Integrated clay mineral and reflective mulch system for whitefly control and TYLCV reduction in tomato production

Overview

Tomato production faces significant threats from viruliferous whiteflies that transmit Tomato yellow leaf curl virus (TYLCV), a highly destructive pathogen. Existing resistant cultivars often carry poor horticultural traits and remain vulnerable under high disease pressure and direct feeding damage. This research proposes an integrated pest management system that combines novel clay mineral particle repellents with metallic reflective mulches to disrupt whitefly host-finding behavior and reduce viral transmission in tomato fields.

The approach targets the whitefly's olfactory and visual cues, repelling the insect before it can probe and feed on plant tissue. By coating plants with clay particles to reduce palatability and using reflective mulches to interfere with visual orientation, the system aims to lower whitefly populations below the threshold needed to suppress TYLCV spread.

Technical specifications

Core technology components:

• Three novel clay particle repellent formulations applied once or twice weekly to create a whitish coating on plant surfaces
• Metallic reflective mulches that reflect light and repel whiteflies, particularly effective during early-season growth stages
• Integrated application system designed for tomato transplant beds following Florida production practices

Mechanism of action:

• Clay coatings make plant tissue less palatable, reducing whitefly attraction and feeding
• Reflective mulches disrupt visual cues whiteflies use to locate host plants
• Combined approach addresses both rapid plant growth (which exposes uncoated tissue) and high virus pressure conditions

Validation approach:

• Field trials with susceptible and tolerant tomato varieties transplanted into metallic mulch beds
• Randomized plot design with 15 plants per plot and four replications
• Three clay treatments compared against untreated control plots
• Weekly assessment of whitefly adult and nymph populations
• Viral incidence and severity rated using the Horsfall-Barratt scale
• Molecular diagnostics to confirm TYLCV presence in both symptomatic and non-symptomatic plants

Technology readiness level

This research builds on prior findings demonstrating that clay particles can reduce whitefly populations by creating a protective whitish coating on plant surfaces. However, previous trials showed that population reductions alone did not decrease viral incidence under high disease pressure, likely because rapid plant growth exposed uncoated tissue to feeding. This validation phase addresses that limitation by integrating reflective mulches for early-season protection and optimizing clay application frequency. Two field trials are planned to evaluate the combined system's effectiveness under commercial-style conditions, positioning the technology for further development toward practical deployment in tomato production systems.