Host Specificity of a Brazilian Isolate of Alternaria cassiae (Cenargen CG593) Under Greenhouse Conditions

Several Alternaria cassiae isolates were recovered from diseased sicklepod plants (Senna obtusifolia) in the southern regions of Brazil. A representative isolate (Cenargen CG593) was tested for its host range under greenhouse conditions. The fungus promoted symptoms in sicklepod, cassava (Manihot du...

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Bibliographic Details
Published in:Phytoparasitica 2007-03, Vol.35 (2), p.123-128
Main Authors: Pitelli, R.L.C.M, Penariol, M, Pitelli, A.M.C.M, Pitelli, R.A
Format: Article
Language:English
Subjects:
Alternaria cassiae
biological control
biological control agents
broadleaf weeds
cassava
dew
disease incidence
eggplants
fungal diseases of plants
greenhouse production
host range
host specificity
Lycopersicon esculentum
Manihot
Manihot dulce
Manihot esculenta
Melongena
mycoherbicides
plant growth
Senna obtusifolia
Solanum lycopersicum var. lycopersicum
Solanum melongena
tomatoes
weed control
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Summary:Several Alternaria cassiae isolates were recovered from diseased sicklepod plants (Senna obtusifolia) in the southern regions of Brazil. A representative isolate (Cenargen CG593) was tested for its host range under greenhouse conditions. The fungus promoted symptoms in sicklepod, cassava (Manihot dulce), tomato (Lycopersicon esculentum) and eggplant (Solatium melongena) when tested at a spore concentration of 10 super(6) spores ml super(-1). When the plants were inoculated with a suspension of 10 super(5) spores ml super(-1) and held at a dew period of 12 h (cassava) or 18 h (tomato and eggplant), the plants showed symptoms of the disease, but they recovered and continued their normal vegetative growth. These results show that the fungus A. cassiae is safe to use for the control of 5. obtusifolia under Brazilian conditions, because it did not cause excessive damage in the three plants tested.
ISSN:0334-2123
1876-7184
DOI:10.1007/BF02981105