New Zealand Plant Protection 59 (2006): 92-96
Colonisation of apple roots by arbuscular mycorrhiza in specific apple replant disease affected soil
K.D.R. Kandula, E.E. Jones, A. Stewart and I.J. Horner
ABSTRACT
In New Zealand, specific apple replant disease (SARD) causes retarded tree growth and poor establishment in replanted apple orchards. In two pot experiments, arbuscular mycorrhizae (AM) colonisation of apple roots in different SARD treated soils was assessed. In the first experiment, AM colonisation was significantly lower in SARD soil compared with non-SARD soil. In this experiment, 45.6% of roots were AM colonised at planting and AM colonisation was increased in both soil types following chloropicrin fumigation or fungicide application. The second experiment used only SARD soil, and at planting, only 0.3% of roots were colonised with AM. AM colonisation was significantly greater in two commercial Trichoderma treatments (pellet and powder formulations) than untreated control, uninoculated blank pellets and chemical nutrient treatments. AM colonisation in fumigated soil was very low and remained similar to the initial root stock material.
Keywords: biological control, Trichoderma spp., chloropicrin fumigation.
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