Mosquito Dunks for fungus gnats--how much?

momma_s(9b, SZ14)February 3, 2010

I have 4 5 gallon buckets that are infested with fungus gnats from all the rain we've had. I've added more drainage holes on the bottom portion of all sides, and I've read other posts about using mosquito dunks soaked in water.

I've soaked 1 dunk in a gallon of water, but I haven't seen any specifics about application. Anyone know how much I should pour into each 5 gal. bucket? Thanks!

Thank you for reporting this comment. Undo

About the only direction I have found for using the Mosquito Dunks for Fungus Gnat control is to scrape about a teaspoon off a dunk and mix that in 1 gallon of water. One source stated to crumble a dunk and sprinkle the resulting "dust" on your potting soil and then stop watering for a couple of weeks, which tells me that just drying out the soil is a more effective means of control.

    Bookmark   February 4, 2010 at 7:27AM
Thank you for reporting this comment. Undo
morz8(Washington Coast Z8b)

momma, float the dunk in a container of water overnight, then use that water to water your container plants as you normally would. At least three consecutive times on your usual watering schedule, expect it to take three or four weeks to kill any hatching larvae and stop the breeding cycle.

I brought the gnats home in a new indoor plant once (I saw them around the plant in the store and didn't realize their significance) - ended up with them in every container plant, some that were decades old. I don't over water. My feeling is that keeping soil on the dry side might prevent them from establishing, it wasn't helpful in eliminating an infestation.

Years later, as I'm growing more from seed and need uniform moisture, I prefer the liquid form of BTi for convenience, but the dunks method does work.

    Bookmark   February 4, 2010 at 10:55AM
Thank you for reporting this comment. Undo

Dunks are more concentrated than Gnatrol(about double), which is reccomended to be used at 1-3 teaspoons/gal. However the dunk does not release all of its active ingredient immediately.
Crush the dunk with a hammer BEFORE opening the blister pack
Use about 1/4-1/2 dunk soaked overnight per gallon of water and you can resoak the remaining solids again, or just water them on thus allowing a constant release over time.
Thorough soaking of the media is essential, as well as controlling all nearby breeding areas such as under benches and other places organic matter accumulates.
Cleanliness and 3 weeks of follow up are very important as only the larvae, not adults, are controlled.

    Bookmark   April 14, 2010 at 6:54AM
Thank you for reporting this comment. Undo
rhizo_1 (North AL) zone 7

I agree that overly moist potting medium is not always the problem. It CAN be, but not always. Fungus gnats seem to be pretty tough, once they become established.

I still say that if you amend your potting soil so that it is not so 'peaty', fungus gnats will pack their bags and say "adios".

    Bookmark   April 14, 2010 at 9:10AM
Thank you for reporting this comment. Undo

I have a problem with fungus gnats& larve I want to get rid of them I am a novice a growing can you help please they are all over my lava rocks in my hydroponic system

    Bookmark   September 2, 2011 at 5:56PM
Thank you for reporting this comment. Undo

A new post, rather then using someone elses would have been better. However, one method to control Fungus Gnats in hydroponics is about the same as in potted plants add Gnattrol to your solution.

Here is a link that might be useful: Fungus Gnat control in Hydroponics

    Bookmark   September 4, 2011 at 7:25AM
Sign Up to comment
More Discussions
Weird white stuff growing on my plants.
I've noticed weird stuff growing & spreading on...
Cheryl Tan
Getting rid of soil nematodes
Dear veggie lovers: This is my first season growing...
Lilac Concerns
My lilac plant is... frying? ... Lives in zone 8a One...
Miscoscopic silver insect
Hi, I need help for an identification. I found them...
sudden black stains on indoor plant with insects
These black stains appeared suddenly on an indoor plant....
Sponsored Products
Sunforce Pest Control Solar Mosquito Zapper 80050
$17.72 | Home Depot
Slam Dunk Tangerine Simply Soft S-backed 17x17 Fiber Pillows (Set of 2)
Brass Accented Zinc Patio Torch with Filigree Wall Bracket - Weathered Zinc
Signature Hardware
Slam Dunk Basketball Plush Toy Chest
$109.99 | zulily
Slam Dunk Navy Simply Soft S-backed 17x17 Fiber Pillows (Set of 2)
Hampton Bay Gazebos 10 ft. x 10 ft. Arrow Gazebo Brown/tan GGHL00019
Home Depot
Medea Polished Copper Garden Torch with Yard Stake
Signature Hardware
Arteriors Home - Mosquito Small Bench - DD2015
Great Furniture Deal
© 2015 Houzz Inc. Houzz® The new way to design your home™