Compounds of the formula I wherein A is CH or N; R 1 is C 1 -C 6 -alkyl, C 2 -C 6 -alkenyl, C 2 -C 6 -alkynyl or C 3 -C 6 -cycloalkyl; wherein the aliphatic moieties of R 1 are not further substituted or carry one, two, three or up to the maximum possible number of identical or different groups R 1a which independently of one another are selected from: R 1a halogen, OH, CN, C 1 -C 4 -alkoxy, C 3 -C 6 -cycloalkyl, C 3 -C 6 -halogencycloalkyl and C 1 -C 4 -halogenalkoxy; wherein the cycloalkyl moieties of R 1 are not further substituted or carry one, two, three, four, five or up to the maximum number of identical or different groups R 1b which independently of one another are selected from: R 1b halogen, OH, CN, C 1 -C 4 -alkyl, C 1 -C 4 -alkoxy, C 1 -C 4 -halogenalkyl, C 3 -C 6 -cycloalkyl, C 3 -C 6 -halogencycloalkyl and C 1 -C 4 -halogenalkoxy; R 2 is hydrogen, C 1 -C 4 -alkyl, C 2 -C 4 -alkenyl or C 2 -C 4 -alkynyl; wherein the aliphatic moieties of R 2 are not further substituted or carry one, two, three or up to the maximum possible number of identical or different groups R 2a which independently of one another are selected from: R 2a halogen, OH, CN, C 1 -C 4 -alkoxy, C 3 -C 6 -cycloalkyl, C 3 -C 6 -halogencycloalkyl and C 1 -C 4 -halogenalkoxy; R 3 is selected from halogen, CN, C 1 -C 4 -alkyl, C 1 -C 4 -alkoxy, C 2 -C 4 -alkenyl, C 2 -C 4 -alkynyl, C 3 -C 6 -cycloalkyl and S p (C 1 -C 4 -alkyl), wherein each of R 3 is unsubstituted or further substituted by one, two, three or four R 3a; wherein R 3a is independently selected from halogen, CN, OH, C 1 -C 4 -alkyl, C 1 -C 4 -halogenalkyl, C 3 -C 6 -cycloalkyl, C 3 -C 6 -halogencycloalkyl, C 1 -C 4 -alkoxy and C 1 -C 4 -halogenalkoxy; p is 0, 1 or 2; and the N-oxides and the agriculturally acceptable salts thereof. A is CH or N; R 1 is C 1 -C 6 -alkyl, C 2 -C 6 -alkenyl, C 2 -C 6 -alkynyl or C 3 -C 6 -cycloalkyl; wherein the aliphatic moieties of R 1 are not further substituted or carry one, two, three or up to the maximum possible number of identical or different groups R 1a which independently of one another are selected from: R 1a halogen, OH, CN, C 1 -C 4 -alkoxy, C 3 -C 6 -cycloalkyl, C 3 -C 6 -halogencycloalkyl and C 1 -C 4 -halogenalkoxy; wherein the cycloalkyl moieties of R 1 are not further substituted or carry one, two, three, four, five or up to the maximum number of identical or different groups R 1b which independently of one another are selected from: R 1b halogen, OH, CN, C 1 -C 4 -alkyl, C 1 -C 4 -alkoxy, C 1 -C 4 -halogenalkyl, C 3 -C 6 -cycloalkyl, C 3 -C 6 -halogencycloalkyl and C 1 -C 4 -halogenalkoxy; R 2 is hydrogen, C 1 -C 4 -alkyl, C 2 -C 4 -alkenyl or C 2 -C 4 -alkynyl; wherein the aliphatic moieties of R 2 are not further substituted or carry one, two, three or up to the maximum possible number of identical or different groups R 2a which independently of one another are selected from: R 2a halogen, OH, CN, C 1 -C 4 -alkoxy, C 3 -C 6 -cycloalkyl, C 3 -C 6 -halogencycloalkyl and C 1 -C 4 -halogenalkoxy; R 3 is selected from halogen, CN, C 1 -C 4 -alkyl, C 1 -C 4 -alkoxy, C 2 -C 4 -alkenyl, C 2 -C 4 -alkynyl, C 3 -C 6 -cycloalkyl and S p (C 1 -C 4 -alkyl), wherein each of R 3 is unsubstituted or further substituted by one, two, three or four R 3a; wherein R 3a is independently selected from halogen, CN, OH, C 1 -C 4 -alkyl, C 1 -C 4 -halogenalkyl, C 3 -C 6 -cycloalkyl, C 3 -C 6 -halogencycloalkyl, C 1 -C 4 -alkoxy and C 1 -C 4 -halogenalkoxy; p is 0, 1 or 2;