How the stability of trees infected with BRR disease may be ascertained?
Since BRR disease causes root rot at the lower trunk above grade level (e.g. it could be observed up to 2 m in some tree species) and/or root collar and/or […]
Is it difficult to diagnose BRR disease on trees in early stage of infection?
Yes, early diagnostic symptoms of BRR disease are often difficult to detect, despite the fact that the disease can cause a rapid decline in tree growth conditions within a short […]
Are tools required in checking the lower trunk, root collar and individual roots of trees?
Yes, root excavation with appropriate tools (e.g. handheld adze, digger, air spade, etc.) may be required to expose the root collar and roots. The exposed root collar and roots could […]
Elaborate on the typical signs of BRR disease to look for at the lower trunk, root collar and individual roots of the trees
The typical signs of BRR disease are a) fruiting bodies of Phellinus noxius, b) mycelial encrustation, c) soil aggregates and d) mycelial nets. (a) The appearance, on lower trunk or […]
Are the general symptoms observed on tree crown unique to BRR disease?
No, the abnormal crown symptoms are commonly associated with root diseases and malfunctions, and are not unique to BRR disease. Thus, it is important to further examine the lower trunk, […]
What crown symptoms are observed on trees with BRR disease?
Symptoms of the disease are of two types, namely slow decline and rapid decline. For trees experiencing slow decline, the most noticeable symptoms may include crown thinning out gradually and […]
How is BRR disease detected through field diagnosis?
Field diagnosis through visual tree assessment is based on observable symptoms and signs of BRR. There are two steps. Step 1: Identify abnormal crown symptoms (e.g. sparse foliage density, abnormal […]
What are the methods available for diagnosis of BRR disease on trees?
There are currently two main levels of diagnostic methods available for determination of BRR disease in trees, namely field diagnosis through visual tree assessment and laboratory diagnosis through fungal isolation […]
Is there an effective cure to BRR disease?
According to literatures and expert opinion, there is yet to be an effective cure for BRR disease.
What are the geographical ranges of BRR disease?
The disease is prevalent in tropical and subtropical regions in different part of the world and has been found in Asian countries & regions such as Japan, Mainland China, Hong […]