Frigaultanswered grow question 4 years ago Look like something took shits everywher while sipping at the plant... Lol.. i really dont know many anwers can only be aprouved thru lab testing.. this looks like crystalized salt grains maybe you drop so nutes and it cause a burn. A rwally don't know. Especially if uts isolated. If it dosentbsoread then no worries.. if it spread i'd remove the leaf. But what is necrosed will remain like this. But really har to tell with these photo and a cellphone to look at it. Maybe someone has experience this before.. haven't dealt with virus or bacteria that cause these