Red Rot
Diseases:
Causal Organism= Colletotrichum falcatum
Symptoms=
Ø The first external symptom in red rot appears mostly on third or fourth leaf which withers away at tips along margins.
Ø Typical symptoms of red rot disease in sugercane are observed in the internodes of a stalk.
Ø The disease cane also emits acidic sour smell.
Ø The pathogen also produced Tinh reddish lesions on the upper surface of leaves with dark dot in the center.
Ø The lesions are initially blood red with dark margins and later on with straw-colored centers.
Favourable condition=
Ø Mon-culturing of sugarcane
Ø Water logged condition and injuries caused by insects.
Ø Relative humidity: 4.2-4.5 PH.
Ø Optimum Temperature: 29.4-31 degree.
Disease cycle=
Perennation=
· though plant debris, soil, weed host.
· Fungus is sets- borne also persists in soil on the diseased dumps and stubbles as chlamydospores.
Primary infection=
· thought mainly from infected setts.
Secondary infection=
· thought spread in the field through irrigation water and cultivated tools.
Diagram of red rot disease in sugarcane =
Management=
Cultural method
Ø Adopt crop rotation.
Ø Grow resistant varieties: CO62198, CO7704.
Ø Avoid ratooning of the diseased crop.
Ø Maintain proper moisture in the field.
Ø Avoid water logging condition.
Ø Use proper deranged application in the field.
Ø Proper sanitation application applies in the field. E.g.: soil solarization.
Ø Proper spacing maintain row to row and plant to plant.
Ø Remove infarcted part of the plant.
Ø Apply good weed management practices.
Ø Apply good irrigation application in the filed area.
Chemical method
Ø Soak setts in 0.4%carbendazium solution for 15 min. before planting.
Ø Setts can be treated with aerated stem at 52 degrees from 4-5 hours and by moist air at 54degree for 2 hours.
