الفطور و البكتيريا المصاحبة لبذور المانجروف (Avicennia sp.)‎ و بعض أساليب مكافحتها

Abstract EN

In Egypt, mangrove, mostly Avicennia mariana, occurs along the Red Sea coast from Hurghada southward to Mersa Halaib.

Adverse conditions along with certain micro-organisms severely impact mangrove development.

This paper describes the effects of seed-borne fungi and bacteria on mangrove seed germination and seedling growth.

Assays detected six genera of fungi on eh seeds, i.e.

Alternaria, Aspergillus, Cladosporium, Drechslera, Fusarium and Penicillium and the bacteria Pseudomonas syringae subsp.

virirdiflava and P.

marginalis.

Fusarium spp.

was the most prevalent fungi isolated.

They caused seed rot, seedling mortality and wilt.

Pseudomonas spp.

were also common and caused various seedling disease including dieback.

Since the seed coat of mangrove seeds harboured the most micro- organisms, removing it minimized seed decay and maximized seed germination.

The best treatment for reducing seed rot, seedling disease and mortality, and improving seedling growth was Trichoderma PROMOT (a biological seed treatment) applied after seed coat removal.