Please Need help

I'm starting to get really worried about my plants I'm noticing powdery mildew and my leaves are really starting to yellow with spots someone plz help

Potassium bicarbonate– Similar to baking soda, this has the unique advantage of actually eliminating powdery mildew once it’s there. Potassium bicarbonate is a contact fungicide which kills the powdery mildew spores quickly. In addition, it’s approved for use in organic growing.

Milk – The latest player in the fight against powdery mildew is milk. It’s not clear yet why it works so well, but it is believed that naturally occurring compounds in the milk are at work to combat the disease while also boosting the plant’s immune system. One experiment showed good results by applying a weekly dose of one part milk to two parts water.

Also ... .......... If it IS powdery mildew ... You will have to sanitize your tents or grow space
AFTER pulling plants.

I sprayed them all with the baking soda spray hoping for the best

donofkillz420 said:

I sprayed them all with the baking soda spray hoping for the best

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If there's an over abundance of white powder residue left on the leaves. Don't leave it for long. A couple of days. Rinse off excess with a sprayer and plain water. It has to do with salt build up on the leaves.

Most of the receipts calling for baking soda come from organic Rose fungus remedies. Roses catch hell from fungus. The fungicides cross over to cannabis. Sorta. It's the sodium part to be careful with.

Can someone tell me what is causing this

donofkillz420 said:

Can someone tell me what is causing this

Click to expand...

It's Septoria.

Reference,

https://tse2.mm.bing.net/th?id=OIP.nOjDm0gwUkVx-pQKgiCSpgDgEs&pid=15.1

To prevent or reduce the chance of outbreak, there are a few actions you can take:

• You must have a clean garden space with healthy soils. This is the most important preventative measure you can take. If you have an outbreak, you may need to replace your growing medium before planting again.
• Clean your entire grow room, especially if you’re operating an indoor garden.
• Use drip lines to water your plants so the leaves don’t get wet
• Space the plants further apart to help keep direct moisture off the plants and the humidity levels down

It could also be a Phosphorus Problem, they may need more Nitrogen also, Lack of Phosphorus can also leave dark blue spots and turn the veins, blotches often appear on stems.leaf and Petioles, the veins often turn Reddish-purple starting on the underneath the leaves it may not be well pronounced. and the leaf tips will curl downward, if sever enough leaves develop dark purple-black necrotic spots or Blotches and turn bronzish-purple dry and die.

Good Luck hope you get it figured out.....
https://www.leafly.com/news/cannabis-101/tips-watering-cannabis-plants-effectively

Thanks for the advice gotta say I'm pretty worried at this point I removed all the leaves with septoria but I'm also noticing a very light powdery mildew on some of the plant I've sprayed them with a baking soda spray then with water the next day but I'm still seeing it