• Outdoor grow, Coast of Maine Stonington Blend organic soil
• 7 gallon grow bags
• well water from aquifer
Adding Ca/Mg, Grow Big, Recharge, ProTekt, one teaspoon each, once per week
I have eight plants growing. Three are dark green, bushy, and look fairly healthy. The others are lighter in color and their growth appears sort of stunted.
Some leaves have shown the yellow coloring and brown spots. I have removed and destroyed such leaves. Suspecting a fungus, I ordered neem oil and will treat all the plants. Does this seem like a rational diagnosis on my part?
It’s midnight here as I’m reading your reply. I’ll post photos tomorrow.
The seeds all came in the same batch from ILGM. They were all germinated the same, transplanted the same, all went into identical grow bags filled with the same Coast of Maine soil, and they were all watered the same.
The pictures of the damaged leaf look like something fell on it: bird poop, insect droppings etc. The general yellowing can be caused by damping off (too much water), out of PH range soil, nutrient def or other. Without any real information it’s impossible to help.
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This is definitely not something that has fallen on the leaves. Of the three healthy plants I have, two are just today showing the same sign. Here’s one that shows how it happens: a yellow patch appears on the leaf, then a dark brown spot occurs, in this case opening a hole:
All these plants were from the same batch of Granddaddy Purple seeds from ILGM. They were all germinated at the same time. (Only eight out of the ten seeds germinated.) They were transplanted into pots at the same time, then transplanted into 7 gal. grow bags at the same time. Same Coast of Maine soil, same watering, same notes, same everything.
I think this may be a fungus, probably alternaria from the photos of cannabis leaves I’ve seen that look similar. Is there anybody around who has experience with that?