FUSARIUM??

[huge69]

Good morning everyone
Since a couple of weeks I have noticed first a yellowing of the leaves (which can happen and there could be various reasons), then the necrosis of a secondary branch of a plant, then I noticed that where it was attached to the main branch the stem had become brown like woodish, after a few days the same thing happened in another area of the same branch and then starting on the main stem of the plant.
Worried about it, I spoke about it to a friend who advised me to rub some bicarbonate on it which can save the plant, and so I did. Then I informed myself on the web too and, after various comparisons with various websites, it seems to me that I have the symptoms of a FUSARIUM infestation, which exploded after the great heat of the last few weeks.

Unfortunately I also read that there is no cure for this infestation but only prevention, and now that I think about it it had already happened to me in previous years, probably too much heat in the acute phase of the summer, I don't understand but from now on I will also have to think about prevention of fusarium in addition to everything else.

Has this ever happened to anyone? Has anyone ever managed to get rid of it in some ways? Otherwise I have no choice but to eliminate (or isolate it if I could) the plant hoping it has not affected the others and immediately start prevention for the others.

I'll see if I can attach some photos:

 

[huge69]

I would like to add that in addition to isolating the plant as much as possible (I have relatively little space in the outdoor growing area) I would like, as last try, to try to save it with a solution of hydrogen peroxide and water as well as a solution of water and organic fungicide based on mycorrhizal fungi (Trichoderma). Is it safe? Do you think I could apply the same precautions to other plants without harming them?

 

[Creeperpark]

You don't have fusarium friend. I'm not sure I see what you are talking about. A plant infected with fusarium will decline rapidly.

Fusarium wilt is a common fungal disease that affects plants by clogging and destroying their water-conducting tissues. It's caused by pathogenic strains of the Fusarium oxysporum pathogen, which are usually specific to a particular host. Symptoms include:

• Yellowing: Leaves on infected plants turn yellow and fall
• Wilting: The plant wilts over several days and eventually dies
• Discoloration: When cut with a sharp knife, the water-conducting tissue of the stem and roots may have a reddish-brown discoloration. Other discoloration may include orange or pink at the base of the stem
• Spore-bearing stalks: Masses of spore-bearing stalks may be visible on dead tissue and look like small pink cushions

I don't see any of the above symptoms in your plant. Take a photo of the whole plant in its container so I can get a better look at the plants' condition.

 

[xtsho]

I don't know what's wrong with your plant but something is wrong. Looks like it could be some kind of fungus.

A hydrogen peroxide spray might be in order.

 

[huge69]

You don't have fusarium friend. I'm not sure I see what you are talking about. A plant infected with fusarium will decline rapidly.

Fusarium wilt is a common fungal disease that affects plants by clogging and destroying their water-conducting tissues. It's caused by pathogenic strains of the Fusarium oxysporum pathogen, which are usually specific to a particular host. Symptoms include:

• Yellowing: Leaves on infected plants turn yellow and fall
• Wilting: The plant wilts over several days and eventually dies
• Discoloration: When cut with a sharp knife, the water-conducting tissue of the stem and roots may have a reddish-brown discoloration. Other discoloration may include orange or pink at the base of the stem
• Spore-bearing stalks: Masses of spore-bearing stalks may be visible on dead tissue and look like small pink cushions

I don't see any of the above symptoms in your plant. Take a photo of the whole plant in its container so I can get a better look at the plants' condition.

well, that would be a good news, hoping you.re right. But anyway, I attach some new pics from today, hope it may help understand, surely there is something and I must understand what because in the last two or three seasons I've experienced such problems. Yesterday I've watered with water and hydrogen peroxide as well sprayed them with it, looks a little better the main stem maybe although the branches that were starting to wither yesterday are keeping dying today. (heat over there reaches easily temps of 95F)

 

[Tynehead Tom]

Looks like the potential beginnings of Fusarium to me.
For the immediate...... mix up some baking soda and water spray and hit that shit.
I used to ge this problem here too and it sure is a plant killer.
I would do a huge defoliation to allow more airflow around the stalks.
The product I used to stop it in it's tracks was previously called Serenade but was renamed to Natria here in Canada. Only spray the affected areas. It will stop it but prevention is key.

