Sunken dark spots with rings on my chilli fruits that rot and dry on the plant

Sunken dark spots with concentric rings on ripening chilli fruits that rot and dry, along with dieback of branch tips in humid weather, are anthracnose, also called fruit rot and dieback, caused by Colletotrichum. It hits ripe and ripening fruit hardest and spreads in wet humid conditions and through infected seed. Use clean disease free or treated seed for the next crop, since seed carries the fungus. Remove and destroy infected fruits and dead twigs to cut the source, harvest ripe fruit promptly so it does not sit and infect, and improve airflow and drainage. Spray a protectant such as mancozeb or copper at flowering and fruiting, and use a systemic like azoxystrobin or a difenoconazole if it is advancing, rotating groups. Avoid overhead irrigation late in the day. As chilli is eaten and often dried, follow the label and waiting period, and confirm with your KVK before spraying.