Palm Problems: Necrotic Leaflets - symptoms affecting the entire canopy (most or all leaves)

Leaflets of oldest living leaves are necrotic on one side of rachis only (or only some leaf segments necrotic if it is a fan palm) and petiole/rachis has reddish-brown to brown or black streak and vascular discoloration evident in cross-section of petiole.
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IMAGE (click to enlarge)	SYMPTOM DESCRIPTION
	a.palm is Phoenix species Fusarium wilt (primarily P. canariensis) (Fig. 28) Petiole (Rachis) Blight (all Phoenix species) FACTSHEET URL: http://edis.ifas.ufl.edu/PP139 http://edis.ifas.ufl.edu/PP145
	b.palm is Syagrus romanzoffiana or Washingtonia robusta 1) palm rapidly declines (a few months) Fusarium decline (Fig. 7) FACTSHEET URL: Click Here
	2) palm declines very slowly petiole (rachis) blight (Fig. 29) FACTSHEET URL: http://edis.ifas.ufl.edu/PP145
c. palm is not one of the palm species listed above; palm declines very slowly petiole (rachis) blight FACTSHEET URL: http://edis.ifas.ufl.edu/PP145 Note: In most cases, only a diagnostic laboratory can separate a Fusarium disease (Fusarium wilt or Fusarium decline) from petiole (rachis) blight.

Leaflets of oldest living leaves are necrotic on one side of rachis only (or only some leaf segments necrotic if it is a fan palm) and petiole/rachis has reddish-brown to brown or black streak and vascular discoloration evident in cross-section of petiole.