Sugar volcanoes - observed on Harpephyllum caffrum (Wild Plum) and Persea americana (Avocado)
Resin/gum beads - as observed in Searsia lancea (Black Karee) and Acacia karoo (Sweet Thorn)
Milky beads like drops of Alcolin - as observed in Olea europaea africana (Wild Olive) and Ficus elastica (Rubber tree)
Heaps of sawdust - as observed in Quercus robur (English Oak) and Acer buergerianum (Chinese Maple)
Wet stains - as observed in Platanus x acerifolium (London Plane) and Populus sp. (Poplar)
Sugary strands - as observed in Brachychiton acerifolium (Australian Flame Tree)
To be sure of your identification of PSHB, remove the piece of bark around the hole. You should see a tiny pinhole with a dark stain around it, caused by the fungus
The PSHB problem should be treated as quickly as possible as this beetle has the potential to drastically change our urban areas and natural systems. The disappearance of trees could affect birds, insects and browsers and change the face of Africa.
The potential for devastation of food bearing trees could impact negatively on the economy and the provision of jobs in the agricultural sector.
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