppression is desired shake the foliage in june or july to see if the moths fly around the shrubs.
To effectively rid plants of leaf miners with pesticide in the early spring place a few infected leaves in a ziplock bag and check the bag daily. Doing nothing should allow these parasites to reduce the population of leafminers naturally. Only spray during the occasional outbreak but make sure there is a vulnerable life stage present.
Adult arborvitae leafminers argyresthia thuiella appear starting around mid june into july or 533 700 growing degree days. The use of yellow sticky cards for monitoring adult flight is not effective for this leafmining pest and visual observations are necessary. They stick around to lay eggs on the leaves.
Thus we can surmise from that year s data that egg laying should be occurring by early may and protective insecticide spray applications should be made at that time. Chemical cover sprays can be applied at this time. June fall larvae will burrow into the scales of the leaf and mine the nutrients there.
Arborvitae Leafminer Faddegon S Nursery Inc
Arborvitae Leafminer Nc State Extension Publications
Arborvitae Leafminer Faddegon S Nursery Inc
Landscape Arborvitae Leafminer Umass Center For Agriculture Food And The Environment
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Arborvitae Leafminer Nc State Extension Publications