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Ralstonia solanacearum is a major plant pathogen causing bacterial wilt, whose unpredictable onset hinders timely detection and effective control. Here, we report the design, preparation and field use of a dual pH-responsive multifunctional double network (DN) hydrogel for the efficient and sustainable control of bacterial wilt. The primary network of carboxylated agarose chelates Zn 2+ and loosens under acidic conditions (pH ≤ 5) to release a pesticide (zhongshengmycin) and Zn 2+ , while the secondary L-phenylalanine (Phe)/ Zn 2+ network disassembles to provide additional bioactive components (Phe and Zn 2+ ). This dual-triggered release achieves a combined antibacterial effect, enhances plant growth, and activates plant disease resistance pathways. A simple root application protects plants for up to 14 days, and field experiments demonstrate disease control for up to 30 days, significantly preserving tomato yield. Here, we present a sustainable, effective system for managing bacterial wilt and highlight the potential of smart hydrogels in crop protection. Bacterial wilts unpredictable onset makes control difficult. Here, the authors report on a dual pH-responsive hydrogel system which releases antimicrobial agents and plant immune elicitors, L-phenylalanine and zinc, in acidic soils to enable control of bacterial wilt.

In summary, our study establishes that NbTLP1 plays a crucial role in mediating the SA signalling pathway, thereby contributing to the suppression of P. capsici infection through its interaction with NbPR1 to form a heterodimer. These findings provide a fundamental basis for the genetic enhancement of P. capsici‐resistant crops through targeted breeding strategies.