Rnai-based biocontrol for dalbulus maidis to reduce corn stunt disease prevalence

Overview

Corn stunt is a significant agricultural disease spread by the corn leafhopper Dalbulus maidis. Current control strategies, particularly insecticides, are largely ineffective and harm beneficial, non-target species. Conventional breeding for resistant hybrids is also challenging due to inconsistent disease pressure.

This proposal offers an alternative approach: using RNA interference (RNAi) to silence genes critical to D. maidis oogenesis and spermatogenesis. By reducing the reproductive capacity of the insect vector, population growth rates decline, which in turn lowers Corn stunt incidence. The technology is intended for deployment through transgenic plants, providing a species-specific biocontrol method that supports biodiversity preservation.

Technical specifications

• Target organism: Dalbulus maidis, the primary insect vector of Corn stunt disease in maize
• Mechanism: RNAi silencing of reproductive genes involved in oogenesis and spermatogenesis, reducing fecundity and longevity
• Gene identification: A recently generated D. maidis transcriptome enabled identification of reproductive transcript sequences through BLAST alignment with Drosophila melanogaster orthologs
• Delivery method: Virgin males and females will be exposed to dsRNA fragments via artificial diet, then mated with non-interfered insects
• Phenotyping approach: Daily counts of eggs laid and insect survival over seven days, followed by dissection to measure ovary and testis development
• Deployment concept: Integration into transgenic maize plants for field-level vector suppression

Technology readiness level

This research is at an early experimental stage. Transcript sequences specific to D. maidis oogenesis and spermatogenesis have already been identified from an existing transcriptome. The next step is laboratory validation of RNAi efficacy through feeding trials and reproductive phenotyping. Field deployment via transgenic crops remains a future objective pending successful laboratory and greenhouse validation.