I have found that the spray bottle used by the SNS pesticides from Sierra natural science to be excellent. You get nice smelling anti-fungals and spider mite stuff for your IPM.
Looks like they have a collapsible sprayer for $5 there too. I’ve not tried it yet.
Got this for about $10 at Lowes. Works great. I actually have 3. The previous version had a brass nozzle, but the plastic one is also adjustable and works fine.
I highly recommend this one, it’s super small but it creates a really nice fine mist and the adjustable spray head makes it easy to get underneath the leaves with sprays. Angle the nozzle upwards and sweep it from the bottom of the plant upwards, coats everything real nice. As I said it’s pretty small so if youre spraying double digit numbers of plants this is probably not helpful, but for a little 6 plant garden it’s perfect, I actually end up having too much pretty often.
I use worm casting & bat guano tea with h202 in water. During Budding we chlorinate the water in foliar spray holding tank, very low percentage. 150 gals water, Two 2oz chlorine tablets.
I use a airless Greco paint sprayer . They sell a hand held for around 200 bucks I opted for a step up that has the hose to suck out of a pail rather than the small quart container type .
Works excellent for foliar and pest control used to use plastic spray bottles but this thing kicks ass not a leaf gets missed out getting sprayed .
Plus you can still paint your house or fence duel purpose purchase . Win win .
Ps check local bargain finder adds or garage sales bound to find one cheap that’s in good shape .
Done that on big farm and the cool thing with the airless is if its for pest sprays, the get gassed from above and down to ground annihilation. My buddy uses dr bronners peppermint soap, for pests and compost tea he makes for soil is toxic, but the foliar is mild.
Plants seem to like the “windy wet job”