Seeds: AK-47, Autoflower, purchased from ILGM in Nov 2017 (Tasmania)
Situation: Sprouted/Germinated seeds(seed starter mix) as per ILGM directions under 2 x 18 W Grolux fluorescent tubes.
One of two seeds germinated. Tomorrow(Wed) is week three. Approx 3-4 days ago I cut off and discarded the first set of true leaves, after a yellow spot on each leaf developed into pustules that grew into irregular patterns and spread throughout each leaf ending with the leaf becoming brittle, then dry and cracking. At that point I researched and have determined it is leaf septoria fungus. HORROR… already other new leaf growth has/is developing minute golden yellow spots on a otherwise healthy plant. I have treated the plant with a copper based fungicide and I am dubbing the yellow spots with Sesame oil. Research suggests sesame oil “kills septoria fungus” BUT other research says once an infection has taken hold, all one can do is treat the infection. Sigh…
We had a cold period here in Tassie post germination( 7-15 deg C for 7 days) I left the germinating heat pad on help keep the seedling warm, I may have contributed to this issue.
Is it worth persevering with this plant? OR am I putting my other plants in danger of catching this fungus?
I grow outdoors and am worried the spores will spread. I have clones arriving in two weeks and am very worried. But, I am interested in trying to save my first AK-47 and get past this fungus problem. If you do not try…
Can septoria be carried in a plant’s genetics? OR does it develop when/if given the perfect conditions? I grow Snapdragons(Nemesia strumosa) which are very susceptible to their own version of leaf rust(Antirrhinum rust) so I am very familiar with spotting the tiny golden yellow colored fungus spots on plant leaves. At first sight I thought I may have transferred the Antirrhinum rust onto the AK-47, but research suggests each plant species has its own unique leaf septoria fungus.
In your experience with leaf septoria, outdoors, what is the best plan of attack?
I look forward to a/your reply,