Is this pH fluctuation or some sort of deficiency?

Vdxiii

Active Member
Hi all,
Those came from the same plant. There are around 4-5 leaves with random patches like this on my Northern Lights. Wonder what could it be? I use FoxFarm trio, Vigoro soil, I usualy us pH 6.5 but recently there was rain that had 5.8 pH level. I usually foliar feed cal/mag once or twice a week. Also caught thrips and aphids and killed them all using insecticide recently. THe plant is growing tho and looks healy but leaves have been so every now and then.

Thanks for your opinions and help
 

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