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Lawson Cyprus disease


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Could it be a sooty mold associated with Cypress aphid? There likely wouldn't be any aphids on the dead parts now, but you might see some at the margins of the killed/living tissues. Or the aphids from early summer may have entirely moved along, leaving the foliage and branchlets with impaired translocation capacity. Then, late summer heat and dry conditions can make evident the earlier infestation, even without the aphids. In that scenario, the sooty mold is more an indicator of the insect than a primary pathogen.

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