 

[Creeperpark]

When you see a limb wilt remove it so you can watch if the plant declines fast. Don't let the hot Sun hit the containers while you are having problems. If you put a thermometer on top of the plants' soil you will see the temps can get up to 140 F or 60 C. in the hottest part of the day when the Sun hits the soil. Get a couple of bales of hay and mulch the plants and block the sun off the plant containers. I like using greenhouse black shade clothe to buffer the heat off the pots as well.

Theres a big difference between growing in the ground and growing in containers above ground when it comes to heat tolerance. Sometimes during the "heat stress" we over water trying to composite for the heat which can cause problems. Also, it's easy to underwater during periods of excess heat because the water evaporates so fast and mulch will help with that. Keep us posted.

 

[Thcvhunter]

If its fusarium, H202 wont stop it.
Grab some EM-1 from terraganix.

I notice you planted up to the first node - i recommend not doing that. It over-moistens the stem and makes the stem susceptible to molds. Ideally, keep the crown of the plant at soil level.

Look into probiotic farming.

I got hit hard with Fusarium in 2012 while following The Rev's tek and switched to probiotic farming. Never had fusarium since, and even saved a number of large scale farms by bringing in probiotics.

 

[huge69]

so, hello from italy everybody, after watering them with a solution of water and hydrogen peroxide, I left them sit and dry untill the leaves were down and soft (exagerated a little bit), today I've checked them, watered, cut a few branches that were already dried out (painfull to do it) and gave them microorganisms:

Micorrize	1%
Trichoderma harzianum	10 9 UFC/g
Trichoderma reesei	10 9 UFC/g
Trichoderma asperellum	10 9 UFC/g
Clonostachys rosea	10 9 UFC/g
Rhizosphere Bacteria	10 9 UFC/g

At the moment seems it might have stopped the process, we'll see in a couple of days. Finally I mulched all of them with organic hay that a friend gave to me, now cross fingers and we'll see. Next step another spray treatment I think. Anyway they are still yellowing and have a pale green color respect before the big heat arrived that they were beautifully green. I'm growing in soil fertilized with granular slow release fertilizer so I should not need much fertilizer but I can't understand if the fertilizer has been washed out by rain or if there is too much fertilizer (since end of may that i've put them in the actual pots they may have eaten all of it and part probably has gone with rain), anyway I think my bog problem in the last years is extreme heat in july, and this year is still very hot now! So next year I'll go back to big smart pots of 45 gallons (ideally natural color and not black if I'll find them), I've noticed it was better a few years ago with big pots, they mantain moisture better and it's more difficult they get hot in the middle.
Thanks all for the advices, I'll be happy to read suggestion from you.

 

[Probiomer]

I am having the same problem and researching solutions.
There don't seem to be too much hope.
SAR inducers are supposed to help the plants to fight it off.
I will try Chitosan, SA and harpin foliar when they arrive.

 

[Probiomer]

Looks like the potential beginnings of Fusarium to me.
For the immediate...... mix up some baking soda and water spray and hit that shit.
I used to ge this problem here too and it sure is a plant killer.
I would do a huge defoliation to allow more airflow around the stalks.
The product I used to stop it in it's tracks was previously called Serenade but was renamed to Natria here in Canada. Only spray the affected areas. It will stop it but prevention is key.

They have many products. Do you mean the Natria neem oil concentrate?

 

[eastcoastjoe]

That’s Fusarium

 

[Probiomer]

Yes unfortunately. This is how mine looks.
Lost two branches already and three more are quite limb.

 

[eastcoastjoe]

If its fusarium, H202 wont stop it.
Grab some EM-1 from terraganix.

I notice you planted up to the first node - i recommend not doing that. It over-moistens the stem and makes the stem susceptible to molds. Ideally, keep the crown of the plant at soil level.

Look into probiotic farming.

I got hit hard with Fusarium in 2012 while following The Rev's tek and switched to probiotic farming. Never had fusarium since, and even saved a number of large scale farms by bringing in probiotics.

That’s pretty interesting. What dosages of EM-1 were you using and how often ?

 

[Probiomer]

My soil has EM-1, PNSB, AMF and is full of red wigglers.
I think the only reason could be that i have very rich soil ontop of heavy clay soil. With the heavy rain this year maybe it got to moist right above the clay.

 

[Creeperpark]

Fusarium will kill a plant once infected and one can't stop it once it is infected. That's one way of knowing it's Fusarium and not another fungus without sending a sample to the lab.

