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| Raspberry spur blight ： ウィキペディア英語版 |
Raspberry spur blight
Raspberry Spur Blight is caused by the fungus ''Didymella applanata''. This plant pathogen is most problematic on red raspberries ''(Rubus idaeus)'' than on black or purple raspberries. The fungus infects the leaves first and then spreads to the cane. It causes necrotic spots on the cane near the base of the petiole attachment. Raspberry Spur Blight can cause a significant reduction in yield, fruit blight, premature leaf drop, and weak bud and cane growth. The magnitude of damage is not clearly understood in the United States, however, studies from Scotland suggest damage to the cane itself is limited.〔Ellis, Michael A. (“Spur Blight of Red Raspberries” ), 2008.〕 The disease has minor economic impacts by reducing leaves in the summer or killing buds. Major economic damage occurs if the disease manages to kill the entire cane.
In the United States, this disease is found in Oregon and Washington. 〔(【引用サイトリンク】url=http://pnwhandbooks.org/plantdisease/raspberry-rubus-sp-spur-blight )〕
== Signs ==
In the late summer, the bark of infected areas split and the lesions produce fruiting bodies called pycnidia. Pycnidia appear as small black dots to the naked eye and can been seen as flask-shaped structures under a microscope. Perithecia, another fruiting body, forms after the pycnidia. Perithecia appear as medium, black, erupting dots.〔 In the spring, spur blight can be mistaken for winter injury therefore it is important to scout for these signs in September to assess the potential damage that will be done in the following season.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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