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Disease:
Gliocladium blight (Pink rot) |
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Pathogen:
Gliocladium vermoeseni
(fungus) |
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Hosts: Archontophoenix cunninghamiana,
Chamaedorea elegans, Chamaedorea erumpens, Chamaedorea seifrizzi, other Chamaedorea spp., Chamaerops humilis, Dypsis decaryi, Dypsis lutescens, other Dypsis spp., Howea belmoreana, Howea fosteriana, |
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Symptoms:
Invasive rot of buds, petioles, leaf blades and trunks/stems; dark brown
necrotic areas near the base of the stem on most palms; gummy exudates;
premature death of fronds; necrotic streaks from base of rachis; chlorotic
pinnae; stem girdling; plant death. |
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Signs: Tremendous
number of pink- to salmon-colored spore masses on the surface of diseased
plants. |
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IPM: Minimize
plant wounding; use of approved fungicides, especially as a prophylactic
during transplanting; trunk surgery followed by fungicides; rogue diseased
plants from nursery; minimize water splashing between plants; remove dead
leaves from each potted plant (while avoided stem injury) followed by
application of a general contact fungicide (maneb or mancozeb) or systemic
fungicide (such as thiophanate methyl); use increased plant spacing; promote
air movement and decreased relative humidity; irrigate in morning to avoid
prolonged periods of foliar wetness; grow crops under cover where needed to
avoid excessive rainfall; maintain good pest control program to minimize plant
injury due to insect feeding. |
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Fungicides*: Dithane, Thiophanate methyl.
Apply fungicides after removing diseased leaves. |
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*Named products are not necessarily recommended by the University of Hawaii.
*Always follow the pesticide label instructions.