Anthracnose disease:
Causal Organism=Colletotrichum capsici
Symptoms=
· In anthracnose disease the pathogen infected the seedlings and produces small radish circular spots on the cotyledons and primary leaves.
· The lesions develop on collar region, stem may be girdled, causing seedling to wilt and die.
· In natural plants, the fungus attacks the stem, leading to stem splitting and shredding of bark.
· The most common symptom in boll spotting, small water soaked, circular, reddish brown depressed spots appear on the bolls.
Favourable condition=
· Prolonged rainfall at the time of boll formation.
· Close planting.
· Warm and humid weather.
· Optimum temperature=29 to 33 degree.
Disease cycle=
Perennation=
· The pathogen survives as dormant mycelium in the seed for as conidia on the surface of seed for about a year.
Primary infection=
· The pathogen also perpetuates on the rotten bolls and other plant debris in the soil.
Secondary infection=
· Through air borne conidia
Anthracnose disease cycle diagram=
Management=
Cultural Method
· Remove and burn the infected plant debris and bolls in the soil.
· Proper field sanitation application applies in field.
· Proper tillage application applies in field.
· Proper weed management application applies in field.
· Remove all infarcted part of the plant.
· Use disease registrant varieties.
· Proper spacing maintain between row to row and plant to plant
· Proper drained facility available in filed area.
· Proper light or ventilation maintain in the field.
Chemical Method
· Treat the delinted seed with carbendazim or carboxin or thiram or coptan at 2g/kg.
· Spray the crop at boll formation stage with mancozeb 2kgon copper oxychloride 2.5kg.
