CAN PHYTOPHTHORA CACTORUM IN STRAWBERRY BE CONTROLLED BY INDUCED SYSTEMIC RESISTANCE?

Five different compounds were tested as putative elicitors of disease resistance to P. cactorum causing crown rot in strawberry.
Three of the compounds were chemical products (Bion^TM, Algifert^TM and chitosan) and two were biotic (spores or crushed, autoclaved mycelium of Trichoderma harzianum). Cold-stored strawberry plants of two cultivars (Korona and Zephyr) were grown for two weeks in the greenhouse prior to treatment with the putative elicitors.
Two or three days later, plants were inoculated with a zoospore suspension of P. cactorum. Disease was scored on a scale based on the time elapsed from inoculation until the plants died and amount of necrosis in the crown after four weeks.
Two of the putative elicitors had a positive effect on the degree of disease development.
Chitosan or Bion reduced the disease score for both cultivars, but in varying degrees, depending on concentration and addition of Triton X-100. The other four putative elicitors had no or only slight effects on disease resistance.

IV International Strawberry Symposium

H. Eikemo, A. Stensvand, A.M. Tronsmo

Algifert, Bion, chitosan, crown rot, elicitors, Trichoderma harzianum

https://doi.org/10.17660/ActaHortic.2002.567.131