Control effects of plant essential oils on powdery mildew of Heracleum dissectum Ledeb.

doi:10.7523/j.ucas.2025.059

Abstract

Abstract: Heracleum dissectum Ledeb., as one of the plants with dual food and medicinal applications, has broad market development prospects, but its industrial development is often restricted by the infection of powdery mildew in the process of its artificial cultivation. In this study, the prevention and treatment of Erysiphe heraclei was analyzed by using the two essential oils in field experiments. The effects on the resistance to E. heraclei was measured through the physiological and biochemical indexes of leaves, observed the morphological changes of spores and hyphae of E. heraclei by scanning electron microscope (SEM). To enhance the prevention and control effectiveness, a combined system of plant essential oils and chemical agents has been established. By optimizing the combination and ratio, the dual goals of reducing the dosage of the medicine and enhancing the efficacy of prevention and control can be achieved. The results showed that the essential oils of Ledum palustre L. (Lpeo) and Rosa chinensis Jacq ‘Crimson Glory’ H.T. (CGReo) had significant effects on the prevention and treatment of powdery mildew of H. dissectum, and both of them could enhance the leaf resistance of H. dissectum. The germination of powdery mildew spores on the leaf surface treated with essential oil was inhibited and the hyphae were folded and bent under SEM; The relative therapeutic effect of one-tenth concentration of ethirimol+0.5 μL/mL essential oil of Lpeo or CGReo on powdery mildew is better than the effect of single application of ethirimol. This study provides certain theoretical references for achieving the effect of reducing quantity while increasing efficiency, expanding the antifungal spectrum of plant essential oils and green control of powdery mildew.

Key words: plant essential oil, Heracleum dissectum, Erysiphe heraclei, control effect, dosage reduction and efficacy enhancement

CLC Number:

S436.44

HAN Jinze, ZHANG Miao, GONG Shufang, WANG Jin’gang, YU Jinghua, CHAI Tuanyao, ZHOU Aimin, QIAO Kun. Control effects of plant essential oils on powdery mildew of Heracleum dissectum Ledeb.[J]. Journal of University of Chinese Academy of Sciences, DOI: 10.7523/j.ucas.2025.059.

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