The document describes anthracnose, a fungal disease of sorghum caused by Colletotrichum graminicola. Symptoms include leaf spots with white centers surrounded by red, purple, or brown margins and small black lesions. The fungus can also cause stalk rot, seen as discoloration and circular cankers. It is spread primarily through seed and wind-borne spores. Management strategies include destroying plant debris, crop rotation, growing resistant varieties, seed treatment, and fungicide spraying.

1. ANTHRACNOSE
OR
RED LEAF SPOT
OF SORGHUM

2. Casual organism : Colletotrichum graminicola
Symptoms :-
◦ Fungus cause leaf spot (anthracnose) & stalk rot (red rot) in sorghum.
◦ The centre of spot is white in colour encircled by red , purple,or brown
margins.
◦ Small black lessons On white centre – “acervuli”.
◦ The infected stem when split opened ,it shows discolouration giving
marble appearance.
◦ Development of circular cankers on stalk and inflorescence.

4. ◦ Disease cycle:-
◦ Primary infection :- Fungus present in seed,and Johnson
grass,Sudan grass,maize,barley and wheat
◦ . Secondary infection:- Wind born conidia

5. Management:-
◦Destruction of infected plant debris and collateral
hosts
◦Crop rotation with non –host crop
◦Grow resistant varieties like SPV 162, CSV 17, rift
Sudan.
◦Treat the seeds with captain or thiram @ 3g/kg
◦Spray the crop with Mancozeb @ 0.25% or
carbendazim @0.1%