The scab fungus overwinters in several ways: As the sexual state (pseudothecia) on overwintering leaves on the orchard floor or on trees as mycelium On wood scab lesions on shoots On bud scales On leaves remaining on shoots On unsealed buds or shoot tips …
Apple scab infects most parts of the tree including leaves, petioles, blossoms, sepals, fruits, pedicels, shoots, bud scales. Symptoms are most easily observed on leaves and fruit. Leaves As leaves first emerge in spring, the lower surface is …
Visual assessment Scab monitoring and forecasting is an essential part of integrated disease management to rationalise fungicide use. However, it is not possible in the early part of the season to base decisions on fungicide use on assessment of visible …
To better target fungicide sprays to control scab, the concept of curative spraying was developed, based on the use of curative fungicides in relation to scab infection periods. 1. Scab infection model – Mills The first scab infection prediction schemes …
Prune trees to allow good air circulation and rapid drying of leaves to reduce scab risk. Remove wood scab during winter pruning. After harvest and before leaf fall, apply a spray of 5% urea to the trees. Urea encourages microflora that speed up leaf …
Apple scab control is based on use of fungicides in an integrated programme from bud burst to the end of scab risk. Classification of fungicides Fungicides recommended for control of apple scab are classified as: Protectants Chemical activity that …
Where a new orchard is planned, consideration should be given to choice of variety and if possible selecting a scab resistant or tolerant variety , or if this is not possible, then avoiding very susceptible varieties such as Gala. Select an orchard site …
Biocontrol measures generally only reduce scab, rather than control it and are therefore probably not effective enough for use during the growing season. There may, however, be more scope for use post-harvest with urea to encourage leaf rotting and …
MacHardy, W E (1996). Apple scab. Biology, Epidemiology and Management. APS, Minnesota, USA. …
Disease status Other hosts Distribution Varietal susceptibility Disease cycle and epidemiology Symptoms and recognition Disease monitoring Forecasting apple scab infection Potential ascospore dose (PAD) Cultural control Chemical control Control in organic …
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