Looking for opinions on how to fight Botrytis: Immunox, Captan, Regalia, Liquid Copper etc.

[sirtalis]

Hi guys,
I grow outdoors in a very humid / foggy environment and almost all of my plants have gotten Botrytis.

Currently I have 4 plants and veg and 1 in flower. The flowering plant has a new branch rotting per day, and I think it's starting to be a lost cause.

What I'm hoping for is some opinions on how to save the other 4. With them being in veg and no signs of Botrytis I figured I could start spraying some anti-fungals. I've been using Liquid Copper for now but went on shopping spree and picked up Immunox, Captan, and Regalia.

There's lots of conflicting info on the active ingredient in Immunox, but not much about Captan and Regalia. Are either of these two safe to use in flower? Should I use all 3 on the vegging plants to give them a fighting chance in flower?

Thanks.

 

[TessaMaria]

I don't know those products, I use Monterey disease control, or actinovate or 100% neem oil mixture. Lots of negative things said about spraying in flower. I think you are on the right track to prevention which is key for bud rot! Its a pain to deal with sometimes!
We have the right weather for bud rot where I live too and there are people that grow outside and have no problems with it so it can be done! Outside you don’t have the environmental control like indoors.
I have used a triple wash method at harvest for my outdoor grows and it works wonderfully! It gets all the dust, dirt, dead bugs or bug poop off and the flower dries very nicely. Good luck!

 

[xtsho]

There may be conflicting information from those trying to sell products that contain myclobutanil which is in Immunox but you should never use that stuff on cannabis. It creates toxic gasses like hydrogen cyanide when burned.

The only stuff on your list that you should use is the Regalia. It's approved for use on cannabis in Oregon, Washington, Colorado, and a couple of other states and is OMRI. I wouldn't use liquid copper or Captan on cannabis.

Another safe treatment would be potassium silicate foliar but not past a couple weeks in flower.

Use the Regalia. Save the other stuff for your landscape plants.

 

[OSBuds]

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[DCcan]

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[Observe & Report]

This is why I grow my own indoors.

 

[Ns950641]

ipm i personally keep around regalia, venegrate, grandevo, spinosad w/bt, west coast plant therapy and for code red scenarios imidaclorpid and pyrethrin most of the time if its rotting its irreversible and the best you can do is try to finish whats left of the plant. i learned early on the importance of preventatives instead of a cure. not trying to seem harsh but without knowing what type of mold/fungus it is i would chop the one in flower to prevent spread/contamination and spray the remaining plants with something like a regalia and grandevo combo as a preventative for bug, mold, and mildew

 

[sirtalis]

This is why I grow my own indoors.

To each their own. The square footage of my backyard is bigger than my apartment and I'm in a legal state. Would be a shame to not put it to use over a little botrytis issue.

 

[sirtalis]

ipm i personally keep around regalia, venegrate, grandevo, spinosad w/bt, west coast plant therapy and for code red scenarios imidaclorpid and pyrethrin most of the time if its rotting its irreversible and the best you can do is try to finish whats left of the plant. i learned early on the importance of preventatives instead of a cure. not trying to seem harsh but without knowing what type of mold/fungus it is i would chop the one in flower to prevent spread/contamination and spray the remaining plants with something like a regalia and grandevo combo as a preventative for bug, mold, and mildew

Thanks for sharing your ipm lineup. I'll look into grandevo as well.

Since I posted this thread, the only sign of botrytis on the flowering plant is one stem that is rotting from the inside out (about a 2 inch area). I'm spraying the stem every day with H202 so no spores can spread, and doing a thorough check twice a day. If it gets out of control I'll chop the whole plant but I'm taking it one day at a time right now.

 

[sirtalis]

Use the Regalia. Save the other stuff for your landscape plants.

Thanks, I think I'll go for this and leave the others for my landscape plants. Maybe I can kill off the botrytis in the off-season with the others.

 

[growslut]

get rid of your plant with botrytis. It is systemic and your methods are not preventing it, just minimizing the expression. But the entire plant is already infected. And those spores can infect the rest of your garden.

You say you've been having this problem repeatedly and I have heard a scientist say that they have tested the soil and found that the soil itself is contaminated after the plant has botrytis. (don't have the link but think it was on an espisode of Chasing Fire on YouTube). So you might want to replace your soil for next years grow.

Like others have mentioned, its best to prevent botrytis rather than treat it. So start with anti-fungals before you have any problems--basically the entire life of the plant. But be careful you aren't poisoning your plants (like someone earlier mentioned the stuff you want to try is for ornamentals--not weed). I rotate between Regalia and Southern Ag's Garden Friendly Fungicide watering them in every 7-10 days. No spray. Last year was the first year using this regimen and the first year without any bud rot. fingers crossed for this year.

