Sunflower Spraying with Drone – Precision Field Treatment
Bulgaria is the leading sunflower producer in the European Union. With areas of over 800,000 hectares, the country ranks first in the EU for sunflower seed production. This crop is of strategic importance for Bulgarian agriculture and the oil industry.
Successful sunflower growing requires effective crop protection – timely fighting of diseases, weeds and pests. Sunflower drone spraying is establishing itself as a modern solution that provides precise treatment, reduces losses and increases crop protection effectiveness.
Why Sunflower Needs Precise Protection
Sunflower is susceptible to a number of diseases and pests that can reduce yield by 20–50% in unfavourable conditions. The main threats are:
Sunflower Diseases
- White rot (Sclerotinia sclerotiorum) – one of the most dangerous diseases, can destroy entire fields. Develops in wet conditions and can cause losses up to 50% of the harvest
- Downy mildew – causes systemic disease of plants, leaf and capitulum deformation
- Phomopsis (Diaporthe helianthi) – affects stalks and causes their bending, especially at ripening
- Alternaria – causes dark spots on leaves and capitula, worsens seed quality
- Grey rot (Botrytis) – attacks capitula in wet weather
Pests
- Sunflower moth (Homoeosoma nebulella) – larvae feed on seeds in the capitulum
- Aphids – vectors of viral diseases
- Wireworms – damage the root system
Timely sunflower drone spraying enables fast and effective intervention against any of these threats.
When to Spray Sunflower – Optimal Moments
To understand in detail when to spray sunflower, it is important to know the crop's development phases.
Herbicide Treatment (2–6 Leaf Phase)
Weed control is of primary importance in the early development phases of sunflower. Weeds compete for water, light and nutrients and can significantly reduce yield.
With a drone, herbicide treatment is performed fast and without soil compaction. Precise GPS navigation guarantees uniform coverage without gaps.
Fungicide Treatment (Budding Phase)
In the budding phase (BBCH 51–55) is the appropriate moment for prophylactic fungicide treatment against Sclerotinia and Phomopsis. The drone provides excellent coverage of the leaf mass and the upper part of the plants.
Treatment During Flowering
If diseases are identified during flowering, drone spraying is the preferred method. Sunflower is already tall (1.5–2 metres) and ground machinery would cause significant trampling. The DJI Agras T50 flies above the crop and treats effectively without damaging a single plant.
Late Treatment (Seed Filling)
In this phase additional fungicide spraying may be needed, especially in wet conditions when the risk of grey rot and Alternaria is elevated. The drone is practically the only effective way to treat in this phase.
Advantages of Drone Spraying for Sunflower
Zero Crop Trampling
As with corn, sunflower reaches significant height. Ground sprayers trample 3–5% of the crop with every pass. With a drone this loss is zero.
Precision Coverage
The DJI Agras T50 that AirAgro uses disperses preparations with fine dispersion, providing excellent coverage of the leaf surface. The special nozzles and the airflow from the drone rotors help the preparation reach even the underside of leaves.
Speed and Effectiveness
The drone treats up to 200 decares per hour, meaning a large field of 1,000–2,000 decares can be treated in a single day. This is critical when disease threatens, where every lost day means greater damage.
Work in Complex Conditions
After summer rains fields can be inaccessible to heavy machinery. The drone can work immediately, without waiting for the soil to dry. A detailed comparison between the two methods can be found in the article drone or tractor for spraying.
Reduced Water and Preparation Use
The drone works with Ultra Low Volume (1–2 litres per decare), meaning significantly less water consumption and more efficient use of preparations.
How Sunflower Drone Spraying Works
Step 1: Assessment and Consultation
The AirAgro team will assess the condition of your crop and recommend an appropriate treatment plan. Preparations, dosages and optimal spraying moment are determined.
Step 2: Field Mapping
The field GPS coordinates are entered into the drone navigation system. Boundaries, flight route and spraying parameters are determined.
