Troubleshooting
Grape 'Himrod' problems — and how to fix them
Grape 'Himrod' (Vitis vinifera × labrusca 'Himrod') is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Powdery and downy mildew
Whitish bloom on leaves and berries in humid weather. 'Himrod' has fair powdery-mildew resistance, but open up the canopy and remove suckers to keep foliage dry.
Black rot
Small brown leaf lesions then shrivelled, mummified berries. Strip and bin mummies, clear fallen debris over winter, and prune for airflow to break the cycle.
Birds and wasps
Sweet thin-skinned berries are heavily targeted as they ripen. Net clusters or bag individual bunches once they begin to colour.
Poor fruiting from over-vigour
Lush leafy vines with few bunches usually mean too much nitrogen or no proper pruning. Spur- or cane-prune hard each dormant season and ease off feeding.
Prevent grape 'himrod' problems before they start
Most grape 'himrod' issues are care-mismatch, not bad luck. Dial in the basics:
Looking for grape 'himrod' in general rather than its problems? Read the full grape 'himrod' care guide — light, water, soil and feeding.
Grape 'Himrod' problems — FAQ
Why is my grape 'himrod' powdery and downy mildew?
Whitish bloom on leaves and berries in humid weather. 'Himrod' has fair powdery-mildew resistance, but open up the canopy and remove suckers to keep foliage dry.
Why is my grape 'himrod' black rot?
Small brown leaf lesions then shrivelled, mummified berries. Strip and bin mummies, clear fallen debris over winter, and prune for airflow to break the cycle.
Why is my grape 'himrod' birds and wasps?
Sweet thin-skinned berries are heavily targeted as they ripen. Net clusters or bag individual bunches once they begin to colour.
Why is my grape 'himrod' poor fruiting from over-vigour?
Lush leafy vines with few bunches usually mean too much nitrogen or no proper pruning. Spur- or cane-prune hard each dormant season and ease off feeding.