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Inhibition of fungal pathogens of woody plants by the plant growth regulator paclobutrazol
Author(s) -
Jacobs Karel A,
Berg Lisa C
Publication year - 2000
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/(sici)1526-4998(200005)56:5<407::aid-ps139>3.0.co;2-t
Subject(s) - paclobutrazol , shoot , fungicide , gibberellin , biology , spore germination , mycelium , growth regulator , pruning , horticulture , botany , germination , plant growth , woody plant , auxin , spore , ornamental plant , biochemistry , gene
Mycelial growth in vitro of eight plant pathogenic fungi was inhibited 25–100% by the gibberellin inhibitor paclobutrazol. This chemical is currently registered for use on landscape trees and shrubs to minimize shoot growth and extend pruning intervals. Fungicidal activity was evident at dosages 200 times more dilute than the typical rate recommended for field use to retard shoot growth, and the effect persisted indefinitely. Spore germination was reduced by a factor of at least two, and as much as 66 × compared to the control in four of six fungi tested. Rhizomorph production in Armillaria gallica Marxmüller & Romagnesi was almost completely eliminated. © 2000 Society of Chemical Industry