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Questions and answers in a live by the group of the face BR Fanaticos by Parreiras with the teacher Sergio Semerdjian
There is a beetle called Rhynchophorus palmarum, which attacks Arecaceaes by depositing eggs into incisions at the base of the rachis.
When they hatch, the larvae make galleries in the tissues of the plants, mainly in the apical bud, the petiole of the new leaves and the soft stipe.
This beetle is a vector of a nematode (Rhadinaphelenchus cocophilus), which causes a disease called the malachite ring. The symptom of this disease is the continuous yellowing of the leaves.
If the coconut tree does not have the red ring ("its presence can be technically identified by making a transverse cut in part of the coconut stem: the disease is announced by the existence of a red ring around the perimeter of the cut" ) you can inject a solution of malathion 50 E (80 ml / 10 l. water) or Parathion 60 E (50 ml / 100 l water) into the holes to try to kill the beetle.
As biological control, it is necessary to install baits of pheromones, which are vegetable baits contaminated with spores of the fungus Beauveria bassiana.
After immersion in the spore suspension of the fungus, the baits are conditioned in self-contamination traps, consisting of plastic buckets containing the pest pheromone and with lateral holes that allow the entrance and exit of the beetles. These containers are distributed at strategic points outside the planting and preferably under shrubs.
As an additional control, spray the plants with copper-based fungicides and organophosphorus insecticides.
If the plant already has the red ring, unfortunately the only solution is to eliminate diseased plants and plant others in place.
Spraying salt water from time to time is to kill the larvae of beetles (which may already exist in the plant) and should always be done when cutting the leaves. Sound coconut tree is that "ugly", where the leaves dry naturally, without cuts.
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