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Chitosan as an Adjuvant to Improve Isopyrazam Azoxystrobin against Leaf Spot Disease of Kiwifruit and Enhance Its Photosynthesis, Quality, and Amino Acids

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  • Qiuping Wang

    (Department of Food and Medicine, Guizhou Vocational College of Agriculture, Qingzhen 551400, China
    Research Center for Engineering Technology of Kiwifruit, Institute of Crop Protection, Teaching Experimental Farm, College of Agriculture, Guizhou University, Guiyang 550025, China)

  • Haitao Li

    (Department of Food and Medicine, Guizhou Vocational College of Agriculture, Qingzhen 551400, China)

  • Yang Lei

    (Department of Food and Medicine, Guizhou Vocational College of Agriculture, Qingzhen 551400, China)

  • Yue Su

    (Department of Food and Medicine, Guizhou Vocational College of Agriculture, Qingzhen 551400, China)

  • Youhua Long

    (Research Center for Engineering Technology of Kiwifruit, Institute of Crop Protection, Teaching Experimental Farm, College of Agriculture, Guizhou University, Guiyang 550025, China)

Abstract

Leaf spot disease caused by Lasiodiplodia theobromae is one of the most serious fungal diseases of kiwifruit production. In this work, the co-application of isopyrazam·azoxystrobin and chitosan against leaf spot disease in kiwifruit and its effects on disease resistance, photosynthesis, yield, quality, and amino acids of kiwifruit were investigated. The results show that isopyrazam·azoxystrobin exhibited a superior bioactivity against L. theobromae with an EC 50 value of 0.1826 mg kg −1 . The foliar application of chitosan could effectively enhance isopyrazam·azoxystrobin against leaf spot disease with a field control efficacy of 86.83% by spraying 29% isopyrazam·azoxystrobin suspension concentrate (SC) 1500 time + chitosan 100-time liquid, which was significantly ( p < 0.05) higher than 78.70% of 29% isopyrazam·azoxystrobin SC 1000-time liquid. The co-application of isopyrazam·azoxystrobin and chitosan effectively enhanced soluble protein, resistance enzymes’ activity in kiwifruit leaves, and reduced their malonaldehyde (MDA), as well as reliably improved their photosynthetic characteristics. Simultaneously, their co-application was more effective in promoting growth, quality, and amino acids of kiwifruit fruits compared to isopyrazam·azoxystrobin or chitosan alone. This study highlights that the co-application of isopyrazam·azoxystrobin and chitosan can be used as a green, safe, and efficient approach for controlling leaf spot disease of kiwifruit and reducing the application of chemical fungicides.

Suggested Citation

  • Qiuping Wang & Haitao Li & Yang Lei & Yue Su & Youhua Long, 2022. "Chitosan as an Adjuvant to Improve Isopyrazam Azoxystrobin against Leaf Spot Disease of Kiwifruit and Enhance Its Photosynthesis, Quality, and Amino Acids," Agriculture, MDPI, vol. 12(3), pages 1-13, March.
    • Handle: RePEc:gam:jagris:v:12:y:2022:i:3:p:373-:d:765628
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    References listed on IDEAS

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    1. Cheng Zhang & You-Hua Long & Qiu-Ping Wang & Jiao-Hong Li & Hua-Ming An & Xiao-Mao Wu & Ming Li, 2019. "The effect of preharvest 28.6% chitosan composite film sprays for controlling the soft rot on kiwifruit," Horticultural Science, Czech Academy of Agricultural Sciences, vol. 46(4), pages 180-194.
    2. Moutoshi Chakraborty & Mirza Hasanuzzaman & Mahfuzur Rahman & Md. Arifur Rahman Khan & Pankaj Bhowmik & Nur Uddin Mahmud & Mohsin Tanveer & Tofazzal Islam, 2020. "Mechanism of Plant Growth Promotion and Disease Suppression by Chitosan Biopolymer," Agriculture, MDPI, vol. 10(12), pages 1-30, December.
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