Brown foliage on Thuja brabant conifer shrubs?
Can anyone give me an idea as to why some of the foliage on my young Thuja Occidentalis Brabant shrubs are turning a yellowy-brown colour please? The trees themselves appear to be thriving and are growing well. Thanks!
- arctostaphylosLv 41 decade agoFavorite Answer
Where is the damage? If it is the whole leaf, it could be a canker. If it's the tips it's probably a tip miner.Have you been fertilizing? Nutrient deficiencies as well as toxicities from too many salts can show up as discoloration. Here's a page that might help you ID the problem. http://www.ipm.ucdavis.edu/PMG/GARDEN/PLANTS/arbor...