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Apple scab is caused by the fungus Venturia inaequalis. Mating among different strains of the fungus occurs shortly after leaf fall with spores developing in the fallen leaves during the winter. Spring rains cause spores to be forcibly discharged; they can be carried long distances by air currents to flowers, leaves, or young fruit. [13]
Trunk injection or endotherapy also known as vegetative endotherapy, [1] [2] [3] is a method of target-precise application of pesticides, [4] [5] [6] plant resistance activators, [7] or fertilizers [8] into the xylem vascular tissue of a tree with the purpose of protecting the tree from pests, or to inject nutrients to correct for nutrient deficiencies.
Fungicides can either be contact, translaminar or systemic. Contact fungicides are not taken up into the plant tissue and protect only the plant where the spray is deposited. Translaminar fungicides redistribute the fungicide from the upper, sprayed leaf surface to the lower, unsprayed surface.
Wood decay caused by Serpula lacrymans (called true dry rot, a type of brown-rot). Fomes fomentarius is a stem decay plant pathogen Dry rot and water damage. A wood-decay or xylophagous fungus is any species of fungus that digests moist wood, causing it to rot.
The fungus has especially become the scourge – if not the Scrooge – of Fraser firs, the most popular Christmas tree in the U.S. ... The work has involved genetically modifying trees to improve ...
Because the fungus overwinters in diseased leaf debris, removing the debris in fall can help reduce the occurrence of the disease. [3] In certain severe cases, fungicides can be implemented to help with control. [7] [12] Copper fungicides sprayed in early spring when leaves are budding and twice more throughout the season help reduce the ...