pyrethroid
1
8.3
- noun
- /paɪˈrɛθrɔɪd/
- Specialized
:
pirético
- The survey shows that pyrethroid-resistant populations of pollen beetles were the dominant population type in all the countries.
- pyrethroid insecticide
- pyrethroid metabolites
- pyrethroid pesticides
Examples
-
Organophosphates and pyrethroids remain common chemical choices for growers battling whiteflies.
Academic text (1997) -
One pyrethroid killed all the caged sharpshooters within 6 hours.
Academic text (2001) -
In this case, the improvement is long residual action when the pyrethroid is used as a surface spray.
Academic text (1998) -
Based in part on the team's studies, the pyrethroid cyfluthrin is already approved for sharpshooter control.
Academic text (2001) -
Once the mosquitoes landed, they would be killed by a synthetic pyrethroid insecticide that kills the insects on contact.
Academic text (1996) -
With this approach, crops wouldn't need several costly sprays of pyrethroids late in the season, say the scientists.
Academic text (1997) -
One field was sprayed 13 times and the other 15; insecticides used included pyrethroids, organophosphate, and Bt.
Academic text (1994) -
In August 1993, Snodgrass discovered that tarnished plant bugs, Lygus lineolaris, had become resistant to pyrethroids, a class of insecticides commonly used to control them.
Academic text (1999) -
Many households use pyrethroid sprays to control insect pests in their gardens.
-
Farmers often apply pyrethroid insecticides to protect their crops from harmful insects.
Synonyms
108
3.5
A chemical used to kill insects and animals that harm crops or spread disease
26
4.1
A chemical used to kill insects that harm crops or homes
How Toxic
- Specialized
1
7.5
- Specialized
3
8.9
- Specialized
1
8.8
- Specialized
26
4.1
- Specialized
1
8.3
Surface Forms
Morphology
pyrethroid = pyrethrin (semi-transparent) = pyrethr + oid
The suffix '-oid' clearly means 'like' or 'resembling', but the root 'pyrethr-/pyrethrin' is specialised technical vocabulary, so the relation is not immediately clear to average learners.
Etymology
The word pyrethroid comes from pyrethrum, the natural insect-killing flower extract, plus the ending -oid, which means 'like', as in the word humanoid meaning 'like a human'. So a pyrethroid is a man-made chemical 'like' pyrethrum and works as an insect killer similar to the natural one.