Good luck

 

[Observe & Report]

To each their own. The square footage of my backyard is bigger than my apartment and I'm in a legal state. Would be a shame to not put it to use over a little botrytis issue

Don't get me wrong, I'm hugely jealous of legal outdoor growers and your trees, but if your climate isn't suited to growing Cannabis and you must resort to stepping on it then maybe you should consider climate control. It doesn't take a lot of space to grow enough for your head if you're not throwing most of it away.

 

[sirtalis]

Don't get me wrong, I'm hugely jealous of legal outdoor growers and your trees, but if your climate isn't suited to growing Cannabis and you must resort to stepping on it then maybe you should consider climate control. It doesn't take a lot of space to grow enough for your head if you're not throwing most of it away.

For sure, I'm pretty ok with growing plants that are 5x bigger than what I could fit indoors, and then losing 50% to budrot. My last harvest was about 20% lost to rot.

It's a bummer for sure but I just need to up my IPM to be more proactive rather than reactive. It seems the organic way to fight budrot is with bacteria as the active ingredient, along with growing the healthiest plants possible.

 

[Cycad]

I've had bud rot problems for many years and I suggest planting a variety of genetics and seeing which are the most resistant. Indica is likely a poor choice because the heavy, dense bud easily incubates it. You might try a sativa of a type that is suited to tropical climates such as Nigerian or Vietnamese. Once bud rot is in a plant, that's the end of it.

 

[sirtalis]

I've had bud rot problems for many years and I suggest planting a variety of genetics and seeing which are the most resistant. Indica is likely a poor choice because the heavy, dense bud easily incubates it. You might try a sativa of a type that is suited to tropical climates such as Nigerian or Vietnamese. Once bud rot is in a plant, that's the end of it.

Good call, addressing genetics at the root of the problem. I have two GSC crosses that have less dense foliage. I'll take a look back on the season and see how well they hold up.

 

[CaseyQuinn]

I just tossed half a pound cuz of Bud Rot. I'm new to this & didn't know because mine wasn't visible to the naked eye. Then when I harvested all my big Colas were eaten up in the middle. Good luck with the remedy. I'll be following this.

 

[CaseyQuinn]

I'm trying Northern Lights next. For I've read its resistant. Now that I know, all the signs were there. It was just new to me. I also invested in germ guardian units that folder the mold spores in my grow room. Cheers.

 

[sirtalis]

I'm trying Northern Lights next. For I've read its resistant. Now that I know, all the signs were there. It was just new to me. I also invested in germ guardian units that folder the mold spores in my grow room. Cheers.

It's definitely a pain in the ass. If you're indoors there's a lot more you can do to control it...dehumidifier, clean room, proper exhaust, watering right before lights on.

I'm finding from other growers there is no remedy except for prevention.

 

[CaseyQuinn]

get rid of your plant with botrytis. It is systemic and your methods are not preventing it, just minimizing the expression. But the entire plant is already infected. And those spores can infect the rest of your garden.

You say you've been having this problem repeatedly and I have heard a scientist say that they have tested the soil and found that the soil itself is contaminated after the plant has botrytis. (don't have the link but think it was on an espisode of Chasing Fire on YouTube). So you might want to replace your soil for next years grow.

Like others have mentioned, its best to prevent botrytis rather than treat it. So start with anti-fungals before you have any problems--basically the entire life of the plant. But be careful you aren't poisoning your plants (like someone earlier mentioned the stuff you want to try is for ornamentals--not weed). I rotate between Regalia and Southern Ag's Garden Friendly Fungicide watering them in every 7-10 days. No spray. Last year was the first year using this regimen and the first year without any bud rot. fingers crossed for this year.

Good luck

Thank you for the post (reply). I just bought both Regalia & Souther AG & will start using them weekly.

 

[CaseyQuinn]

It's definitely a pain in the ass. If you're indoors there's a lot more you can do to control it...dehumidifier, clean room, proper exhaust, watering right before lights on.

I'm finding from other growers there is no remedy except for prevention.

I just cleaned my whole grow room with 3 % Hydrogen peroxide & also Bleach water on other surfaces. I got some germ guardian air purifiers in route.. & I just bought some Regalia & Also Southern AG. *any suggestions on a good Humidifier? I have 2 small ones that I run both same time but it struggles to get below 50% RH around my grow tent.