4 infos publiées
A/ The council in Beaulieu- sur- Mer has taken action to prevent the spread of weevils otherwise known as the ‘palm killers’ which are attacking the trees which are an important part of the local landscape. The red-palm weevil had previously attacked the ‘Phoenix’ palm tree and is now attacking the ‘Washingtonia’. The prevention process is expensive and the council hopes that any private properties with Palm trees will follow suit in order to stop the possible spread of the disease.
B/ The development of part of these pests’ cycle inside palm trees puts their stability at risk, a circumstance accentuated in date palms and Washingtonia sp. In light of the potential growth of affected specimens in Phoenix canariensis and the appearance of diseased specimens in other species, these measures are applicable for all date palms in Palma
A new chalconoid analogue, named filiferol, was isolated from the palm Washingtonia filifera.
Larvicidal activity of filiferol has been observed against Red Palm Weevil, Rhynchophorus ferrugineus.
Filiferol is undetectable in palm species susceptible to the parasite.
Filiferol seems to be involved in the resistance of W. filifera to the Red Palm Weevil attack.
A chalconoid analogue, 1,3,5-benzentriol 2-[(2S,3R)-3-(3,4-dihydroxylphenyl)-2,3-dihydroxylpropyl], named filiferol (1), has been isolated and purified for the first time from the leaf basal tissues of the palm species Washingtonia filifera. The chemical structure of the isolated compound has been elucidated unambiguously by spectroscopic and chemical methods. Filiferol has been based on a flavonol structure with the reduction of the common flavonoid keto group to give an unprecedented methylene carbon on the three carbon chain. An analogous compound with S stereochemistry at C3 has been obtained as synthetic intermediate for developing an enantioselective synthesis of (2R,3S)-(+)-catechin.
Even though 1 proved to be deprived of antifungal properties, it displays a very effective larvicidal activity against Red Palm Weevil, Rhynchophorus ferrugineus, an important pest affecting cultivated and ornamental palms. 1 has been isolated from leaf tissues of W. filifera, a species resistant to this pest, but this molecule seems instead undetectable in tissues of other palm species susceptible to the parasite. The presence of 1 could therefore account for W. filifera natural resistance to the attacks of the Red Palm Weevil (R. ferrugineus).
D/ Dans portofolio infestation découverte mi-novembre région d’Hyéres.
Nous sommes terrifiés de constater que la quasi-totalité des mairies, ne fait pas de prévention, qu’elles veulent pourtant imposer à leurs habitants. Elles se contentent aux frais des contribuables, pour les plus vertueuses de tenter des opérations d’assainissement, pour les moins de faire de l’abattage de masse et des remplacements par des Washingtonia sans se poser la question de leur pérennité.
La recherche française et européenne en dehors semble-t-il des Italiens, n’a fait aucun effort pour sélectionner des variétés auto- résistantes aux agressions du charançon. On se demande bien à quoi ont servi les fonds européens du Palm Protect Project !