Screening of Fungicides against Coffee Anthracnose| Chapter 2 | Advances in Colletotrichum Species Causing Coffee Anthracnose in China

 

The indoor virulence of 15 fungicides against Colletotrichum spp. (coffee anthracnose pathogen) was evaluated using the mycelial growth rate method. The results showed that prochloraz, carbendazim, prochloraz-manganese chloride complex, azoxystrobin, and difenoconazole exhibited strong inhibitory effects on mycelial growth, with EC50 values of 0.0358 μg/mL, 0.128 μg/mL, 0.1452 μg/mL, 0.1616 μg/mL, and 0.8367 μg/mL, respectively, all below 1 μg/mL. Moderately effective fungicides included pyrimethanil, thiophanate-methyl, tebuconazole, copper calcium sulfate, and cymoxanil, with EC50 values of 1.8686 μg/mL, 3.4059 μg/mL, 7.4905 μg/mL, 12.4788 μg/mL, and 15.0906 μg/mL, respectively. The least effective were myclobutanil, mancozeb, chlorothalonil, propineb, and iprodione, with EC50 values of 36.4532 μg/mL, 53.3999 μg/mL, 290.0661 μg/mL, 849.7937 μg/mL, and 4400.3908 μg/mL, respectively. Further screening of combined formulations using the four most effective fungicides (prochloraz, carbendazim, azoxystrobin, and difenoconazole) revealed a significant synergistic effect when prochloraz was mixed with difenoconazole. The optimal ratio was 6:4 (prochloraz: difenoconazole, based on EC50 values). Subsequent outdoor pot trials confirmed the enhanced efficacy of this combination, aligning with the indoor screening results. This study provides a theoretical foundation for optimising fungicide combinations to control coffee anthracnose in field applications.

 

 

Author(s) Details

Ying Lu
Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou, China.

 

Jiali Gong
Xuzhou Institute of Agricultural Sciences in Jiangsu Xuhuai Area, Jiangsu, China.

 

Chunping He
Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou, China.

 

Yanqiong Liang
Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou, China.

 

Xing Huang
Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou, China.

 

Kexian Yi
Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou, China.

 

Weihuai Wu
Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou, China.

 

Please see the link:- https://doi.org/10.9734/bpi/mono/978-93-47485-84-8/CH2