The vine (Vitis vinifera) It is an essential crop in many wine-growing regions, but its profitability and sustainability are continually facing threats. diseases and pests. To know in depth the Symptoms of vine diseases and their most effective treatments It's key to protecting crops and ensuring the quality of wine or table grapes. This definitive guide addresses the most common diseases, their mechanisms of action, specific symptoms, photos, integrated control strategies, and recommendations for ecological and sustainable management, integrating all relevant and up-to-date information.
Importance of detecting and managing diseases in grapevines
The success of a vineyard depends on the early detection of diseases and pests, as well as professional management of phytosanitary treatments and cultural practices. Early diagnosis allows minimize production and quality losses and reduce dependence on chemicals. Keeping detailed records of interventions and combining preventive strategies with curative treatments is essential for a sustainable and profitable management of the vineyard.
Main fungal diseases of the vine: symptoms and treatments
Vine mildew (plasmopara viticola)
El mildew It is one of the most feared diseases by winegrowers around the world. This fungal disease attacks the green organs of the plant and, if left unchecked, can cause partial or total crop lossesIt is common in regions with mild spring and summer temperatures and abundant rainfall.
- Main symptoms:
- Appearance of yellowish, oily-looking stains on the upper surface of the leaves, known as "oil spots".
- On the back there is a whitish powder or fluff, corresponding to the sporulation of the fungus.
- Severely affected leaves eventually dry out and fall off.
- In young bunches: presence of whitish fuzz, S-shaped curvature of the rachis, wrinkled and dried grains.
- Development conditions: Mildew thrives in environments with temperatures higher than 10-13ºC, high relative humidity (over 75%) and presence of free water (rain, dew, excessive watering).
- Treatments and preventive measures:
- Perform preventive treatments with contact fungicides such as copper oxychloride, preferably during the budding period and until flowering, following the "three tens rule" (temperature above 10ºC, rainfall of more than 10 mm and shoots of more than 10 cm).
- Application of systemic and penetrating fungicides (metalaxyl, fosetyl-Al, cyazofamid, among others) in situations of high pressure and when conditions are favorable for secondary infections.
- Cultural management: removal of plant debris, improved aeration by thinning leaves, planting in the direction of the prevailing wind, and use of resistant varieties.
- In organic farming, prioritize plant extracts (e.g. Equisetum arvense) and authorized residue-free products as an alternative to classic fungicides.
Powdery mildew of the vine (Uncinula necator o Erysiphe necator)
El powdery mildewWhite blight, also known as "white blight" or "white blight," is another of the most common and damaging fungal diseases, especially in temperate and dry climates. It can affect any green part of the vine, but causes significant damage to bunches and young leaves.
- Main symptoms:
- Whitish or grayish spots with a floury appearance in leaves, shoots and bunches.
- Leaf deformation and curling, grape cracking and dehydration, reduced photosynthesis and reduced vigor.
- In severe cases, the bunches become covered with white mycelium, cracking, and the quality of the harvest decreases.
- Development conditions: Prefer mild temperatures (20-28ºC) and high humidity, without the need for free water.
- Treatments and preventive measures:
- Systematic use of sulfur in powder or suspension during sensitive stages (budding, pre-flowering, fruit set and veraison).
- Avoid applying sulfur at temperatures above 32ºC to prevent foliar burns.
- Chemical alternative: systemic fungicides (penconazole, fenarimol, triforine), especially in areas where powdery mildew is endemic or in years of high pressure.
- Thinning and orientation of the plantation, selection of less susceptible varieties, elimination of infection foci.
- In organic farming, prefer sulfur and limit the entry of disease by adjusting the vineyard microclimate.
Botrytis or Gray Rot (Botrytis cinerea)
La botrytis It is a saprophytic fungus that primarily affects bunches, especially in the phases prior to the harvest, when environmental humidity is high and there are remains of wounds or openings in the grape skin (caused by hail, pests or heavy rain).
- Main symptoms:
- Appearance of grayish mycelium on bunches and leaves.
- Fruit rot and drying, significant reduction in grape quality.
- Easy detachment of the affected grains, presence of partially dehydrated berries.
- Development conditions: It is favored in conditions of high humidity and moderate temperatures (18-25ºC), after rain, fog or dew, especially in dense clusters.
- Treatments and preventive measures:
- culture control: reduction of vigor, correct pruning and training, elimination of affected bunches, improvement of aeration.
- Preventive application of specific fungicides for Botrytis (procimidone, vinclozolin, anilinopyrimidines, phenylpyrrones, hydroxyanilides, folpet, metconazole, benzidimidazoles).
- Use of copper-based formulations or plant extracts in organic farming.
- Indirect control of pests (such as the bunch moth) that create wounds through which the fungus penetrates.
Anthracnose and other fungal diseases of the vineyard
La anthracnose It is a less common disease, but it is important in areas with humid springs and summers. The fungus causes necrotic lesions on leaves, shoots, and bunches, and can affect vegetative development and grape quality.
- Main symptoms: Dark spots surrounded by a whitish halo, necrotic areas, deformation and burns in affected organs.
- Treatments and preventive measures: Removal of old shoots after pruning, application of broad-spectrum fungicides (mainly copper-based). It is advisable to intervene before the first symptoms appear.
