Compositions (feeding deterrent/repellent for Halyomorpha halys) containing at least two compounds selected from tridecane, E-2-decenal, isolongifolanone, isolongifolenone, and at least one isolongifolenone analog having the following formula: wherein R1 is hydrogen, an oxygen, a C1-10 alcohol, aldehyde, alkyl, ether, or esters of said alcohol with a C1-10 saturated or unsaturated, straight or branched acid and R2 is hydrogen, an oxygen, a C1-10 alcohol, aldehyde, alkyl, ether, or esters of said alcohol with a C1-10 saturated or unsaturated, straight or branched acid; optionally there is a double bond between carbons 5 and 6 and R2 is hydrogen; and optionally a carrier or carrier material. Also methods for deterring feeding/repelling Halyomorpha halys involving treating an object or area with a Halyomorpha halys deterring feeding/repelling effective amount of at least one compound selected from the above compounds.