Symptoms
| Symptoms Minute specks surrounded by a pale green halo Spots with greyish white centre and deep brown margin are visible on the leaf Spots coalesce to form brown patches restricted by veins Identification of pathogen Cluster of conidiophores emerge through stomata or epidermis Conidia are elongated, slightly curved, multiseptate, truncate at the base and narrow at the tip Favourable Conditions High relative humidity and temperature between 24-29° C Leaf wetness during night with dry conditions during the day Mode of Spread and Survival Dormant mycelium in the plant debris Spreads through wind borne conidia Management Spray mancozeb 72 WP @ 1000 g/ha |
- Minute specks surrounded by a pale green halo
- Spots with greyish white centre and deep brown margin are visible on the leaf
- Spots coalesce to form brown patches restricted by veins
Identification of pathogen
- Cluster of conidiophores emerge through stomata or epidermis
- Conidia are elongated, slightly curved, multiseptate, truncate at the base and narrow at the tip
Favourable Conditions
- High relative humidity and temperature between 24-29° C
- Leaf wetness during night with dry conditions during the day
Mode of Spread and Survival
- Dormant mycelium in the plant debris
- Spreads through wind borne conidia
- Spray mancozeb 72 WP @ 1000 g/ha