ISHS Acta Horticulturae 291: III International Mango Symposium
SIGNIFICANCE OF TWO MANGO FLOWER DISEASES IN THE DRY TROPICS |
| Authors: | R.A. Peterson, L.G. Schipke, P.C. Clarkson |
| Abstract:
The importance of the mango flower diseases, anthracnose (Colletotrichum qloeosporioides var. minor) and powdery mildew (Oidium manqiferae) was examined during two seasons in the Mareeba area. The Mango Anthracnose Estimator (MAE) was used to monitor weather conditions and record infection periods. A range of fungicides with reported activity to the organisms were applied to 6 year old Kensington Pride trees at 14 day intervals from early flower emergence. In 1987, conditions were dry. Rain was recorded on two occasions and the MAE registered infection levels of 24 and 32%. A low level of anthracnose was recorded on a few panicles of unsprayed trees, but fruit set was not affected. In 1988 conditions were relatively wet with 7 wet periods during flowering and early fruit set (18 August to 2 November). MAE infection levels ranged from 29–85%. Anthracnose was only recorded at a low level on a few panicles early in the flowering period. Fruit set was not affected by the disease levels and fruit numbers per panicle were similar for all treatments. Powdery mildew incidence in 1987 was low on up to 23% of panicles on unsprayed trees and 11.5% of mancozeb sprayed trees. Fruit set was similar on all trees irrespective of the presence of the disease. | |
Download Adobe Acrobat Reader (free software to read PDF files) | |
