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Chinese Journal of Biological Control ›› 2024, Vol. 40 ›› Issue (6): 1319-1330.DOI: 10.16409/j.cnki.2095-039x.2024.02.061

• RESEARCH REPORTS • Previous Articles    

Preparation of Wettable Powder Formulation of Trichoderma harzianum M-17 Chlamydospores and Its Field Control Effect on Potato Dry Rot

WANG Xigang1, GUO Chengjin1, JIAO Yang2, ZHAO Pei1, TIAN Jing1, ZHANG Lirong1, SHEN Ruiqing1   

  1. 1. Ningxia Key Laboratory of Plant Disease and Pest Control/Institute of Plant Protection, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan 750002, China;
    2. College of Agriculture and Ecological Engineering, Hexi University, Zhangye 734000, China
  • Received:2022-10-24 Published:2024-12-12

Abstract: To development an efficient biocontrol antimicrobial agent of potato dry rot and prolong the shelf of the product, this study utilized Trichoderma harzianum M-17 as the primary research object. Single factor selection and formulation optimization were used to obtain the wettable powder (WP). The optimal formulation of WP was chlamydospore powder (20%), attapulgite (68%) as carrier, sodium dodecyl sulfonate (4%) as wetting agent, sodium carboxylcellulose (7%) as dispersion, and ascorbic acid (1%) as UV protective agent. The chlamydospore content of this WP was 3.1×108 CFU/g, the wetting time was 56.5 s, the spore suspension rate was 82.27%, pH 6.79, the moisture content was 2.26%, the ratio transiting standard test sieve with 74 µm was 98%. All indicators meet the national standards. The results of field experiments showed that T. harzianum M-17 chlamydospore wettable powder could promote the growth of potato plants and indicated a good control effect on potato dry rot, with a control efficacy of 70.32% and a yield increase rate of 19.03%. This study lays a technical foundation for the development of T. harzianum M-17 chlamydospore wettable powder into a microbial fungicide for the control of potato soil-borne diseases.

Key words: Trichoderma harzianum, chlamydospores, carrier, wettable powder, control effect

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