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Disease:
Pseudocercospora leaf spot |
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Pathogen:
Pseudocercospora rhapisicola, Pseudocercospora spp. (fungus) |
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Hosts: Adonidia merrillii,
Chamaedorea erumpens, Chamaedorea sp., Cocos nucifera, Hyophorbe
sp., Pritchardia
spp., Raphis
excelsa, Rpahis sp., and Syagrus romanzoffiana |
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Symptoms:
a slowly developing disease; initial leaf spots are tiny, faintly chlorotic
or light green flecks less than 0.5 mm diameter; mature lesions are
elliptical or circular along parallel veins; mature lesions are often
surrounded by pinpoint satellite (secondary) lesions; large spots eventually
coalesce, becoming irregularly circular to elliptical surrounded by chlorotic
halos; premature defoliation. |
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IPM: strict
sanitation and removal of infected leaves; solid-cover greenhouses; approved
fungicides (mancozeb); reduce overhead irrigation;
plant spacing; humidity control |
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Fungicides*: Dithane
(mancozeb); Banner Maxx,
Medallion, Heritage, others |
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