u/Historical-Ad-4720

Found a few feet apart from each other in the middle of washed up debris. Any insights would be very helpful! Thanks in advance :))

I'm vegetable garden sitting for a friend and after tending it for about a week I stumbled upon the dreadful sight of infected squash leaves, that I believe to be powdery mildew. It literally happened overnight, as the plants seemed healthy yesterday.

I live in the northeastern part of the US. We got a hot spell recently then 2 consecutive days of rain. I understand that the garden is overcrowded but I tried to keep it as it is, since that's how my friend left it.
I've dealt with mildew before, but normally after bringing home infected succulents/houseplants from nurseries, but NOT ANYTHING OF THAT MAGNITUDE.

I am devastated and don't know what to tell my friend, who won't return from her until the 13th. It is not my garden and I am hesitant about treating it without my friend's consent. Please any advice is greatly appreciated.

All I have available at home is neem oil and sulfur powder.
Thank you so much in advance!

** pics 5&6 are from before the mildew spread

Edit: 2 consecutive days of rain, not snow

Hi all do you think it’s possible to nurse these back to health?

Quick backstory: I purchased these little guys together at a plant nursery. I originally thought the reason the subdenudata on the left is purple because of sun stress but that might not be the case after I did some digging - no pun intended - that pointed towards severe sunburn.

I repotted it and waited for it to adjust to the new environment for like a week and soaked it wet. They were both bone dry when I bought them. I’m scared of further deteriorating the already damaged one and I’m keeping it on my windowsill, where it gets sunlight for a good chunk of the day.

Is it beyond recovery? I care too much about all me plant friends and don’t want to give them up without swinging. Cheers in advance