pal weevil: A devastating threat
effects of Red pal weevil grow up, and by now the fight against the
plague only consists on acting after an affected plant has been located.
In the places that Red pal weevil has been found, as Elche, where has
destroyed more than 2.800 palms by now, the acting protocol consists
on an exhaustive watching, proceeding to cut the affected plants and
treating fitosanitariously the places around these plants.
Independent professionals assure there was not a way to act and complained
about the actual measures taken.
pal weevil, Rhynchophorus ferrugineus Olivier, is actually one of the
most harming insects for the palms over the world, generally causing
the death of the plant.
Being originally from the tropical regions of Asian southeast and Polynesia,
began its expansion 25 years ago attacking palms in the south of Asia,
Arabia and Iran. It was injected in the north of Africa through Egypt
by 1993 continuing its expansion to European countries like Italy, France,
Portugal and Spain. Always associated to the palms.
It is actually the most threatening plague for palms all over the world
treatments used until today are not a guarantee of their elimination
due to the difficulties it takes to put on and to discover which plants
have been affected.
The insect colonizes the plant from its crown -upper side- to the inside
part of the trunk. The death of the plant is the evidence of its infection.
About the actual quarantines in greenhouses, experts consider they are
not a guarantee, that applied treatments do not destroy the eggs, that
remain there and later are developed inside.
Procedures based on biological predators constitute an obvious risk
for activities as beekeeping and may unbalance the nourishing chains
in our ecosystems.
of an infection by Red pal weevil
In the case
of canarian palms, the damage is located basically in palms' head or
- Fallen external leafs, with obvious symptoms of being shattered at
trunks' inserting level.
- The leaf crown collapses.
- Tender leafs from central part of the plant (palmito) show a weakened
appearance and acquire a color that goes from yellow to soft red.
- Holes in the cuts of the TABALAS of the VALONA.
- Signs of PUPAS (cocoons or croquettes) between TABALAS and leafs.
- Arrows angled above the vertical.
- Twisting of the leafs in the armpit.
- Eaten leaflet.
- Eaten or chopped down raquis.
- In leafs fallen down after a pruning, and in the cut, 1 or 2 cm. galleries
produced by the larvae.
- Remainders of fibers.
In the case
of date palms, we will notice the harm usually on the base of the plant
- Red or black colored exudation and remainders of fibers that might
appear in the arq shaft of the affected specimens.
- Holes when lifting some armpits from the leafs fixed to the trunk.
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