dsRNA Bacterial Composition for Japanese Beetle RNAi Control

The patent replaces chemical pesticide systems with a biological RNA interference system. Double-stranded RNA is introduced into the beetle population through infected plants, triggering endogenous silencing of essential genes. This substitution eliminates the need for external chemical applications while achieving population control through the insect's own molecular machinery, thereby resolving the contradiction between effectiveness and environmental harm.

The RNA interference mechanism leverages the beetle's own cellular processes to achieve population control. The introduced dsRNA is processed by the beetle's endogenous RNAi machinery, which naturally degrades target mRNAs. This self-service approach eliminates the need for continuous external chemical interventions and prevents resistance development, as the mechanism targets essential genes that cannot mutate without losing viability.

The patent introduces an intermediary system using plants as vectors for dsRNA delivery. Infected plants produce and accumulate dsRNA within their tissues, which is then ingested by feeding beetles. This plant-mediated delivery overcomes the limitations of direct application by providing stable, long-term dsRNA presence in the insect's digestive system, thereby improving gene silencing effectiveness without requiring complex external delivery devices.

The patent uses a viral or transgenic copying mechanism where the dsRNA-producing element is integrated into the plant genome or maintained as an episomal element. This allows the plant to continuously produce and replenish dsRNA throughout its growth cycle, ensuring sustained exposure for feeding insects. The copying mechanism eliminates the need for repeated applications and maintains reliable gene silencing over time.