Knowledgebase

Cryptomeria japonica #925796

Asked March 10, 2026, 4:22 PM EDT

I have a Cryptomeria japonica tree and it’s doing well. What proactive disease and pest control do you recommend? And when should this be applied? Thanks Sheila

Queen Anne's County Maryland

Expert Response

We don't recommend any preventative pest or disease control in this situation, and Cryptomeria in particular is not a pest- or disease-prone plant. If the plant develops concerning symptoms, feel free to share photos with us for feedback. Often, discoloration or dieback is due to environmental stress, such as underwatering during drought, winterburn (a common condition that has affected lots of evergreens after this winter), or over-saturated roots (over-watering); or, the stress from one of those conditions predisposed the plant to a secondary pest or disease issue.

Miri
Answered by the Home and Garden Information Center (HGIC), University of Maryland Extension. For timely gardening information and tips, subscribe to our Maryland Grows blog and quarterly newsletter. Follow us on Facebook, Instagram, and YouTube. Replied March 10, 2026, 5:13 PM EDT

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