Never seen this on a leaf. Have you?

Budzbuddha said:

First i was gonna say AIDS but looks like russet / broad mites.

Almost impossible to see with eye - you can try Avid / Trifecta / etc.

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Wouldn't my other plants be displaying this issue if it was mites?

VincenzioVonHook said:

Just on the off chance, Is there a need for 500w in a 3x3? That's pretty insane.

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They're small cheap lights. Rated at 500 but I doubt they're getting that full power. They've worked great together over the years for veg

bam0813 said:

Why would a plant in soil thats RICH in iron have an iron deficiency? Iron is a micro nute . Your plant already needs almost none in comparison. Why supplement iron ……quickly

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The soil in Hawaii is rich in Iron according to Google. I'm using roots bag soil.

bam0813 said:

Pest check?

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I dont see anything. I've had pests in the past, particularly outdoors.

Have you had mites? Not saying it is but you probably won’t see them with naked eye easily

Like budzbuddha said it looks broad mites. Just something to check

bam0813 said:

Have you had mites? Not saying it is but you probably won’t see them with naked eye easily

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I've had spider mites before. I know to notice those by the white specs on leaves (leaf discoloration) and webbing in later stages. That's the only kind of mite I've had and I used habanero spray to take care of them. I'll hit them with some habanero incase it is. I just can't see it being mites and the other 3 plants looking healthy.

dankydank1973 said:

I've had spider mites before. I know to notice those by the white specs on leaves (leaf discoloration) and webbing in later stages. That's the only kind of mite I've had and I used habanero spray to take care of them. I'll hit them with some habanero incase it is. I just can't see it being mites and the other 3 plants looking healthy.

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They are nearly impossible to see due to their tiny size ….. they lay eggs inside of plant and are extremely hard to get rid of.
With broad mites or russet mites, the new growth may be twisted, blistered and "wet" looking. If your plant is flowering the buds may turn brown and die. If you are planning to “ treat “ …. Treat everything. Read the labels of products - make sure it states broad or russet mites. Standard mite sprays will not work .

Also be open to trashing any and all infected plants - as you may not be able to control it. Once infestations spread up your plants, it is almost impossible to save these plants. Don’t hesitate to discard entire plants, even if they are not entirely affected. While you are treating affected plants, the mites are hurriedly spreading to others. Prevent spreading mites. Discard infested plants in plastic bags and dispose of them in sealed garbage containers. Some growers have to resort to sterilizing their soils too - steam or heat.

Repeat treatments weekly for 5 more weeks AFTER your mites are gone – AFTER you think broad or Hemp Russet mites are completely gone, don't stop! This is why it may be a losing battle ….

Either way - you will have to do a full cleanup ( bleach / water ) of grow area.