Deuterophoma tracheiphila . [Descriptions of Fungi and Bacteria].

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Abstract
A description is provided for Deuterophoma tracheiphila . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Citrus limon ; also Citrus aurantium, C. grandis, C. medica and rough lemon. DISEASE: Mal secco of Citrus spp., mainly lemon (C. limon ). The first, although less specific, symptom of this vascular disease (tracheomycosis) is a sudden wilt and death of the leaves. If infection occurs towards the base of the tree or through the roots collapse is quick and the whole tree is eventually killed. Depending on the pattern of infection wilt may begin in one section or in several parts of the tree. If infection begins in the upper canopy spread of the leaf and branch collapse is much slower. Cuts into the wood (before wilt and death of the bark) reveal the characteristic orange-yellow to reddish discoloration of the vascular tissue. The host epidermal covering over the pycnidia assumes an ashy appearance. GEOGRAPHICAL DISTRIBUTION: Found in the Mediterranean and Black Sea areas: Algeria, Cyprus, France, Greece (including Crete and the Aegean Islands), Israel, Italy (including Sardinia), Lebanon, Syria, Tunisia, Turkey, USSR (Republic of Georgia and Caucasus). Countries in the region that appear free from mal secco are Morocco Portugal and Spain (43, 3223). A record from Colombia (Choco, 46, 3029) probably requires confirmation and one for Uganda should be deleted (CMI Map 155, Ed. 2, 1966). TRANSMISSION: Water-borne from host debris.

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