Acta Agriculturae Zhejiangensis ›› 2021, Vol. 33 ›› Issue (9): 1668-1675.DOI: 10.3969/j.issn.1004-1524.2021.09.11

• Plant Protection • Previous Articles     Next Articles

Fungicides and optimum time for control of pear rust in Tongxiang City, north Zhejiang, China

WU Jiawei1(), YAO Zhangliang1,*(), HU Qiqi2, ZHANG Jie1, CHEN Yi1, JIANG Jianrong3, ZHOU Guoxin2, WANG Xia2,*()   

  1. 1. Bureau of Agriculture and Rural Affairs of Tongxiang, Tongxiang 314500, China
    2. Department of Plant Protection, Key Laboratory for Quality Improvement of Agriculture Products of Zhejiang Province, Zhejiang A &F University, Hangzhou 311300, China
    3. Agricultural Economic Service Center of Wuzhen, Tongxiang 314501, China
  • Received:2020-08-11 Online:2021-09-25 Published:2021-10-09
  • Contact: YAO Zhangliang,WANG Xia

Abstract:

In order to know the outbreak regularity of pear rust disease, optimum control time, and effective fungicide, in this study, monitoring of forming and mature of pear rust’s pathogen teliospore and optimum time, and effects of eight fungicides for disease control were investigated. The results indicated the mature peak of teliospore appeared in mid-March. It was better to control pear rust by fungicide before the first two rain from late March. The control efficiency of fungicides 500×80% mancozeb(WP), 800×30% azole ether pentazolium(SC), and 800×10% difenoconazole (WG) to type Ⅰ bud leaves of pear varieties Yuguan and Chuiguan was 89.62%, 99.46%, 99.38% and 89.62%, 96.90%, 88.53% respectively. The control efficiency of three fungicides to typeⅠand typeⅡ bud leaves was similar except efficiency of 500×80% mancozeb(WP) to type Ⅱ bud leaves was apparently higher than typeⅠ. All three fungicides of 80% mancozeb(WP), 30% azole ether pentazolium(SC), and 10% difenoconazole (WG) could control pear rust effectively, considering their effects on fruit quality, 10% difenoconazole (WG) was the most optimal fungicide for pear rust control. The time of fungicides using was the most crucial factor to pear rust control, the optimum time was the first two rain from late March and spaying before raining was the best.

Key words: pear rust, teliospore, fungicide screening, optimum control time, fruit quality

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