The polyphagous shot hole borer (SHB), Euwallacea sp.le lefu la Fusarium, Fusarium euwallaceae, ke kokoanyana e ncha: boloetse bo bakang kotsi le lefu ho lifate le lihlahla tse ngata tsa matsoalloa le mekhabiso e thata karolong e ka boroa ea California. Khukhwane ya ambrosia e na le mefuta e mengata e fapaneng mme e ka phethela ntshetsopele ho> mefuta e 20, ho kenyeletswa le avocado, Persea Amerika, 'mapa oa lekhasi le leholo, Acer macrophyllum, moholo oa lebokose la California, acer negundo ho na le. californicum, California sycamore, Platanus racemosa, lebōpong la leoatle live oak, Quercus agrifolia, linaoa tsa castor, Letshwao le tlwaelehileng, moluoane o mofubelu, Salix laevigata, le alder e tšoeu, Alnus rhombifolia.
US Forest Service Region 5 Forest Health Protection haufinyane tjena e entse tokomane e bontšang matšoao a kotsi a entsoeng ke SHB. Tobetsa mona ho jarolla tokomane.