Index
1- What is grapevine anthracnose?
Grapevine anthracnose is a wood disease caused by the fungus Glocosporium ampelophagum.
The fungus winters on the affected branches and in spring gives rise to the conidia, which are the cause of the disease.
It is a disease that can occur sporadically in the vineyards of northern Spain, due to its requirement in humidity.
Climatic conditions have a great influence on the development of “anthracnose”, which thrives mainly in areas with hot and humid springs and summers.
Rain, dew and morning mists create an optimal environment for the spread and development of the disease, heat being less important, which is why the first attacks can occur with relatively low temperatures.
2- What are the Symptoms and damages produced by grapevine anthracnose?
The “anthracnose of the vine” can attack all the green organs of the vine, producing lesions in them that are characterized by the presence of a central whitish area surrounded by a black halo.
In vine shoots:
It is in the still herbaceous shoots where the attacks mainly occur.
At first , some isolated light-brown, livid spots appear, which with high temperature and humidity rapidly increase in size and darken. Later, the spots acquire a pinkish gray color, with black edges.
When the lesions are numerous , the shoots appear as burned, they are short, sinuous, crooked and have numerous secondary and tertiary branches that give the strain the appearance of a scrub.
In sheets:
Initially, small circular black spots are seen that later increase in size, acquire a greyish-white color, dry out, fall and leave irregularly shaped holes in the leaves surrounded by a purplish-black border.
In the inflorescences:
When the attack is very intense they dry out completely and the loss of the harvest is total.
In the berries:
Black spots appear that become discolored in its center, obtaining a greyish white, peeling off the affected skin. The grains may fall out.
3- Strategy and means of protection against anthracnose of the vine:
It is recommended to collect the shoots after pruning and burn them.
An early treatment is necessary in spring, at the appearance of the third leaf, the following active ingredients being recommended:
✅ Active Materials recommended for the control of anthracnose in professional viticulture:
| Active matter control anthracnose | Dose | Product |
| Cymoxanil 3% + Copper Oxychloride 15% + Zineb 15% | 0.40% | Wettable powder |
| Mancozeb 10% + Copper Oxychloride 30% + Zineb 10% | 0.30% | Wettable powder |
| Mancozeb 12% + Copper Oxychloride 8.6% + Copper Sulfate 2.5% + Basic Copper Carbonate 2.8% | 0.40-0.60% | Wettable powder |
| 40% Mancozeb + 11% Copper Sulfate | 0.30% | Wettable powder |
| Mancozeb 8% + Sulfato cuprocálcico 20% | 0.40-0.60% | Wettable powder |
| Maneb 20% + Copper Oxychloride 15% + Zineb 15% | 0.40-0.50% | Wettable powder |
| Maneb 8% + Sulfato cuprocálcico 20% | 0.40-0.60% | Wettable powder |
| Cuprous oxide 50% | 300 g / 100 liters of water | Wettable powder |
| Oyster 50% | 0.35-0.50% | Concentrated suspension |
| Zineb 80% | 0.25% | Wettable powder |
Other articles related to pests and diseases of the vine are:
- Vine tinder. Definition, symptoms, damage and control.
- Downy of the vine. Characteristics, damage and control.
- Powdery mildew of the vine in vineyard. Symptoms, damage and control of the disease.
- Botrytis of the grape. Definition, symptoms and recommendations for control.
- Green mosquito on the vine. Description, characteristics and treatment of the pest.
