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Limonene for spider mites.

Phychotron

Member
Was battling some spider mites recently and went to get some sort of organic/late flower spray to slow them down before they took over entirely. 2 plants were webbing over on the to colas and there were eggs showing on plants across the room.

Basically I was looking at the sprays and they were saying the best stuff is the natural oils that kill directly with contact/consumption, not as a poison acting on the nervous system. I saw a lot of emulsions of essential oils like rosemary, peppermint, citronella, etc and one called Orange Guard, basically an emulsion of 5.9% Limonene in water. I happened to have all those in my cupboard for making salves and decided to make my own mixture up.

Limonene is a terpene that is found naturally in a lot of strains of Cannabis, but not all (The Grapegod I tested was 0%) which is why I was the most interested in it. I originally got it as a potential bong cleaner, but realized it might have potential flavoring lower grade bud somehow, but never really explored it. I've also learned about LHO--Limonene Hash Oil using buds that are frozen with liquid nitrogen.

So to emulsify the Limonene in water I used a little bit of vegetable wax emulsifier and a bit of potassium silicate. Sprayed the plants down pretty good and the majority of the mites were gone, with only one visible web on the cola that was in the very back where we couldn't spray it entirely.

Most of the plants took it very well, with a little bit of burning on a few spots but not anything very serious. The plants got harvested about a week later and seem to smoke fine. I forgot to wash them later that day, and we did spray at lights on because my partner didn't want to spray before he went to work when the lights turned out.

At that time I also sprayed down about 40 month old clones with the same spray, then dipped in a Neem oil bath and most of them took it fine. Maybe three or four had some die-back on the leaf, but most took it really well. The next week I hit them again with less emulsifier but forgot to rinse them afterward. About half are showing some sort of burn/die back since then.

What I was wondering is if anyone else has used Limonene effectively, or know a good plant-friendly emulsifier.
 

Mikell

Dipshit Know-Nothing
ICMag Donor
Veteran
Interesting.

Did you note any damage to trichomes? Physical or solvent? You mixed at 5.9%? Have you tried apply emulsifying wax and potassium silicate alone (as a control)? What is your water quality like? How much was the limonene?

I just bought a litre of polysorbate 80 to play around with. As a control (5-10ml/L) no burn at lights out. I'll play around with emulsification when I have some more time. To date, I've seen little to suggest it is anything but highly biodegradeable.

As the soap industry would have me understand, polysorbate 80 is primarily used to emulsify large amounts of heavy oil (raw oils re: neem), while polysorbate 20 is prefered for lighter oils in small concentration (essential oils re: peppermint).

Interesting factoid from Cooks Illustrated (the only cooking mag worth buying). They created a highly stable oil-vinegar emulsification using a small measure of mollasses as a stabilizer. The Maillard reaction (browning of foodstuffs as a result of heat) produces a compound known as melanoidin, which provides unparalled stability to homemade vinagarettes.

Why?

A stable emulsion is less likely to burn as oil and water naturally separate. Their rate was a tablespoon per cup, but the proportions of oil/water are vastly greater.

Stoked to follow this along.
 

Phychotron

Member
No, didn't look at the tricomes, mostly just too sad to keep looking at mite damage. Limonene is very light feeling, not oilly at all.

I'll have some tester plants off to the side that I'll start working on to refine it. I was considering the emulsion breaking down or separating as things started evaporating. I was looking into the different polysorbates but didn't get that far into research.

I was considering using Dr Broners pure Castile soap (unscented) as an emulsifier.
 

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