@ Tony,
All are about the same other than the worst effected, which is the N. trubcata x ventricosa. On this particular plant the spots ‘appear’ to have increased in size very slightly and the plant tissue in the middle of the larger spots is starting to die off. So overall whatever this pathogen is it is not fast moving at this point.
Although I would have liked to try treating this the week I rased it here, unfortunately I'm not having much luck getting one of the preferred fungicides right now. Add to this the multitude of varying recommendations I’m getting from different people (very confusing) and the issues with avavilability here ins Aus. and I am still no closer to finding what I want.
I did try some of the Fongarid on the N. tuncata x ventricosa and the small N. sanguinea simply because I had it. But as already noted, I am an not expecting it to do much.
@ Christian,
Now, you see this is where I’m getting confused. My take was that the general consensus was to try a
systemic fungicide that contained
thiophanate-methyl, given it’s broad spectrum ability and, in the majority of cases, little/no side effects on Neps.
You’ve thrown in yet another – “Mancozeb” which has a different main ingredient. From what I can see it is recommended for use with “ornamentals” (as most of the other recommended fungicides) so I’m assuming it’s safe? I can’t remember if you mentioned it on the weekend but have you actually used it with any success and specifically what did you try to treat with it?
By the way, the active ingredient (or one of) in Cleary’s 336 (and Topsin and Zyban) is thiophanate-methyl. I can’t find any reference to any of them having this
Dithiocarbamate that is in the mancozeb.
I’ve also not been able find any comment about Mancozeb being systemic. Though I did find an interesting reference on fungicide uptake stating that most that are claimed to be systemic actually are not and they should be termed ‘penetrates’:
[b said:
Quote[/b] ] Another contradiction centres on the use of the word systemic. A systemic chemical by definition is capable of moving throughout a plant from leaves to stems to roots or vice versa. In fact, the only truly systemic turf fungicide is fosetyl aluminum (Aliette Signature®). Most other so-called systemics are better referred to as penetrants, because they either remain localised inside tissue or primarily move upward in the xylem in response to the transpiration stream.
Fungicides: Plant Uptake and Mode of Action
What I have found is that Zyban also has Mancozeb in it. So at this stage Zyban is still at the top of my list having both the mancozeb and thiophanate-methyl.
I did have Banrot as my #2 due to having thiophnate-methyl (and etridiazole). But… what I find odd is that Zyban is recommended for a range of leaf related pathogens where as Banrot for root and soil related pathogens
Why would that be given they both have thiophanate-methyl as the main ingredient?
Man! My head is spinning…
Aaron.