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CUES: Center for Urban Ecology and Sustainability
Quiz 5: Bees
Do most insecticides kill bees?
Only larvae in nests
Only social bees
How can you avoid killing pollinators when you spray insecticides?
Spray in the evening when bees are not foraging
Spray leaves, not flowers
of the above
Why are systemic insecticides toxic to bees?
insecticides are translocated from the soil to nectar and pollen in
plant increases the toxicity of the insecticide
The plant stops
producing pollen and nectar and starves bees
plant stops growing
What are signs of insecticide toxicity to bees?
All of the
Why are the names of systemic insecticides?
The LD 50 means the dose of the insecticide that kills 50% of the animal
population that it is tested on. A low number indicates that the
Has acute effects
Has chronic effects
Where do I find out the kind of insecticide used in a product?
Look for the words
'active ingredient' or 'A.I.' on the label
Look for the the kind of insect
that is killed by the insecticide
Look for the directions for use
Look for the application rate
What is a contact insecticide?
by contacting the insect when it walks on the plant where the insecticide
kills when the insect eats the leaves where it was sprayed
when the insect sits on the plant
Are organic insecticides non-toxic to bees?
they are always non-toxic
There is no such thing as an organic insecticide
Only when applied during foraging
Which insecticide will not kill foraging bees when sprayed on leaves?
Spinosad active ingredient
Imidacloprid active ingredient
Carbaryl active ingredient
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Last modified on
May 08, 2013