A pesticidal composition comprises at least one compounds selected from a compound of formula, or any agriculturally acceptable salt thereof, wherein R
1
, R
2
, R
3
, R
4
, R
5
, R
6,
R
7
, R
8
, Q, Z, L, L
a
, and x are as described herein. A method of controlling pests comprises applying the pesticidal composition near a population of pests.