Articles
BIOLOGICAL CONTROL OF FUSARIUM WILT DISEASE OF CARNATION BY A NON-PATHOGENIC ISOLATE OF FUSARIUM OXYSPORUM
Emphasis was put on the use and effects of the non-pathogenic isolate of F. oxysporum 618–12. In some experiments the effects of 2 other antagonists, viz. Trichoderma harzianum and Streptomyces griseo-viridis were also investigated.
The experiments were done in natural soil in raised benches and in systems with artificial substrate (rockwool) with recirculation of the nutrient solution.
In all experiments the addition of 618–12 reduced disease incidence on the susceptible cultivar Lena as well as the moderately resistant cultivar Pallas considerably.
Disease reduction on Lena was generally more than 70%. The effects on disease incidence on Pallas were relatively even higher in some experiments.
In one experiment a single application of 618–12 to control F. oxysporum f. sp. dianthi in the subsoil resulted in only 3% diseased plants of Lena in the first crop after one year and only 6% in the second crop after another year without an application between the two crops.
Addition of S. griseo-viridis had almost no positive effects on disease incidence.
Only on Pallas some small effects were noticed.
The same applied for the effects of T. harzianum. On Lena disease control by this antagonist was inconsistent and unsatisfactory.