County Durham,
United Kingdom 
hello. my green fast growing leyllandi trees are turning yellow near the lower branches and some have died. can you help? they are 2 years planted.
27 Jun, 2010
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Have a look for a sooty deposit on some of the stems in that area. If there is a sooty deposit, it will be a particular species of aphid that is causing the yellowing. It's becoming more and more common.
27 Jun, 2010