can we see the pot... is it the right size.. how old is the media .. how about any info about the plant.. besides the pix ... we dont have much to go on ...

are the plants outside where are you.. what do you consider hot now...

why would you not expect watering protocol to change in summer???

does the pot drain.. do you let it near dry between waterings???

if you have many.. and much experience.. and only this one is problem... could it be that the problem is that this is the plant with the most white tissue.. and that is part of the base problem.. if so.. i might have a theory..

ken

Not enough water