I agree with Weezard & Str8edge--I would avoid Imid (besides, not tooo sure if Imid will actually kill the gnats).
If it were me, 30 days in flower and gnats are everywhere--here is what I would:
1. Top dress each container 15ml of Mosquito Bits (7.5ml if container is less than 1 gallon size) and mix up the top 1/2" of soil (this will piss of the gnats) spreading out the bits evenly.
2. Water to activate the BTi in Mosquito Bits...and spray the soil surface with my Soil Pest Spray. But be careful of the overspray, as it will turn it white.
3. Place a yellow sticky card on each container--to identify the few fussy pussy plants that are your "gnat production farms". These I would treat with bigger guns--or cull.
Soil Pest Spray
1. Half-fill a 32ox Canning Jar with water.
2. Add 7.5ml Riptide (or appropriate amount of pyrethrin based insecticide).
3. Add 7.5ml Neem Oil.
4. Add 60ml Fossil Shell Flour (or powdered Diatomaceous Earth).
5. Seal with lid and shake for 30 seconds (think martini)
6. Fill Canning Jar with water (for 32 oz), seal and shake again.
7. Immediately pour into a spray bottle...funnel makes the job easier. I like the chemical quality spray bottles at Home Depot--they don't clog at all and less than $5 for 32 oz bottle.
8. Keep the solution suspended by shaking the bottle constantly.
The rationale behind the routine (with more than four modes of action):
1. The bacillus thuringiensis israelensis in the Mosquito Bits is most effective against Gnats with they are in young first instar larvae stage.
2. Pyrethrin in Riptide is a contact killer and will kill the more mature gnats--but not the larvae.
3. Neem Oil is also a contact killer but has a different mode of action than pyrethrins--and can kill the larvae.
4. Diatoms are a great slicers and dicers for crawling critters and they also are great absorbers (110%)--as they will hold some of pyrethrin and neem oil and release it later as the diatoms dry out and return to their powder like form.
5. Safe for plants in flower (just watch your overspray).
Good luck!
If it were me, 30 days in flower and gnats are everywhere--here is what I would:
1. Top dress each container 15ml of Mosquito Bits (7.5ml if container is less than 1 gallon size) and mix up the top 1/2" of soil (this will piss of the gnats) spreading out the bits evenly.
2. Water to activate the BTi in Mosquito Bits...and spray the soil surface with my Soil Pest Spray. But be careful of the overspray, as it will turn it white.
3. Place a yellow sticky card on each container--to identify the few fussy pussy plants that are your "gnat production farms". These I would treat with bigger guns--or cull.
Soil Pest Spray
1. Half-fill a 32ox Canning Jar with water.
2. Add 7.5ml Riptide (or appropriate amount of pyrethrin based insecticide).
3. Add 7.5ml Neem Oil.
4. Add 60ml Fossil Shell Flour (or powdered Diatomaceous Earth).
5. Seal with lid and shake for 30 seconds (think martini)
6. Fill Canning Jar with water (for 32 oz), seal and shake again.
7. Immediately pour into a spray bottle...funnel makes the job easier. I like the chemical quality spray bottles at Home Depot--they don't clog at all and less than $5 for 32 oz bottle.
8. Keep the solution suspended by shaking the bottle constantly.
The rationale behind the routine (with more than four modes of action):
1. The bacillus thuringiensis israelensis in the Mosquito Bits is most effective against Gnats with they are in young first instar larvae stage.
2. Pyrethrin in Riptide is a contact killer and will kill the more mature gnats--but not the larvae.
3. Neem Oil is also a contact killer but has a different mode of action than pyrethrins--and can kill the larvae.
4. Diatoms are a great slicers and dicers for crawling critters and they also are great absorbers (110%)--as they will hold some of pyrethrin and neem oil and release it later as the diatoms dry out and return to their powder like form.
5. Safe for plants in flower (just watch your overspray).
Good luck!
