What to spray on this coconut?

[Mauna Kea Cloudforest]

I live in the redwood belt on Mauna Kea and even though it's USDA zone 11b/12a and coconuts can grow, they look horrible because of this native Hawaiian leaf roller that just feasts on the fronds. It rarely gets above 75F here which is great for our coast redwood forest but the coconuts cannot grow fast enough to outgrow this miserable pest. What can I spray on this Malaysian dwarf coconut to keep it from getting decimated? I don't plant coconuts since they're planted at nauseum all over town as people seem to have little imagination to plant any of the other 3000 species of palms that can grow here. But I am willing to do a little work to keep this one looking healthy because it's a Malay dwarf. Any treatment recommendations would be much appreciated. I am ok with a synthetic chemical approach but if it stops aborting nuts as a result of not getting attacked by this pest I would want to switch to organic.

 

[Mr. Coconut Palm]

I grow everything ALL ORGANICALLY, and thus have very few pest problems, but when I do, I use Garden Safe Insecticidal Soap For Organic Gardening.  It takes care of any pest problems that I ever have.

John

[Kim]

If it is the caterpillars doing the damage, I'd go with Bt = bacillus thuringiensis.

[Mauna Kea Cloudforest]

52 minutes ago, Kim said:

If it is the caterpillars doing the damage, I'd go with Bt = bacillus thuringiensis.

It's Hedylepta blackburni, here's the info from the University, they offer zero treatment solutions claiming it's not a problem but it is a problem and it also gets my pritchardia but to a much lesser extent. http://www.extento.hawaii.edu/kbase/crop/Type/hedylept.htm

[Kim]

You could use the Bt or Bayer systemic insecticide. Those both kill caterpillars.

Something was chewing on my Ptychococcus paradoxus, but they were so tall, I couldn't tell what it was. Used the Bayer twice and it seemed to clear it up. Sometimes you just have to take a stab at it.