Phytophthora ramorum - The Food and Environment Research ...
Phytophthora ramorum - The Food and Environment Research ...
Phytophthora ramorum - The Food and Environment Research ...
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Kalmia & Leucothoe leaf spot<br />
Infection usually occurs at the leaf tip <strong>and</strong> spreads through the leaf tissue towards the leaf base,<br />
causing a brown to black discoloration. Other disease pathogens known to cause leaf infections in<br />
Kalmia are Mycosphaerella <strong>and</strong> Phomopsis. In Leucothoe, Cylindrocladium can cause leaf lesions but<br />
unlike P. <strong>ramorum</strong>, it can also girdle <strong>and</strong> kill stem tissue.<br />
Leucothoe leaf necrosis<br />
Kalmia leaf blight<br />
Camellia leaf blight<br />
Brown to black spots occur at the tips or edges of the leaves <strong>and</strong> can result in entire leaf death <strong>and</strong><br />
rapid leaf drop. Stem die-back may also occur. Symptoms caused by the opportunistic wound<br />
pathogens Pestalotiopsis <strong>and</strong> Glomerella can be confused with those of P. <strong>ramorum</strong> <strong>and</strong> laboratory<br />
tests are essential for correct diagnosis.<br />
Camellia leaf blight<br />
Camellia leaf necrosis <strong>and</strong> wilting<br />
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