Relationship between stump treatment coverage using the biological control product PG Suspension, and control of Heterobasidion annosum on Corsican pine, Pinus nigra ssp. laricio

摘要: Summary The relationship between the proportion of stump surface covered by biological treatment agent PG Suspension, containing Phlebiopsis gigantea and its efficacy against pathogen Heterobasidion annosum sensu stricto was studied during a first thinning Corsican pine (Pinus nigra ssp. laricio) in Thetford Forest, UK. Suspension manually applied to 100%, 75%, 50% or 0% 150 stumps. Spores H. were inoculated onto 75 stumps, remaining stumps exposed natural airborne spore deposition. The coverage found be quantitative. Covering all with completely excluded pathogen, whereas not treated (the treatment) became infected annosum. Partial (75%) resulted colonizing 40% following artificial inoculation annosum, just 7% ambient infection. Decreasing levels allowed increasing areas colonized Some small gaps closed lateral growth P. gigantea, but it is recommended that operators aim for full give complete protection