Articles

EVALUATION OF A SAND-BRAN INOCULATION TECHNIQUE FOR ASSESSMENT OF RESISTANCE OF APPLE SEEDLINGS AGAINST PHYTOPHTHORA CACTORUM (LEBERT & COHN) SCHROETER

Article number
538_45
Pages
263 – 266
Language
Abstract
A sand-bran inoculation technique was evaluated to assess apple (Malus x domestica Borkh.) seedlings resistance to collar, crown and root rot caused by Phytophthora cactorum. Root dry weight and shoot height were used as a measure of resistance.
Five P. cactorum isolates were tested.
Inoculum was mixed with sterile planting medium to make up mass (inoculum):mass (planting medium) concentrations of 0.0, 0.5, 1.0, 2.0, 5.0, and 10.0% inoculum levels.
Thirteen week-old cv.
Jonathan seedlings were transplanted into the inoculated soil and kept in a greenhouse for 13 weeks at 25 °C with daily watering.
All tested isolates were pathogenic to seedlings but differed significantly in their levels of aggressiveness.
The degree of disease at varying inoculum concentrations did not differ significantly.

Publication
Authors
P.T. Zondo, I.F. Labuschagné, C. Linde, S. Denman
Keywords
Phytophthora, aggressiveness, crown rot, apples, inoculation technique
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