Reddit reviews Bonide 811 Copper 4E Fungicide 16oz (473ML)

Fig rust is caused by spores from the fungus + humidity. It's only on the underside of the leaves that the spores are made when the fungus is further along it's life cycle. If you spray copper it kills the current fungus and prevents the existing spores from causing more rust for a while on whatever you've sprayed. Dispose of any fallen leaves (don't compost them because they are a source of more spores)

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this is a good thread about fig leaf rust

copper concentrate for spray

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edit: wanted to give you a better reference link for fig rust and what to do etc

I think you have early blight.

It is a fungus.

You should remove all of the diseased leaves and stems and give it a good dose of fungicide.

Once this stuff gets going, there usually isn't anything you can do about it except weep for your unborn tomatoes. But, you might be able to slow it.

Dispose of the infected plant material in your trash, not in your compost.

I actually use both. Neem oil I combine with dish soap and water and use as a preventative spray. I mist my plants maybe once every 2 weeks. Copper fungicide I use if the problem is getting out of control in tandem with neem. Copper once a week. I dont have any issues since I grow indoor but my tomatoes get fungus infections every year after a wet period followed by a really warm one
I linked the concentrate which you dilute in water. They have a ready to use version also from the same company. Just more $ for less.
Bonide 811 Copper 4E Fungicide 16oz (473ML) https://www.amazon.com/dp/B00BSULSHA/ref=cm_sw_r_cp_apa_i_uycqDb7DVNPP8

General Advice:

• Use a concentrate for bug/fungus sprays! Don't waste money on the ready-to-spray crap.
  
• When spraying for bugs, always use a fungicide in low-concentrate as well. The reason is that the water will encourage fungus growth, so you need to counteract that.
  
• Start with lower-concentrates, and work your way up. It's generally better to under-do something, than over-do and burn your plants.
  
  Fertilizer:
  
  
• General Hydroponics MaxiGro plus MaxiBloom (6/5) - I've tried all sorts of fertilizers, and found this to be the cheapest, most effective for container plants. To give you an idea how effective, this plant was growing in a 10oz solo cup at the time of that photo. The small quantity goes a LONG way; I've found it MUCH cheaper and easier to balance versus buying bags and bags of other fertilizers (i.e. bone-meal, compost, iron, calcium, etc, fish/kelp based, etc). Mix 1 tsp per gallon. I'm lazy, so I do 1tsp of each in a 2-gallon bucket, then distribute to all of my plants.
  
• Silica (4/5) - I can't report anything 'scientific' but according to my research, silica helps plants grow much stronger. I also mix this with my watering solution at about 1tsp per 2 gallons, but you can go a bit stronger if you like. Only reason it's 4/5 is because my plants were doing great before using this, so it's hard to tell exactly how much of a difference it's actually made.
  
• Tomato-tone (5/5) - Inexpensive, diverse nutrients, VERY effective. This stuff revived several container tomatoes, and a 4-foot basil plant. Smells a little, but not too bad.
  
• Earthworm Castings (5/5) - Inexpensive, diverse nutrients. This stuff can be used fairly liberally, and is an 'organic' option. Definitely helped keep my plants happy and healthy.
  
• Pearlite/Vermiculite (4/5) - Not a fertilizer, but helps prevent soil compaction, root-rot, and over-watering issues. This stuff is cheap, especially in larger quantities. Use liberally! It's difficult to over-use.
  
• Water Absorbing Crystals (4/5) - Inexpensive, fun, aerates soil, stores water, and kinda crazy (fun for kids)! These 'crystals' absorb water expanding many times their size, and then release that water. As you might imagine, this expansion and contraction keeps the soil loose, prevents over-watering, and is also good for "plants no one waters" scenarios. My only hesitation is it's somewhat of a 'chemical' additive, but all of my research suggests it's safe.
  
  Bugs:
  
  
• Spinosad plus Permethrin (5/5) - Concentrate lasts forever, very effective, human/pet safe, good for edible plants, pleasant/minimal smell, minimal/no mess.
  
• Diatomaceous Earth (4/5) - Effective, must be applied liberally, though it can be a bit messy, and may need re-application.
  
• Safer Soap (3/5) - Somewhat effective, but for edible plants, the taste is hard to get out, and made a mess of my grow tent. On the good side, it's cheap and lasts forever.
  
• Neem Oil (2/5) - Smells terrible, don't use indoors. Perhaps good for outdoor use?
  
  Fungus:
  
  
• Chlorothalonil (?/5) - After extensive research, apparently this is safer and more effective than copper. Trying this product next.
  
• Copper (4/5) - Has effectively reduced a very bad leaf-fungus issue I was having on tomatoes and peppers. Only issues are that according to my research, it's not the safest product, and works best as a preventative rather than 'cure.'
  
• Hydrogen Peroxide (4/5) - Use 30%-35% food-grade, and dilute heavily to about 1-2%. Good for root-rot, algae, and leaf-mold (spray). Leaves no mess, as it breaks down into water+oxygen. Safe for plants and humans (in low concentrations). Only problem is that it's a short-term solution.
  
• Baking Soda (2/5) - I may have misapplied it, but this seemed to burn my plants.
  
  
  
  

I use bleach and H202 as well depending on the use case. I use copper for when I'm spraying soils and keep the others for hydroponic use normally. No specific reason except that the copper stuff is just amazing. I've tried using bleach and water mixed on soil to manage fungus and its okay but a shot with the copper spray and most things just dissolve immediately.

This is what I use but the price on amazon is kinda... ouch, lol.

If you decide to try some it is probably more economical if buying online to shop elsewhere or get the concentrate and mix yourself.