How To ID Almond Cankers

摘要

Recent research shows these scaffold and trunk yield-sappers are far more complex than once thought. CANKERS, which are areas of dead tree tissue, can occur on. the trunks, scaffolds, and branches of almond trees. Appearing as darkened, depressed areas of bark, they have definite margins where the healthy and dead tissue meet. In many cases, the margin of the canker is outlined by "gum balls," or sap that is exuded as the tree's defense pathways are activated. Cankers may be caused by physical injuries such as sunburn or shaker damage, as well as plant pathogens which include bacteria and fungi. In regard to plant pathogens, major fungal canker problems are consistently found within almond orchards, causing tree and scaffold loss.