Getting rid of the pine processionary caterpillar in Málaga: a complete guide to protecting your family and pets
On the Costa del Sol, pine trees are everywhere. We find them in gardens, residential developments, country estates and along the seafront promenades. But every spring, one particular pine becomes a nightmare for many families: the pine infested with processionary caterpillars.
If you have ever seen those white bags hanging from the branches, or found a “procession” of brown caterpillars making their way down the trunk, you will know exactly what we mean. And if you have young children or a dog at home, this insect is probably already on your list of worries.
Let’s be clear: the pine processionary is not just a cosmetic problem. It is a real health hazard and, without the right treatment, it can become a chronic problem that comes back year after year.
What exactly is the pine processionary caterpillar?
Thaumetopoea pityocampa is a moth whose larvae – the well-known caterpillars – build distinctive white silk nests in pine trees. These nests are not decoration: they are shelters where the caterpillars protect themselves from the cold and from predators throughout the winter.
What makes this pest special is its stinging hairs: microscopic, but loaded with a toxin called thaumetopoein (also known as thaumatoxin). These hairs, which measure only 0.1 to 0.25 mm, break away easily from the caterpillar’s body and travel through the air, especially on windy days.
And here is the catch: the caterpillar does not need to touch you directly to cause problems. It is enough for those hairs to float in the air and settle on your clothes or your terrace, or even drift in through an open window.
The most common symptoms caused by the pine processionary
The effects of the toxin can show up in several ways, and not everyone reacts in the same way. Some people are more sensitive than others, but the most common symptoms include:
- Skin reactions: intense itching, redness, hives or small blisters wherever the hairs have touched the skin.
- Eye problems: conjunctivitis, irritation, watery eyes and swollen eyelids. It is very common for children to rub their eyes after playing under an infested pine and end up with red, swollen eyes.
- Breathing problems: sneezing, coughing, difficulty breathing or even asthma attacks in sensitive people. The finest hairs can reach deep into the airways.
- Digestive reactions: if a child puts their fingers in their mouth after touching a caterpillar, they may suffer stomach pain, nausea or swelling of the tongue and throat.
The special case of pets
Dogs are especially vulnerable to the pine processionary. Why? Because when the caterpillars come down the trunk to bury themselves and form their chrysalises, dogs instinctively sniff them or try to bite them. The result is often dramatic: severe swelling of the tongue, which can become necrotic and, in the most serious cases, has to be partially amputated.
Every year, hundreds of dogs in Málaga and on the Costa del Sol fall victim to close contact with this caterpillar. In many cases the outcome can also be fatal if action is not taken in time.
When does the pine processionary appear?
The processionary has a very marked annual life cycle, and it is worth knowing it so you can act at the right moment:
- October–December: the ideal period for preventive treatments (endotherapy). The moths have already laid their eggs and the young larvae are developing in the pine.
- January–March: the white silk nests are most visible in the trees. The caterpillars grow and get bigger.
- March–May: the critical period. The mature caterpillars come down the trunk in procession to bury themselves in the soil. This is when the risk of contact is highest, because the stinging hairs spread easily.
- May–June: the caterpillars turn into chrysalises underground and, weeks later, emerge as adult moths that will lay their eggs in the pines again, completing the cycle.
How to spot the processionary in your pine trees
A processionary infestation is not always easy to identify at first, but there are several signs you can look out for:
1. The white nests
The clearest sign is the white silk bags hanging from the branches. They are easy to see from the ground and tend to cluster in the crown of the tree. A single nest can house hundreds of caterpillars.
2. The processions on the trunk
When the caterpillars are ready to come down to the ground, they form those distinctive lines we have all seen at some point: one behind the other, moving down the trunk like a brown river. They are easy to spot if you walk past the tree.
3. Loose hairs
If you see tiny white specks floating in the air around the pines, or building up on terraces and railings, they are probably the stinging hairs that have already come loose.
4. Your pet’s behaviour
If your dog starts constantly rubbing its face, licking a lot or has watery eyes during the spring, it may have come into contact with processionary caterpillars on its usual walks.
