ORIGINAL ARTICLE
Efficacy of fungicides and essential oils against bacterial diseases of fruit trees
1
Research Institute of Horticulture, Pomology Division
Pomologiczna 18, 96-100 Skierniewice, Poland
Submission date: 2012-09-04
Acceptance date: 2012-10-04
Corresponding author
Artur Mikiciński
Research Institute of Horticulture, Pomology Division Pomologiczna 18, 96-100 Skierniewice, Poland
Research Institute of Horticulture, Pomology Division Pomologiczna 18, 96-100 Skierniewice, Poland
Journal of Plant Protection Research 2012;52(4):467-471
KEYWORDS
TOPICS
ABSTRACT
In the framework of the performed studies, the antibacterial activity of the following fungicides was evaluated: Miedzian
50 WG (active substance – a.s. 50% copper oxychloride), Ridomil MZ Gold 68 WG (a.s. 3.8% metalaxyl-M and 64%, mancozeb),
Euparen Multi 50 WG (a.s. 50% tolylfluanid), Captan 80 WG [a.s. 80% N-(captan)], Dithane Neotec 75 WG (a.s. 75% mancozeb).
The evaluation also concerned the essential oils: lavender, sage, lemon balm, clove, and a preparation based on thyme oil (BioZell).
Each preparation and compound was tested against the following bacterial pathogens:
Erwinia amylovora
,
Xanthomonas arboricola
p v.
corylina, X. arboricola
p v.
juglandis
,
Pseudomonas syringae
p v.
syringae
,
Agrobacterium tumefaciens
(presently
Rhizobium radiobacter
). Each
preparation and compound was tested at a concentration of 1,000 ppm of active substance. Copper oxychloride was also tested at
a concentration of 1,500 ppm. Among the tested fungicides, metalaxyl-M with mancozeb, mancozeb alone, and copper oxychloride
inhibited all of the tested strains of pathogenic bacteria. Tolylfluanid did not inhibit any of the bacteria used. Out of the investigated
essential oils, the strongest inhibitors of bacteria were: sage, cloves, and BioZell.
The protective activity of the above mentioned fungicides was also evaluated
in vivo
. They were assessed against fire blight on apple
blossoms and pear fruitlets, against bacterial canker on sweet cherry fruitlets, and against crown gall on sunflower seedlings (the test
plant). All fungicides were applied at the same concentrations as those in the
in vitro
tests. Only copper oxychloride was found to
show protective activity against the studied diseases. This result indicates that the antibacterial properties of the other fungicides did
not correspond with their activity on the plant organs used in the
in vivo
experiment.
CONFLICT OF INTEREST
The authors have declared that no conflict of interests exist.
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