Step 3: Solution Preparation
Preparations are prepared in precise proportions. With sunflower, fungicides are often combined with insecticides or foliar fertilizers for complex treatment.
Step 4: Automated Spraying
The DJI Agras T50 takes off and follows the pre-set route with GPS precision. Spraying is fully automated – the drone maintains constant height, speed and dosage.
Step 5: Report and Tracking
After treatment the grower receives a report on the treated areas, preparations used and working conditions. This is important for documentation and future planning.
Practical Recommendations for Sunflower Growers
Prevention Is the Key
Do not wait for disease to develop massively. Prophylactic fungicide spraying in the budding phase is much more effective than attempts to treat an already developed infection.
Choose the Right Moment
Spray in early morning hours or in the evening when:
- Temperature is between 15°C and 28°C
- Wind is up to 3–4 m/s
- Humidity is above 50%
- No rain expected in the next 2–3 hours
Preparation Rotation
To prevent resistance development, change active substances from season to season. The AirAgro team can advise on appropriate preparations.
Monitor Fields
Regular inspection of sunflower fields allows early identification of problems. At first signs of disease, contact AirAgro for rapid response.
Sunflower in Bulgaria – Significance and Prospects
Bulgaria is the EU leader in sunflower production, and the oil industry is of strategic importance for the national economy. The main sunflower growing regions include Dobrudzha, Ludogorie, the Thracian Plain and the areas along the Danube.
AirAgro serves sunflower farms in the most important production regions – from the vast fields in Dobrudzha to the Thracian Plain around Plovdiv, Stara Zagora, Pazardzhik and Haskovo. We know the specifics of each region and guarantee timely response when treatment is needed.
With global warming and changing climate conditions, disease and pest pressure increases. Modern technologies such as drone spraying give farmers a tool for fast and effective response, which is a prerequisite for stable and high yields.
More about the benefits of drones in agriculture can be found in our blog.
Price of Sunflower Drone Spraying
The price depends on the area, number of treatments and location. For detailed information see drone spraying prices. As a rule, the larger the area, the more favourable the price per decare.
Do not forget to calculate the savings – zero trampling, less preparation consumption and better treatment effectiveness. In the overall calculation, drone sunflower spraying often proves more economical than ground methods.
Frequently Asked Questions
Can the drone cover large sunflower areas?
Yes. With the DJI Agras T50 it is possible to treat 1,500–2,000 decares per day. For very large areas AirAgro can organise work with multiple drones simultaneously.
Is the drone effective against Sclerotinia?
The drone is a means of applying the preparation, and effectiveness depends on the choice of fungicide and timeliness of treatment. With the right moment and preparation selected, drone spraying is extremely effective against Sclerotinia.
Can preparations be combined in one spraying?
Yes, provided the preparations are compatible. Combining a fungicide with an insecticide or foliar fertilizer is commonly practised. The AirAgro team will advise on appropriate combinations.
Request a Free Consultation for Sunflower Drone Spraying
Do not let Sclerotinia and pests reduce your yield – act proactively with AirAgro!
Here is what we offer:
- Free consultation and farm inspection – our agronomist will visit your sunflower fields and assess the phytosanitary situation
- Individual treatment plan – a detailed seasonal schedule for herbicide and fungicide treatments tailored to your hybrid and region
- Drone demonstration of the DJI Agras T50 – see on-site how the drone treats up to 200 decares per hour without trampling the crop
- GPS precision – uniform coverage without gaps and overlap
We serve sunflower regions of Dobrudzha, the Thracian Plain, Plovdiv, Stara Zagora, Pazardzhik, Haskovo and throughout the country.
Contact us:
- 📞 Call us at +359 884 242 406 for a free consultation
- 🌐 Visit airagro.bg and request a farm inspection
- 📋 See the full list of our drone spraying services
The first step is free – call and request a consultation and farm inspection. We will prepare a treatment plan that will protect your sunflower and ensure maximum yield!
