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

Qiuping Wang, Haitao Li, Yang Lei, Yue Su and Youhua Long
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Qiuping Wang: Department of Food and Medicine, Guizhou Vocational College of Agriculture, Qingzhen 551400, 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

Agriculture, 2022, vol. 12, issue 3, 1-13

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.

Keywords: chitosan; growth and quality; isopyrazam·azoxystrobin; kiwifruit; leaf spot disease; resistance (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
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