Synergistic pesticidal compositions

A method for the control of a pest, said method comprising the administration to said pest of an effective amount of a composition comprising a first ingredient which is a monocarboxylic acid having about seven to about twenty carbons, or a salt thereof, or a mixture of monocarboxylic acids or salts thereof, and a second ingredient which is an avermectin, ivermectin, or milbemycin, wherein said first ingredient is applied at a rate of at least about 1 lb/acre, and said second ingredient is applied at a rate of about 0.0006 lbs/acre to about 0.02 lbs/acre.

A method for the control of a pest, said method comprising the sequential application to said pest of a first composition comprising a monocarboxylic acid having about seven to about twenty carbon atoms, or a salt thereof, or a mixture of monocarboxylic acids or salts thereof, and a second composition comprising avermectin, ivermectin, or milbemycin wherein said first ingredient is present in a concentration of at least about 0.2% and the second ingredient is present in a concentration between about 3 ppm and about 110 ppm.