Question 1

how often do you have to apply?

Accepted Answer

The label says:  "Treat Every other week.  Use 6 drops per 100 gallons of water. Use to prevent mosquitoes from breeding in small water gardens and other areas where standing water accumulates."

There is no mention of treating daily.  It's once every two weeks.  Using it daily would kill everything in your pond.  "Mr or Ms. Amazon Customer" who answered earlier saying to apply it daily most likely is mistakenly answering a question regarding some other product, or, they find some sick humor in causing people to kill all their pet fish.  This product is toxic and must be used in accordance with instructions on the label.

Question 2

Is this a liquid or powder?  One picture shows both liquid and powder, but the other just shows powder.  The customer review refer to a liquid.

Accepted Answer

I got the powder yesterday and was hoping that I will get the liquid too.

Question 3

How is this product for dragonflys that I do not want to kill?

Accepted Answer

This might help you, it's from Wikipedia word for word regarding the primary ingredient of this product:
"bacillus thuringiensis israelensis", (Bti), is a group of bacteria used as biological control agents for larvae stages of certain dipterans. Bti produces toxins which are effective in killing various species of mosquitoes, fungus gnats, and blackflies, while having almost no effect on other organisms. Indeed, this is one of the major advantages of B. thuringiensis products in general is that they are thought to affect few nontarget species."  
It doesn't mention dragonflies or other critters that lay eggs in water.  It won't harm the adult dragonflies but I'm not sure the eggs that adults lay in treated water would survive to become adults.

Question 4

Is this product a liquid?

Accepted Answer

Mine came yesterday and it’s the powder form. I was hoping for the liquid instead.

ASIN	B007UTE55A
Allergen Information	Hypoallergenic
Best Sellers Rank	32,088 in Pet Supplies ( See Top 100 in Pet Supplies ) 316 in Aquarium Water Treatments
Brand Name	MICROBE-LIFT
Customer Reviews	4.5 4.5 out of 5 stars (1,342)
Global Trade Identification Number	00097121200365
Included Components	Product Information Guide
Item Form	Liquid
Item Type Name	Mosquito Control, Liquid Treatment for Medium-Sized Decorative Water Gardens Up to 2,000 Gallons, Fountains and Ponds
Item Weight	2 Ounces
Liquid Volume	2 Fluid Ounces
Manufacturer	TopDawg Pet Supply
Manufacturer Part Number	BMC2
Model Number	BMC2
Number of Items	1
Number of Packs	1
Pet Type	Fish
Target Species	Fish
UPC	097121200365 097121200990
Unit Count	59.1471 millilitre

ECOLOGICAL LABS MICROBE-LIFT BMC2 Biological Mosquito Control, Liquid Treatment for Decorative Water Gardens, Fountains and Ponds, 2 Fl Oz

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