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Cat L Chapter 11

Chapter 11 - Black Flies

QuestionAnswer
What is a common name for black flies? Biting gnats
What is the primary control material used to treat for black flies? BTI
What is the abbreviated form of Bacillus thuringiensis israelensis? BTI
What is the term for the velocity of moving water? Discharge
How is discharge measured? Cubic feet per second
Why do female black flies feed on blood? Egg development
Black fly control can be done with a permit from which agency? Minnesota Department of Natural Resources
How many species of black fly occur in Minnesota? 30
How many species of black flies in Minnesota are considered pests? 4
What is the ideal location to collect black flies for surveillance purposes? Edge of the woods in a shaded area
True or False: Black flies and biting gnats are the same thing. True
When are female black flies most active? During the day, a couple hours after sunrise to a couple hours before sunset
True or False: Depending on the species, black flies feed on humans, livestock, poultry, wildlife, and birds. True
True or False: Black fly larvae require moving water to develop, but only lay eggs directly onto the water. False
What is the ideal site for surveilling black fly larvae in mid-April? Small streams
What is the best way to determine treatment effectiveness? Adult surveillance
True or False: While Bti is the most effective product for controlling black flies, other products can be used at the technician’s discretion. False
After the application of Bti, post-treatment checks are conducted generally _ hours after a treatment at 250 meters downstream from the application site. Three
_ or more larvae are collected to determine the rate of control. The control is then calculated by dividing the number of dead by the total number of larvae collected. 100
True or False: Non-target monitoring by the MMCD has shown a substantial effect on populations of zooplankton and many insects in treatment areas compared to nontreatment areas, but treatment is allowed to continue because it’s viewed as beneficial. False
Created by: Rebecca_Miller
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