The present invention relates to the use of substituted aryl- and heteroarylpropargylamines of the formula (I)
1
where
a) R
1
is heteroaryl or aryl, unsubstituted or mono- or polysubstituted by identical or different radicals,
b) A is a group CR
4
R
5
or C═O, where
R
4
is hydrogen, halogen or alkyl;
R
5
is hydrogen, halogen or a substituted or unsubstituted hydrocarbon radical;
c) R
2
and R
3
together with the nitrogen atom to which they are attached form N-heteroaryl or N-heterocyclyl, unsubstituted or mono- or polysubstituted by identical or different radicals,
if appropriate also as N-oxide or salt, as pesticide against arthropods and helminths for protecting plants and animals.