Defeated major resistance loci may act as Trojan horses compromising resistance pyramiding in grapevine. - Possamai T; Wiedemann-Merdinoglu S; Lacombe MC; Dorne MA; Griem E; Fuchs R; Bogs J; Baltenweck R; Avia K; Merdinoglu D; Hugueney P (IScience, 2026)