![]() cinerea can attack different plant organs, including flowers, leaves, fruits, shoots, and soil storage organs. It has been recorded that the pathogen can attack more than 200 plant species and results in considerable economic losses worldwide ( Williamson et al., 2007). cinerea was the only pathogenic fungus causing tree peony gray mold in Luoyang through the identification of a large number of samples based on morphological characteristics and gene sequencing. cinerea (Hansen, 2009 Pfleger et al., 1998). Studies have reported that the main pathogens causing gray mold on tree peony are Botrytis paeoniae and B. The symptoms seriously affect the ornamental and commercial values of the plants. However, gray mold invariably occurs on herbaceous peony plants, especially when grown in the greenhouse ( Yang et al., 2017). They are unique, traditional, precious plants in China and they have also been cultivated extensively in the United States, France, the Netherlands, and more ( Zhao and Tao, 2011). Nowadays, tree peonies have become an internationalized ornamental as well as oil plant and are widely cultivated in many countries ( Cheng, 2007 Liu et al., 2018 Zhang et al., 2018). They are an important group of flowering plants referred to as “the king of flowers” as a result of their large flowers, gorgeous color, elegant shape, and rich fragrance. Tree peonies belong to section Moudan of the genus Paeonia in the family Paeoniaceae. Keywords: conidial germination conidia production germ tube elongation inhibitory efficacy mycelium growth rate peony gray mold cinerea by inhibiting the growth of mycelium and the production of conidia, so they could be used as control fungicides during the occurrence phase of the disease. Carbendazim, procymidone, and diethofencarb mainly inhibit the reinfection of B. The results indicated that carbendazim and diethofencarb could be used as protective fungicides to spray in the early stage of disease occurrence to inhibit conidia germination and germ tube elongation, so as to reduce the infection rate of B. The inhibitory effect of procymidone was second only to that of carbendazim on colony expansion. The inhibitory effect of diethofencarb was only slightly less than that of carbendazim on conidia production, germination, and germ tube elongation. The results showed that carbendazim had the strongest inhibition effect against all four stages of B. The inhibitory efficacy of five fungicides on four asexual stages was measured in the petri dish containing culture medium amended with a tested fungicide at various concentrations. The objective of this study was to test fungicides with different mechanisms of action in controlling B. Currently, chemical control is still the main means of managing the disease in China. Gray mold caused by Botrytis cinerea has become an important limiting factor for tree peony production.
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