Minimising bunch stem necrosis in wine grapes
During bloom, the symptoms of bunch stem necrosis begins as the pedicle elongates. It can become necrotic, resulting in the dropping of the flower buds. Later, entire sections of the inflorescence can shrivel and die, and may or may not drop off. The symptoms appear as necrotic patches on the rachis or pedicle. As a result, the supply of water and nutrients are limited, leading to wine grape berries with less sugar, remain sour and eventually shrivel.
Crop Nutrition and bunch stem Necrosis in Wine Grape
Magnesium
Bunch stem necrosis is often associated with a magnesium deficiency and the imbalance of magnesium and nitrogen. Research suggests that low levels of sugars in storage organs and fruit lead to nitrate accumulation, particularly during cold weather during maturation. Two to three foliar applications of magnesium starting just before veraison minimise the problem.
Recommended Yara fertilisers for grapevines
How nutrient management affects wine grape
Influencing grapevine yield
Increasing grape berry set and weight
Improving grape quality
Influencing grape and wine pH
Grape nutrient deficiencies
Looking for even more information ...
If you would like more information and would like to speak to one of our fruit specialists or area managers please find all their contact details here
Contact your local Yara area manager or agronomist
Where can I buy Yara fertiliser ...
If you would like to find your nearest Yara supplier or merchant simply use this searchable map with all their contact details here.
