The present invention relates to a pyrimidine compound of formula (1):
wherein R
1
is C
3
-C
7
alkynyl; R
2
is hydrogen, halogen, or C
1
-C
3
alkyl; and R
3
is C
1
-C
8
alkyl that may be substituted with halogen or C
1
-C
3
alkoxy, or C
3
-C
6
cycloalkyl (that may be substituted with halogen or C
1
-C
3
alkyl) C
1
-C
3
alkyl; a pesticidal composition comprising the pyrimidine compound as an active ingredient; and a method for controlling pests comprising applying the pyrimidine compound to pests or habitats of pests.