New Treatment for Ethiopian Coffee Leaf Rust and Ethiopian Coffee Price Characteristics

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Understanding Coffee Leaf Rust Disease

As is well known, coffee leaf rust is caused by the fungus Hemileia Vastatrix. Common symptoms of this coffee tree disease include yellow spots on the leaf surface, which expand into bright orange to red circular patches, eventually turning brown. The underside of leaves shows orange powdery lesions, which are rust fungus spore piles. Infected leaves droop and gradually fall off. For infected coffee plants, both crop yield and quality decline.

Research on Natural Control Methods

According to Beyene Zewdie, an expert from Stockholm University, planting coffee trees in shaded areas can provide a favorable environment for a host that effectively controls the fungal leaf rust pathogen (L. lecanii). "Shade also creates favorable conditions for parasites carrying this fungus (L. lecanii), and we need to maximize this potential."

However, a study conducted in Ethiopia suggests that a organism growing on leaves infected with leaf rust might be the key for coffee farmers to combat this disease. "Leaf rust poses a global challenge to coffee production. Coffee yields are reduced by 30% due to this disease," said Beyene Zewdie, one of the researchers.

Study Findings on Coffee Rust and Parasites

In a study published on May 1st in "Agriculture, Ecosystems and Environment," researchers observed two types of fungi in southwestern Ethiopia from 2017 to 2019: one was the rust fungus causing leaf rust, and the other was a fungus that attacks the rust fungus, named Lecanicillium Lecanii.

Researchers found that coffee leaf rust was more severe during the dry season, while pest infestations were more severe during the rainy season in two of the three years studied. As management intensity of coffee plants increased, leaf rust incidence also increased; when management intensity decreased, parasites became more common. Additionally, coffee leaf rust and pests have slightly different environmental preferences: rust fungi prefer arid environments, while parasites prefer moist, cool environments.

Implications for Coffee Cultivation

This research revealed the relationship between leaf rust fungi and parasites, and has positive implications for future treatment of coffee leaf rust and pest control.

Through this investigation in Ethiopia, it was found that local coffee farmers do not prioritize coffee leaf rust because although leaves on infected plants fall off, they regrow during the next rainy season. Researchers warned that leaf loss has negative effects on plant growth and noted that shade helps mitigate damage. Coffee crops need to grow in the microclimate created by shaded areas. Shade provides a favorable growth environment for parasites carrying anti-leaf rust fungus (L. lecanii). We need to maximize this potential, allowing these two organisms to coexist and thereby suppress coffee leaf rust.

Expert Opinions and Future Directions

Bernard Mukiri Gichimu, a senior lecturer in the Department of Agricultural Resource Management at Embu University in Kenya, stated that this discovery is crucial for coffee farmers. With global climate change, coffee leaf rust will become more destructive, and the discovery of parasites carrying anti-leaf rust fungus (L. lecanii) makes a special contribution to coffee leaf rust control. After all, biological control is better than using fungicides, which are neither safe for consumers nor environmentally friendly.

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