How to treat Coffee Leaf Rust Coffee researchers in Colombia have discovered a new variant of coffee leaf rust

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Leaders of coffee growers in Colombia have urged coffee growers to switch to varieties resistant to leaf rust after discovering a more aggressive new variety of coffee leaf rust (CLR,Coffee Leaf Rust).

The frightening news was discovered by the National Coffee producers Association of Colombia (FNC, Cenicaf é). According to the group, it has identified six new subspecies of leaf rust and nine new destructive varieties of fungi in China.

According to estimates by the Colombian National Coffee producers Association (FNC), about 84% of the acreage in Colombia is planted with coffee trees with leaf rust resistance genes. However, the group warns that resistance to leaf rust does not mean immunity.

Plant pathology researcher Carlos Ariel Á ngel said in a statement in the organization: "like other microbes that live in unfavorable and diverse environments, coffee camel rust can change and mutate in its only host (coffee varieties that are susceptible and resistant to leaf rust). The pressure of this selection and response is a normal dynamic biological process in which fungi try to adapt to survival. As a result, more than 50 mutant subspecies have been identified in the world, while new variants from different countries continue to be identified. "

In view of the popularity of new varieties and subspecies, the National Coffee producers Association of Colombia (FNC) encourages growers to grow coffee varieties that have been proven to be resistant to leaf rust, such as Castillo, Cenicafe 1, Castillo zonales or Tabi and other varieties developed and promoted by FNC and Cenicafe at different times.

The group sees the selection of disease-resistant varieties as a frontline defense against the further spread of leaf rust, which was before the use of fungicides. Since the 2012 leaf rust pandemic, this practice has caused devastating damage to crops in Colombia and throughout Latin America.

The FNC estimates that if no action is taken, the disease will destroy about 30 to 80 per cent of coffee crops.

Coffee leaf rust has been found in most coffee producing countries for at least 150 years. Although great progress has been made in the research on the adaptability of coffee varieties over the past decade, rust continues to emerge, posing a direct threat to the livelihoods of coffee farmers and the supply of Arabica beans.

Recently, coffee leaf rust was first discovered in Hawaii.

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