In general, infection levels of control treatments
were stable and reproducibility of results was satisfactory,
meaning that the test systems are well
suited to perform primary screenings of fungicidal
activity. However, results of elicitor screening tend
to vary considerably between experimental sets. The
reference elicitor used as a standard (BABA) showed
variable effects. Several of the substances were run
in two independent experimental sets in order to
obtain a more precise assessment of the substances’
potential. Many of the tested substances are not well
formulated for application on grapevine. However,
elicitors need to interact with plant tissue and therefore
depend on spread on the plant’s surface. The
efficacy of candidate substances might therefore be
considerably improved by optimum formulation.