Effector that suppresses plant defense responses during the early stages of pathogen infection. Suppresses cell death induced by effectors and PAMPs in plant hosts (PubMed:21653195). Is able to induced cell death in tomato, tobacco, eggplant, and potato, but not in A.thaliana (PubMed:28134441). Interacts with and destabilizes host 1-aminocyclopropane-1-carboxylate synthases. By suppressing type2 ACS-catalyzed ethylene biosynthesis, Avh238 facilitates Phytophthora infection (PubMed:30394556).