Is it common to get broad mite eggs / infection from bagged soil?

jonnynobody

Well-Known Member
About 4 months ago I tried my first soil plant in years. I was pretty excited until I found out the plant was infested with broad mites. It then infected my other plants. I made it through 1 more harvest barely due to the ongoing broad mite battle. The problem has gotten so hopeless as of late I'm tearing everything down tomorrow and starting over in a few weeks after I bomb the room several times followed by 2x 10% bleach spray / wipe down on every surface I can touch.

I've been trying to figure out the source of the infection so I don't have it happen again and I think I've isolated it to my bag of fox farm soil. The reason I'm thinking this is the culprit is because the only plant that was infected in the beginning was the only soil plant I had in the garden. I planned to finish off the plants I had and start over from seed instead of cloning infected plants. Well those plants are now being chopped up and thrown out. I accept broad mites won this war and I hope to never battle them again.

I did end up planting 30 or so seeds starting fresh and clean. I sanitized the nursery tent 2x with 10% bleach solution and never touched the tent after I had been in my flower room on the other side of my basement. The nursery tent was basically a safe zone. No shoes over there and I only checked them in the AM so I would limit any chance of cross contamination from my infected flower room.

Low and behold just as I was feeling better about things I noticed mite damage on several seedlings. Un-fucking-believable was the only thought running through my mind. I clipped a small leaf that looked damaged and it was covered in mite eggs. Top and bottom. Hell there were probably more eggs on top than bottom. Nearly 30 new seedlings with 15+ different strains all had to be trashed. To call what happened devastating would be a big understatement.

This is what leads me to believe the soil is more than likely the source of these fucking mites. As I've watched all my plants die a slow death over the last 4 weeks I've read a lot about spider mites, particularly broad mites. Their eggs overwinter in soil and hatch when environmental conditions are right. I'm wondering if that's what happened to my plants and how common this is with other growers? Anyone else experience these kinds of issues with soil? At this point I'm not taking anymore risk using dirt. I'm using coco exclusively moving forward. Sterile and safe.

Just a last thought here - when I started growing about a decade ago I used soil exclusively for the first 4 grows. While the dope always turned out stellar I got mites every single time. Thankfully they weren't broad mites, but I still battled the little fuckers on each of those cycles. I wasn't running a perpetual garden or anything like that. All grown from seed. It seems like every time I've ever used soil I've gotten some kind of spider mite. For years growing in perlite running hempy buckets I never got mites. I had so few pest problems I didn't even run IPM. I mean none. Then I use soil and yet again I get mites. I appreciate any advice my fellow growers can share on this topic.
 

simpleleaf

Well-Known Member
I have no specific comment about broad mites and treatment for them. I use a different potting mix, and also found that I had bug problems. In the 1970s one brand of potting mix advertised itself as "steam sterilized", that product is no longer available in the same form (company was sold and product reformulated). So far as I can find, none of the potting mixes available have sterilization, organic is supposedly all the rage now. So many chemicals are sold fighting these bugs....

So, I tried different methods of heating the potting mix, and finally came up with an easy answer, I soak it in a large volume of boiling water (about 6 gallons of water for the equivalent of a bag of potting mix). I used to brew beer, so had a couple of big pots.

I can't recommend you do this with Fox Farm potting mixes. I'm certain boiling water treatment washes away nutrients from the mix. In my case, I fertilize hydroponically, so I'm okay with that.

Good luck sorting this out!
 

OG-KGP

Well-Known Member
I much prefer soilless and haven't run into any bug problems at all. Promix HP is so damn cheap too. A good dose of bene's and some sugary feed and you can reap all the benefits just feed more often.

And I know you said it yourself, a strict IPM. I cant stress that enough. People think I'm crazy because I spray everything 2x a week. Dunk cuttings every time. I treat my garden as if its has bugs but haven't seen one since i started IPM years ago.

Prevention over treatment when it comes to things that could end up costly in the end.

Good luck. Broadmites are the worst of the mites IMO.
 

waterproof808

Well-Known Member
I think it would be pretty rare for them to come in on bagged soil, considering the life span is pretty short and they are vulnerable to heat. If they somehow survived heat from composting, I'm pretty sure their lifespan is alot shorter than the time it takes soil to get bagged up and shipped and bought by the consumer. Plus they prefer to eat young leaves not detritus, so they would have no food source.

They are known to hitch rides on other bugs, like this image of broad mites on a white fly.

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jonnynobody

Well-Known Member
I think it would be pretty rare for them to come in on bagged soil, considering the life span is pretty short and they are vulnerable to heat. If they somehow survived heat from composting, I'm pretty sure their lifespan is alot shorter than the time it takes soil to get bagged up and shipped and bought by the consumer. Plus they prefer to eat young leaves not detritus, so they would have no food source.

They are known to hitch rides on other bugs, like this image of broad mites on a white fly.

View attachment 5047151
I'm not thinking live mites so much as overwintered eggs.
I agree it would be unlikely any live adults would survive composting, but a few of those dam eggs might survive depending on the compost temp. Bastards are resilient. Or even post compost contamination could be a source of mite eggs. All it takes is that piece of shit white fly covered in hitch hikers to land on that compost pile. That picture is absolutely horrifying looking. I swear these things are straight from hell.

Here's a reference on the overwintering spider mite eggs:
 
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