Pine processionary treatments: prevention and action
There are two main approaches to tackling this pest: preventive (the most effective) and reactive (when the nests are already visible).
Endotherapy: prevention with almost 100% effectiveness
The technique that gives the best results is endotherapy, a preventive treatment that involves injecting a systemic product into the trunk of the pine between October and December. The product travels through the tree’s sap and makes the needles toxic to the caterpillars when they feed on them, preventing them from building their distinctive nests.
Why does it work so well? Because it attacks the caterpillar at its food source, before the nest is visible. It is like putting an invisible shield around the tree.
At RapiPlaga we have been successfully applying endotherapy against the pine processionary for years, on thousands of pines in Málaga and on the Costa del Sol. Our staff have specific training and the right protective equipment to work safely at height. And if, by any chance, the treatment does not work and you see the white bags of the nests, we will fit a caterpillar trap ring free of charge.
Trap rings: a mechanical barrier against the processions
When there are already visible nests in the pines, trap rings are a very effective solution. They are fitted around the trunk and act as a trap: the caterpillars come down the trunk, get caught in the ring and die without spreading their stinging hairs.
It is a mechanical method (no chemicals) that works very well when combined with other treatments. It is also safe for pets and children because it stops the caterpillars from reaching the ground.
Spraying the nests: a shock treatment
For severe infestations, we can also spray the nests
Is pine processionary treatment safe?
Yes, completely. Endotherapy, trap rings and spraying all use products and techniques that are safe for people, pets and the environment. The treatments are applied at the right dose and at the best moment in the caterpillar’s life cycle, keeping any impact to a minimum.
Our staff are also highly qualified and very experienced. If you need a treatment, don’t hesitate: count on RapiPlaga, fast and effective. At your service 365 days a year.
The areas of Málaga most affected by the pine processionary
In Málaga and on the Costa del Sol, the areas with the most pine trees are the ones with the most processionary cases:
- Sierra Blanca (Marbella) and Sierra Bermeja (Estepona)
- Alhaurín el Grande and Alhaurín de la Torre
- Mijas and Benalmádena
- Estepona and its surrounding woodland
- Fuengirola and Torremolinos (parks and gardens with pine trees)
- Coín and the Guadalhorce Valley
But you don’t need to live in the countryside. Many residential developments and homes across the province have infested pines that affect residents every spring.
Frequently asked questions about the pine processionary
How long does an endotherapy treatment last?
Endotherapy protects the pine for a whole year. That is why it is essential to repeat it every autumn (October–December) to keep the protection going.
Can any type of pine be treated?
Yes, endotherapy works on all the pines commonly found in the area: Aleppo pine, stone pine and Canary Island pine. What matters is that the tree has a large enough trunk diameter to receive the injection.
How much does it cost to get rid of the pine processionary?
The price depends on the number of trees, their height and the distance from our premises. A single pine can be treated at a very affordable price, and the bigger the garden or estate, the lower the cost per tree.
Do the caterpillars always come down the same trunk?
Not necessarily. Each nest has its own route down, but the caterpillars tend to stay on the same pine for the whole season. That is why it is important to treat all the infested pines in an area.
Can the soil be treated after the caterpillars have buried themselves?
Yes. In areas where the caterpillars have already come down to the ground (March–May), we can treat the soil to eliminate the chrysalises before they emerge as moths.
Conclusion: prevention is always the best option
The pine processionary will not go away on its own. If you have pine trees in your garden, estate or residential development in Málaga, the smartest thing to do is act before the white nests appear. Endotherapy applied between October and December will save you problems throughout the following year.
And if you can already see the white silk bags hanging from the branches, don’t wait until May: the sooner you act, the fewer stinging hairs will be spread and the easier the pest will be to control.
At RapiPlaga we are experts in pest control in Málaga and on the Costa del Sol. We assess your situation, give you no-obligation advice and apply the most suitable treatment to protect your family and your pets.
Call us on +34 951 25 00 52 or message us on WhatsApp. We are at your service 365 days a year.
