Characterization of the host range and sensitivity to fungicides of Trichothecium spp. associated with fruit rot in the field and in storage |
| |
| Authors: | Yingbin Li Yixiang Liu Zhiping Zhang Kaiyuan Shen Jianjun Hao Laixin Luo Jianqiang Li |
| |
| Institution: | 1. Department of Plant Pathology, China Agricultural University, Beijing Key Laboratory of Seed Disease Testing and Control, Beijing, China;2. Key Laboratory for Agro-Biodiversity and Pest Control (Ministry of Education), College of Plant Protection, Yunnan Agricultural University, Kunming, China
State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming, China;3. School of Food and Agriculture, The University of Maine, Orono, Maine, USA |
| |
| Abstract: | During 2017–2019, we observed Trichothecium spp. causing fruit rot in the field and in storage. This study was conducted to examine morphological differences of the species from different hosts, reveal the species’ potential host range, and evaluate the efficacy of five fungicides. Six strains of Trichothecium spp. isolated from nectarine, peach and walnut were selected. Although the colony morphology, mycelial growth rate and spore size differed among hosts, phylogenetic analysis based on the internal transcribed spacer and part of the 5? end of the β-tubulin gene showed that all tested strains belonged to Trichothecium roseum. For its host range, 23 kinds of fruit were examined using T. roseum strain YT-1 as an inoculum; 10 kinds of fruit, including pear, apple, mango, Chinese chestnut, pepino melon, fig and durian, were susceptible to T. roseum, with minimum inoculation concentrations ranging from 104 to 105 spores/ml. The fungicides that most effectively inhibited the six isolates were fluazinam and fludioxonil, with EC50 values of 0.07–0.1 and 0.01–0.04 μg/ml, respectively, followed by difenoconazole (0.81–2.96 μg/ml), boscalid (5.43–13.51 μg/ml) and azoxystrobin (9.18–27.25 μg/ml). Improvement of the shelf life of nectarines held in plastic trays was explored using allyl isothiocyanate (AITC) against T. roseum YT-1. The application of 10 μl/L AITC significantly suppressed disease symptoms. The findings provide useful information for future disease emergency management in the field and for food preservation. |
| |
| Keywords: | allyl isothiocyanate disease emergency management fruit rot fungicides Trichothecium roseum |
|
|
