Nice photographs, but they are of Erythrina suberosa.
--- On Tue, 6/8/10, Rajesh Sachdev <leopa...@gmail.com> wrote:
Erythrina variegata [previously E.indica] is the Indian Coral Tree and there is one with pure white flowers which is called E.variegata var.alba.
Dear Ashwin Ji & Gurcharan ji,
It is quite hard to determine a disease without any photographs and information [or very small set of information]. India being a tropical country each and every day new pathogenic varieties develops and devastates plant life. Hence it will be ambiguous to predict without proper sighting of the diseased host.
There are more than 100 reports from all over the world regarding disease of Erythrina sp and about 20 species of the plant has been victimised. As far as you (Ashwin ji) suggest about the symptoms I think there is no possibility of virus infection. Viruses are obligate parasite hence they never tend to show such symptoms where there are no potent tissues left in the plant for it to multiply. Fungi and insect can be brought into consideration in this case.
As said by Gurcharan ji, I will like to tell that aphids and fungus do sometimes co-exist as many times aphids are regarded as the plant disease vectors. Really do some species of aphids shows a woolly mass which may look like fungal mycelium but pathologists are never fooled by such characters because externally developed mycelium generally show saprophytic mode of nutrition . In most of the fungal disease around the world the pathogen develops inter or intra cellularly. Hence aphids can be good choice as they tend to extract nutrition from the living tissue and molt it which may look like the black tar as said by Ashwin Ji.
I can’t confirm regarding the disease extremely sorry for it, only report that I found was in Current Science hence I tried to focus it, without proper disease reports it hard to determine.
I am attaching the pdf copy of the report.