This disease is caused by the fungus Seiridium cardinale, and can cause branch die-back of leyland cypress and western red cedar. Pestalotiopsis is more likely to be a problem in wet summers. This fungus usually attacks weakened or damaged plants, but once present it can sometimes cause quite severe die-back. Diseases Pestalotiopsis diebackĪ fungus called Pestalotiopsis is occasionally associated with brown patches, and can be seen as tiny, black fruiting bodies scattered over the affected foliage. If there are similar numbers of scale insects on parts of the hedge unaffected by the dieback then this insect is unlikely to be the primary cause of the problem. Heavy infestations of juniper scale are thought to cause some dieback, but this scale insect is common and is often incidental to the problem. These, like the cypress aphid, feed by sucking the sap from the foliage. Scale insects, usually juniper scale, are found quite commonly in affected areas. There are a number of other aphids that feed on conifers. Clues are sometimes left behind, including cast aphid skins and a black fungal growth ( sooty mould) that grows on the sugary honeydew excreted by the aphids. Large greyish greenfly are sometimes found, but the browning often develops long after the aphids have left the foliage. It is found most often at the base of the hedge, but can develop at any height.
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