There are only 3 kinds of growers:
Those who have Spider Mites
Those who are about to have Spider Mites
Those who lie about not having Spider Mites
This post is for the first and second type of grower. The third type is dangerous and will often use a dangerous chemical late in flower in order to sell a crop that may not be fit for consumption. Such a person should test the pesticide on themselves first, prior to selling a crop that should have been trashed.
The idea is to plan for mites and manage them so that safe, healthy crops are produced.
Mites have an amazing ability to reproduce, and can live many months in hibernation, only to wake up, eat your leaves, screw and have hundreds of thousands of babies, who grow up, screw and then have even more.
What this means is that if you use ANY product exclusively---with one exception---the handful of mites that you don't kill will produce mites that have a natural ability to survive whatever spray you were using. Do this for a few cycles and you've now got mites that pyrethrin won't touch.
Same with Avid, Floramite, Forbid, or any other miticide.
The exception is Azadathracin, which is found in Mite Rid, Azamax and Azatrol. The mites cannot build up a tolerance to this substance, because of the way it works. However, while this stuff is good for controlling an infestation, it doesn't have the knockdown power that some other stuff has.
Here's what I've learned from professional nursery folks, who need to kill mites in order to put food on their table:
Low temps and high RH slow the mites down. Hot and dry make them go crazy. If you want to save your crop, keep temps in the '70s and RH between 50 and 60. To avoid but rot and powdery mildew use Serenade or some other product if necessary.
Buy several Primary products and rotate them.
1.)Floramite
2.)Forbid
3.)Avid (or another one. Avid is nasty, but effective)
You can only spray each product ONCE per year!
Then, get several secondary products, and rotate them:
1.)Azatrol/Azamax
2.)Pyrethrin (Doctor Doom)
3.)Mite Rid (stronger version of Azadathracin that can also be systemic)
Finally, get some bug bombs and Hot Shot strips.
So, here's how to use the products:
If you had mites on your last grow:
1.)Mop, bleach, clean, scrub the grow room.
2.)2 Bug bombs, 5 days apart.
3.)No Pest strip hung for 10 days
4.)After doing 1-3, start another crop.
5.)Before switching to 12/12 spray plants with a primary product (Floramite, Forbid, Avid)
Watch carefully for mites throughout the grow. If you find any, treat them with a secondary product from the list. These products are safe if used properly, some of them up until the day of harvest. Continue spraying the secondary products in rotation every 5 days, until no more mites can be found.
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If you were lucky enough to NOT have had mites on your last grow:
1.)Mop, bleach, scrub the grow room.
2.)Bug bomb once
3.)Hang No Pest strip for 10 days
4.)Begin the grow
5.)Just before going 12/12 spray plants with a secondary product
6.)continue to monitor for signs of mites throughout the grow and use only secondary products to manage them.
At the conclusion of the grow, start the process listed above "If you had mites on your last grow."
By doing this, you will manage the mites, produce safe and healthy product and most importantly, You will not breed supermites!
One other thing, carefully examine each and every clone before they enter your grow room. If they have mites, start the process as if you had mites on your last grow! Because, if you bring mite-infested clones into your grow room, you've now got mites.....Pray that whoever produced the clone didn't create super mites because they have a favorite product that they use over and over and over.
I'm told the mites in Humbolt area are immune to almost everything.