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Treatment Plans: Prevention and Eradication

Many people mistakenly think treatment for RPW (both for prevention and infestation) is expensive and without guarantees – but, the truth is that trees CAN be kept clear of the weevil for as little as €20 per month and, when Naturjardins has agreed to take on an infested tree, we give customers a money-back guarantee. If we fail to save the tree, a proportion of costs are refunded.

To date, we have not failed on one guarantee …


Treating the crown of an infested Canary Palm Naturjardins uses both biological nematodes (introducing up to 50,000 million per tree), following on a week later with chemicals (as above) and then re-treating the tree after a three-week period.
Within a short period of time results are soon forthcoming – with new shoots spelling the beginning of the tree’s recovery.  Prevention treatment is very simple, quick and innocuous to people and animals. The key is consistency.  Prevention must be undergone regularly (once a month) to be effective, and needs to be administered directly into the centre of the tree (usually involving ladders and specially-adapted hose attachments).

 Weevils are wily and seem to find ways round the chemicals used against them – that’s why it’s best to use a cocktail of various products, in varying quantities, and another reason why the job is best left to professionals (incorrectly administered chemicals could actually harm the tree and / or be ineffective in repelling any infestation.

 Right now, the most commonly used chemicals are Confidor, Soleol and Actara - although this will undoubtedly change over time. New products are constantly being introduced onto the market – and palm professionals are regularly updated by suppliers and manufacturers as “getting it right” has come to mean big business.

Treatment for infestation

This is less simple and quick, but still innocuous to people and animals. The key here is always timing. If you get to the tree in time, it can be saved… if infestation has already burrowed deep into the crown, the chances are less likely.

 The first thing to do is “tree surgery”: digging down into the affected area and removing as much dead material, larvae and bugs as possible. Then it’s time to introduce nematodes (microscopic organisms that eat RPW larvae. Nematodes are introduced diluted in water, and the quantity is very important. Naturjardins has upped dosage these days to 50 million per tree. It sounds a lot, but it brings results… any lower and we’ve found results diminish).

Nematodes on their own, however, are not the answer. Being living creatures, they are totally safe and “biological” – but they have a very short life span.

We’ve found that the best form of treatment for infestation involves introducing nematodes, followed a week later by chemicals. This treatment is then repeated within three weeks – at which point the telltale new shoots signalling recovery are usually visible.