Other common fungi that can hurt your marijuana plants are Botrytis cinerea, Powdery Mildew, Aspergillus, Rhizoctonia Solani, and Sclerotinia Sclerotiorum.

Aspergillus
Cannabis plants are extremely susceptible as they provide a good ecosystem to support Aspergillus because they are great sources of water, carbon matter, and sugar which aid the survival of mold. Whether your product is grown indoors or outdoors, Aspergillus can take its toll. Google

Rhizoctonia root and stem rot occurs primarily in early to mid summer. Infected plants typically appear in patches in a row or field. Several different conditions can favor this disease including, high soil moisture, warm soil temperatures, soil types with high amounts of organic matter, and delayed emergence. Google

Sclerotinia sclerotiorum symptoms
Initial symptoms of sclerotinia stem rot (and other sclerotinia diseases) appear as soft, water-soaked white to grey lesions on leaves and stems. As lesions advance they may resemble a "bull's eye" pattern of concentric rings of rotting tissue. Google

 

[Ripnvanwinkle]

well, that would be a good news, hoping you.re right. But anyway, I attach some new pics from today, hope it may help understand, surely there is something and I must understand what because in the last two or three seasons I've experienced such problems. Yesterday I've watered with water and hydrogen peroxide as well sprayed them with it, looks a little better the main stem maybe although the branches that were starting to wither yesterday are keeping dying today. (heat over there reaches easily temps of 95F) View attachment 19040513 View attachment 19040514 View attachment 19040515 View attachment 19040516 View attachment 19040517 View attachment 19040518 View attachment 19040520 View attachment 19040521 View attachment 19040522

Dude, I’ve never seen this in my life until just this year. Big plants, small pots- humidity really high at night- leak in roof- puddled water here and there… some have it and some don’t. I cloned the tops that were “ normal,( taking preventative measures with nutrition/ and responding to the things mentioned above to prevent this in the future) i’ve never seen stems bulge and split and feel soft like I have this month… just on a few but errr yeah.. big bummer. I’ve also never cut a branch to find it rotting days later vs simply hardening and callusing over.. been I’ve not had the typical things to do the things and really overlooked the value of a properly sized pot let alone the worm castings, actinovate(!!!), em-1 ( buy a jug and treat it like kombucha scoby), hps lamps and the money for electricity to run em when the sky pisses down for days, feeding small amounts of molasses regularly with teas of castings, kelp, frass.. compost..aloe..
anyway- what have you discovered since this post? Your photos are all too familiar. I hope you’ve discovered a path

 

[eastcoastjoe]

Dude, I’ve never seen this in my life until just this year. Big plants, small pots- humidity really high at night- leak in roof- puddled water here and there… some have it and some don’t. I cloned the tops that were “ normal,( taking preventative measures with nutrition/ and responding to the things mentioned above to prevent this in the future) i’ve never seen stems bulge and split and feel soft like I have this month… just on a few but errr yeah.. big bummer. I’ve also never cut a branch to find it rotting days later vs simply hardening and callusing over.. been I’ve not had the typical things to do the things and really overlooked the value of a properly sized pot let alone the worm castings, actinovate(!!!), em-1 ( buy a jug and treat it like kombucha scoby), hps lamps and the money for electricity to run em when the sky pisses down for days, feeding small amounts of molasses regularly with teas of castings, kelp, frass.. compost..aloe..
anyway- what have you discovered since this post? Your photos are all too familiar. I hope you’ve discovered a path

Those sugars your adding are fueling the fire for sure. Good thing your in containers. That spot may still be salvageable for future use

 

[Ripnvanwinkle]

Those sugars your adding are fueling the fire for sure. Good thing your in containers. That spot may still be salvageable for future use

I haven’t added molasses yet- no cash for it! These photos look like fusarium and not something else… correct? I recall woody growth over time .. these plants have been in these pots since..may 9th.. unfortunately.
Considering killing them- taking cuts off the top that don’t have that woody look.. also considering repotting them into a proper pot with biology etc.. my gut tells me I can pull it off.. either way- bummers.
Thanks for the input

 

[Grow44DE]

Having the same issue on a outdoor plant. But not on all, i noticed its just on the manicured ones.
So i guess its a virus or fungus. this pathogen needs open entry sites

@Ripnvanwinkle and i noticed that your nodes look like a hplvd infection. (img9783)