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- fine-ass '22 harvest!
That's it Hab's! Cold tempsreally slow the uptake and metabolism of P and several other nute elements,..might see Fe defc. kick in too,... but those necrotic patches are spot on... another thing-and I'm not 100% sure on this-- is something associated with rapid drafty cooling called mesophyll cell collapse (inner layers of leaf cells, where all the photosynthetic "machinery" is located)... presents with sunken, wet looking interveinal patches like those above,... I've seen it on some orchid genera too, only with their very thick leaves (Laelia's, Cattleya's) it's glaringly obvious! ... nowt to be done mate but get those temp's up ASAP,... I'd reboost the soil herd too.... 

--that's you on the left ay? 