Elicitors

Unlike conventional pesticides, elicitors do not directly kill pests. Instead, they activate the plant’s innate immune system, leading to the production of phytoalexins and defense-related proteins.

These substances play a crucial role in inducing Systemic Acquired Resistance (SAR) and Induced Systemic Resistance (ISR), which prepare the plant to defend itself against future attacks.

The group includes various compounds such as oligosaccharides, chitosan, jasmonic acid, and specific peptides derived from microbial cell walls.

By promoting an active immune state, elicitors help crops handle initial pathogen colonization more effectively, reducing the need for aggressive chemical treatments.

Elicitors are used to enhance resistance against a wide range of phytopathogens, including fungi, bacteria, and viruses. They help mitigate issues like powdery mildew, rust, and various bacterial rots.

Beyond biotic threats, they significantly improve tolerance to abiotic stressors such as drought, extreme temperatures, soil salinity, and nutrient deficiencies.

They are widely used in crops, vegetables, orchards, and vineyards, often serving as a key component in Integrated Pest Management (IPM) programs.

Application rates depend on the specific type of elicitor and the crop growth stage. They are typically applied as foliar sprays during critical periods of development.

The most effective strategy is prophylactic application, starting before the infection pressure becomes high. This ensures the plant is fully prepared to trigger its internal defenses.

Regular applications, generally every 14 to 21 days, are recommended to maintain high levels of immunity throughout the active growth phase of the plant.

Over-application of elicitors can lead to a trade-off where the plant redirects too much energy towards defense mechanisms, potentially impacting yield potential.

Elicitors should not be viewed as a substitute for fungicides when dealing with severe disease outbreaks. They are preventative tools that support existing plant health.

Compatibility with other agrochemicals must be verified. Certain tank mixes may interfere with the signaling function of elicitors, rendering the treatment ineffective.