Studies on the brown-eye-spot disease of coffee
1. In the brown-eye-spot disease (Cercospora coffeicola Berk. et Cooke) of coffee, the first visible foliar symptom is the appearance of small, necrotic spots, which later develop and coalesce followed by yellowing and epinasty of leaves culminating in defoliation. Both biological and chemical tests revealed the emanation of ethylene from Cercospora infected coffee leaves. 2. All the cultivated arabica cultivars as well as robusta are susceptible. 3. Hot humid conditions and sudden removal of nursery pandal, exposing seedlings to direct sun are conductive for the occurrence and spread of the disease. 4. Mostly seedlings in the nursery and young plants in new clearings suffer to a large extent due to this disease. 5. Survival studies indicated the ability of the pathogen to infect the three commonly occuring weeds in coffee estates - Bidens pilosa (Spanish needle), Chenopodium ambrosoides (Worm seed or Mexican tea), and Ricinus communis (castor), which serve as collateral hosts and also to survive on fallen debris in the soil. 6. Cross inoculation studies indicated that the pathogens causing brown-eye-spot and berry blotch, though appear to the morphologically alike, are two distinct strains. 7. Control measures consist of (a) using organic fungicides, (b) avoiding exposure of seedlings to direct sun, (c) destroying the collateral hosts in the vicinity, and, (d) maintaining proper nursery and field sanitation
| Main Authors: | , |
|---|---|
| Format: | biblioteca |
| Published: |
Mar
|
| Subjects: | ENFERMEDADES FUNGOSAS, COLLETOTRICHUM, SINTOMAS DE ENFERMEDADES (PLANTAS), HOSPEDEROS, CONTROL DE HONGOS, CONTROL CULTURAL, CONTROL QUIMICO, FUNGICIDAS, CERCOSPORA COFFEICOLA, |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|