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Replies
Hi Richard,
Is it a single Leylandii within the hedge that is suffering? Multiple may indicate pest, disease or environmental factors.
Trees and shrubs when damaged sufficiently can enter a 'spiral of decline' and die slowly over time. What percentage was removed?
Mark
It looks like the previous gardeners cut it hard and the dead part is spread over in area of 1m wide and 0.5m high and it is starting to move along the hedge and effecting the other Leylandii in the hedge. I would imagine it would be best to cut my losses and cut the diseased ones out and remove the root, but would it be ok to plant new leylandii in its place or might I just end up with the same problem?
Likely that it is aphids; it will recover as new growth is trimmed over the brown area
Hi Richard,
If you can rule out other causes: root compaction, weedkiller , etc, then its very likely to be a conifer aphid. Very common now and devastating to clipped conifers as the tight shape makes it easy for them to move steadily outward. They are a sap-sucking insect, will over-winter within the hedge and generally start low down then move outwards. Once its dead, conifer does not re-grow - you need to start a 'comb-over'..
We have some sprays to suit - organic based or chemical insecticides to help halt the spread - may need several resprays during the 'active' season to interrupt their lifecycle and reproduction.
Give me a ring and I can guide you on identification and some options
Richard @ Progreen
0800 032 6262, info@progreen.co.uk