I have a cut that looks different from all the others. If I photographed it closely, do any of you folks think you might be able to tell if there's something up with it?
Also, I've been scanning many of the posts, so forgive me if I've missed it--has anyone had duds outside, under the sun? My root aphid plants never did well, but they did make trichomes and smoke fairly ok, they just never really produced due to all that stress, and subsequent cuttings never rooted so I lost all those ladies.
I have been doing some reading. If it is Fusarium, it's worse than I thought!
Fusarium is passed through seed! That means seeds are not safe anymore!
"If seed is taken from infected plants, the seed itself is usually healthy, but the seed coat often becomes contaminated by microscopic pieces of infected tissue and by spores. Many important Fusarium wilt diseases are spread in this manner. It is always prudent to treat seed with a fungicide or heat to destroy the fungus on the seed and to protect the emerging seedlings from infection."
http://www.ipm.ucdavis.edu/PMG/r280100811.html
"Fungicides are not effective to control this soil borne pathogen."
http://ipm.ifas.ufl.edu/resources/success_stories/T&PGuide/pdfs/Chapter5/Fusarium.pdf
I also read that this fungi easily goes airborne! I'll find the link later.
Now we know it's passed through seed and that fungicides don't work and that it's airborne. (
Eagle 20 is no longer a magic bullet) It just makes the work Im doing that much more important. It's going to take a great deal of work to preserve and restore these OG's, but I'll get it done.
But the seeds can be sterilized using H2O2, rubbing alcohol, bleach, or hell, maybe even milk could work, right? I mean, if I'm reading this right then it's not like viruses that are actually embedded in the embryo, it's on the seed coat/hull/husk, and that implies to me that it might be killed.
The fungus produces two kinds of spores. Chlamydospores are resistant to drying and adverse conditions, and enable the fungus to survive extended periods in soil. Conidia are produced in a sporodochium, which is a mass of conidiophores (conidia-bearing stalks) placed tightly together. Sporodochia are sometimes visible as small, pink-to-orange cushions on dead tissue as well as along hyphae. Conidia are spread by splashing water and can contaminate tools and hands. There are two types of conidia: macroconidia (large, multi-celled spores) and microconidia (small, one-celled spores). Conidia generally are not airborne, but the fungus can become airborne in bits of infected plant debris, in dust, or in splashing water.
This is the same kind of vector control necessary to prevent spread of Septoria. You do have to change how you do things, I found the easiest was to use saucers or any other kind of water-holding container to set the plants in, then water
that. Of course, I'm not sure how that could be addressed in other systems, like DWC or hydro, or UC buckets.
Fusarium wilts are favored by high air and soil temperatures (75° to 86°F) and disease may not occur at low soil temperatures (below 68°F). An infected plant may remain symptomless at lower temperatures. The fungus can be spread through the use of infected cuttings or other forms of vegetative propagation taken from healthy appearing but infected plants.
Again, it looks like this is more easily controlled in some scenarios than others.
Liming soils and using nitrate nitrogen fertilizer have been effective for management of Fusarium oxysporum on chrysanthemum, aster, gladiolus, cucumber, tomato, and watermelon.
?? pH and NO3 management, hints at management/husbandry practices, no?
(
Eagle 20 is no longer a magic bullet)
E20 was
never a magic bullet. A few years ago I started a thread on the issue of resistance due to E20.
