Disease note describing the first record of Verticillium dahliae on olive in Maltapeer-reviewe

Mifsud, David

Porta-Puglia, Angelo

English

OAR@UM

Journal of Plant Pathology (2005), 87 (2), 149-150 @ Edizioni ETS Pisa, 2005 DISEASE NOTE FIRST RECORD OF VERTICILLIUM DAHLIAE ON OLIVE IN MALTA A. Porta-Puglia and D. Mifsud Ministry for Rural A//airs and the Environment, Department 0/ Plant Health, Agricultural Research & Development Centre, GJjammierz~ Marsa CMR 01, Malta 149 Wilting of three-year old olive trees (Olea europaea L.) was observed in a grove in Gnaxaq (Malta), in April 2004. Verticillium dahliae Kleb. (Hawksworth and Tal-boys, 1970) was isolated on tap-water agar (TWA) from wood explants of wilted twigs. All the isolates abun-dantly produced microsclerotia on TWA and on potato dextrose agar (PDA). On May 2004, colonies of V dahliae grown on PDA were suspended by a blender in sterile tap water to a concentration of 5.105 CFU mP on PDA. Five one-year-old olive seedlings were inocu-lated by root immersion in the inoculum suspension and transplanted in 16 cm diameter plastic pots containing a mixture (1:1:1 w/w/w) of soil, sand and peat. Five con-trols seedlings were treated in the same way with sterile tap water. All the plants were kept under climatised glasshouse conditions (20±4°C) and watered to field ca-pacity when needed. Epinasty and moderate defoliation were first observed on the inoculated plants one month after inoculation. In the following months smaller twigs started to wilt, then the wilting extended to larger branches. V dahliae was re-isolated in December from all the inoculated plants. No symptoms were observed on control plants and all attempts to isolate the pathogen from them failed. This is the first record of V dahliae on olive in Malta. Hawksworth D.L., Talboys P.w., 1970. Descriptions of Patho-genic Fungi and Bacteria No. 256. Commonwealth Myco-logical Institute (CM.I.), Kew, Surrey, U.K. Corresponding author: A. Porta-Puglia Fax: +356.25.904211 E-mail: angelo.porta-puglia@gov.mt Received 23 February 2005 Accepted 23 March 2005 

First record of Verticillium dahliae on olive in Malta

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First record of Verticillium dahliae on olive in Malta

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