Tinder, Petri disease, eutypia, and botryosphaeria decay
The vine wood diseases (tinder blight, eutypia, Petri disease, botryosphaeria decay) are caused by a complex of pathogenic fungi that generate necrosis and rot in the wood, affecting the longevity and productivity of the vineyard.
- Main symptoms: Reduction of vegetative development, wilting, chlorosis, shortening of internodes, general decline, internal wood necrosis (dark lines, dry or wet rot).
- Entry routes: Pruning wounds, damaged roots, spore dissemination by wind and rain.
- Prevention measures: Disinfect pruning tools, apply fungal sealants to cuts, remove and destroy infected wood, choose tolerant rootstocks and varieties, and avoid wet pruning.
- There are no effective curative treatments, so the prevention is essential.
Main vine pests: identification and treatments
Cluster moth (Lobesia botrana)
La cluster moth It is one of the most damaging pests, as its larvae bore into berries and bunches, promoting the entry of pathogens such as Botrytis. You can learn more about how to detect and treat this pest in our dedicated guide. on crop pests.
- Symptoms: Presence of holes in the berries, silk threads between fruits, dehydration and rot, presence of pupae on the bark and leaves.
- Development: It can have up to 3-4 generations per campaign, with the second and third being the most damaging.
- Controls:
- Application of insecticides at the optimal time (egg hatching).
- Alternative methods: pheromones for sexual confusion, use of Bacillus thuringiensis At temperatures above 20ºC, repeated treatments depending on intensity.
- Regular monitoring (traps, direct observation) to adjust treatment timing.
Red spider (Tetranychus urticae), mites and yellow spider
The Mites, such as the red spider and the yellow spider, cause damage to leaves and shoots, resulting in loss of photosynthetic area and general weakening. You can consult control techniques at problems in plants.
- Symptoms: Necrotic pits, yellowish-green areas, spots on leaves that may dry out and fall off, presence of fine cobwebs (in cases of severe infestation).
- Control measures: Use of specific acaricides Upon detecting the pest, proper pruning management is carried out to eliminate overwintering eggs, and application of ecological treatments in the absence of residues.
- Improving fertilization and plant vitality to reduce susceptibility.
Green mosquito (Empoasca spp.)
El green mosquito It primarily affects the leaves, where it causes progressive drying from the edges inwards, with reddish edges (in red grapes) or yellow edges (in white varieties). For more information on problems affecting different species, visit mosquito repellent plants.
- Damage: Reduced vigor, decreased photosynthesis, development of necrotic processes in leaves and, in severe attacks, weakening of the strain.
- Control: Application of authorized insecticides when pressure is high, frequent monitoring, and enhancement of natural enemies to avoid unnecessary treatments.
Mealybug and other secondary pests
La mealybug (Planococcus ficus and other species) feeds on vine sap, injects phytotoxic saliva, weakens the plant, and can transmit viruses and attract protective ants. Biological management can be effective in these cases; more information at health and forest management.
- Symptoms: Weak plants, sticky leaves, presence of honeydew, attraction of ants and appearance of sooty mold (superficial fungus).
- Control: Monitoring and localized treatments, applying insecticides only when the incidence requires it, controlling anthills, and post-harvest measures.
Integrated strategies for sustainable prevention and control
The integrated control strategies and sustainable management are vital for vineyard protection and risk reduction.
- Cultural practices: Orient the planting according to the wind, thin leaves to improve ventilation, remove infected pruning debris, combine rational fertilization, and avoid excess nitrogen.
- Monitoring and registration: Maintain up-to-date records of treatments and tasks, and use farm management software to improve traceability and regulatory compliance.
- Rotation of phytosanitary products and alternation of active ingredients to reduce resistance.
- Selection of resistant varieties or tolerant to the most serious diseases.
- Search for ecological alternatives with authorized products, plant extracts, and integrated pest management to sustain long-term profitability.
Recommended schedule of interventions and monitoring
The effectiveness of disease and pest control depends on acting on the most favorable phenological moments and at the appearance of the first signs.
- Budding: Initial preventive applications against mildew and powdery mildew, and wound treatment with sealants in cases of wood diseases.
- Pre-flowering and flowering: Check for symptoms on young leaves and apply booster treatments if favorable conditions appear.
- Fruit setting and development: Control of moths, powdery mildew, downy mildew, and botrytis, adjusting treatments based on monitoring.
- Veraison and ripening: Monitor for the appearance of botrytis and moth attacks in the second and third generations.
- Postharvest: Assessment of health status, implementation of ecological preventive measures to minimize pressure on the next campaign.
The knowledge and professional application of the strategies described here allow for the development more resilient, productive and sustainable vineyardsThe integration of new technologies, the promotion of functional biodiversity, and the ongoing training of winegrowers are the foundation of the future of viticulture.
Master the Symptoms, causes, and treatments of vine diseases and pests It makes the difference between a vulnerable vineyard and one capable of overcoming environmental challenges, increasing profitability, and producing exceptionally high-quality products. Applying a comprehensive approach, tailored to the climatic and varietal conditions of each farm, is the best guarantee of success for any winemaking project.
