What are the symptoms of Aonla rust disease and how it can be managed?

It is also known as ring rust of aonla. It is caused by Ravenelia emblicae var. fructoidae. The conspicuous black pustules appear on leaflets and fruits which later form a ring, join together covering a large area. Pustule’s rupture exposing black spore mass. Pinkish pustules develop on leaves which may be isolated or in group. The affected fruits drop off prematurely. Desi variety is highly affected but Chakaiya and Banarasi are free from it.

It can be controlled by 3-4 sprays of wettable sulphur @ 5 g/l of water at an interval of one month or mancozeb @ 2.5 g/l of water at an interval of 15 days.