Fungicide Efficacy in Prevention of Root Rot in Fraser Fir Seedlings Incited by Phytophthora cactorum and P. drechsleri [2010-2011]
During the summers or 2010 and 2011 I conducted outdoor experiments in raised planting boxes to assess the effectiveness of several fungicides to prevent Phytophthora root rot of Fraser fir (Abies fraseri) seedlings incited by Phytophthora cactorum and P. drechsleri. The fungicides tested were dimethomorph, fosetyl-Al, hydrogen dioxide, mefenoxam, and propamocarb hydrochloride.
Phytophthora inoculum cultured on rice.
The planting boxes during one of the experiments.
Analyzing Fraser fir seedlings during one of the experiments.
The difference between a non-protected seedling and a seedling protected with dimethomorph.
Isolation of Phytophthora from roots or diseased seedlings.
I tested the sensitivity of the Phytophthora isolates used in the experiments to label recommended rates of fosetyl-Al, hydrogen dioxide, fosetyl-Al, mefenoxam, and propamocarb hydrochloride via lab plate testing.
Plate testing for sensitivity to mefenoxam.
This study was accepted for publication in HortTechnology and is currently in press.
