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First report of Alternaria longipes causing kiwifruit leaf spot in China and screening of potentially fungicidal active substances
Ist Teil von
Journal of plant diseases and protection (2006), 2024-06, Vol.131 (3), p.863-871
Ort / Verlag
Berlin/Heidelberg: Springer Berlin Heidelberg
Erscheinungsjahr
2024
Link zum Volltext
Quelle
SpringerLink (Online service)
Beschreibungen/Notizen
Kiwifruit, which is known for its unique flavour and high value, is extensively cultivated in the world, especially in China. In 2022, a unique case of leaf spot disease was discovered in Xifeng, Guizhou Province, China, with symptoms deviating from those reported in previous studies. We isolated the pathogenic fungal strain YYK-A and YYK-F using the tissue isolation method and verified them using Koch’s postulates. The colony appeared white during early growth and gradually turned black at later stages. The conidia exhibited 3–8 transverse septa, 0–2 longitudinal septa and measured 10.0–53.0 × 5.0–13 µm in size. The strain was identified as
Alternaria longipes
, which was supported by phylogenetic analyses based on multigene sequences. The inhibitory activity of five fungicidal active substances against
A. longipes
was investigated using the mycelium growth method to formulate an effective disease management strategy. Honokiol displayed the highest inhibitory activity against
A. longipes
with an EC
50
of 9.57 mg L
−1
. To our knowledge, this is the first report of
A. longipes
causing kiwifruit leaf spot in China.