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Duffy, B. K., and D. E. Gardner. 1995. Spontaneous decline of weedy Myrica faya in Hawaii. Phytopathology 85:1196.
ABSTRACT
Recently observed spontaneous decline of Myrica faya, an introduced weed threatening native ecosystems in Hawaii, may be of importance for control efforts. Decline in vigor proceeds either gradually (>2yr) or rapidly (<2yr) leading to tree mortality. Mature, but not senescent, trees growing in shallow soils are most affected. Principal systems are chronic chlorosis and defoliation affecting individual braches or the entire canopy as a unit. Wood discoloration and root decline were barely observed. Decline occurs at several ecologically-distinct sites in and around Hawaii Volcanoes National Park and affects as many as 72% of the trees within a stand. Decline was not correlated with soil factors, deficiency/toxicity, rainfall, plant competition, or stand density. Rhizoctonia sp., Pachytrype princeps, Hypoxylon moriforme, Phellinus gillvus, 3 wood-boring beetles, and 9 genera of parasitic nematodes were collected from faya, but none were consistently associated with decline. MLOs were not detected in a limited screen with DAPI. Sophonia rufofascia, a recently introduced leafhopper common on faya, causes widespread decline of other plants in Hawaii and may contribute to faya decline.

FULL TEXT
Full text not available for this publication.

HOSTS
No host information available for this publication.


PATHOGENS
No pathogen information available for this publication.


RELEVANT TO BIOCONTROL
Yes.

KEY WORDS
Myrica faya, Firetree.

IMAGES
16_111 -- nematodes from Myrica faya rhizophore 16_111 - nematodes from Myrica faya rhizophore
PATHOGEN: Aspergillus melleus
16_113 -- sections of stems from dying Myrica faya with fungal growths 16_113 - sections of stems from dying Myrica faya with fungal growths
PATHOGEN: Aspergillus melleus
16_114 -- two-spotted leafhopper feeding symptoms (and healthy growth) of Myrica faya, HAVO 16_114 - two-spotted leafhopper feeding symptoms (and healthy growth) of Myrica faya, HAVO
PATHOGEN: Aspergillus melleus

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