Abstract
Lowland arabica coffee can be affected by leaf rust and its decrease the coffee production up to 80%. The resistance level of the plant can be determined by the content of cellulose, lignin, calcium pectate, and polyphenols in leaf tissue. Many publications reported that the mineral element could increase the content of the metabolites. This study aimed to determine the effect of Si, B, I, Ca, and K on the incidence of leaf rust attack. The experiment was carried out at 400 m a.s.l. in 2018. The experimental subjects were KT variety, which was six years old. The experiment used a randomized block design with seven treatments. The results showed that there were 1) decrease the number of leaves affected by rust between first and second observation, and 2) compared to controls, all treatments has decreased the incidence of attacks leaf rust disease. Conclusion: There is a tendency of differences in the incidence rate of attack of leaf rust disease in each treatment. Control plants showed the highest incidence rate of 1.25%, while the lowest incidence was affected by Silica, iodine, and potassium, which were 0.63%. The treatment of silica and iodine was able to reduce the highest number of colonies Leaf Rust.
Highlights
Coffee is the most important agricultural commodity
The plant treated by several mineral elements: calcium (Ca), silica (Si), iodine (I), potassium (K), boron (B), and a combination of all elements
It applied with mist sprayer to the backside of the coffee leaf. 0.5 ml of surfactant Solution added during mineral applications
Summary
Coffee is the most important agricultural commodity. Two main cultivated coffee species are C. canephora (Robusta coffee) and C. arabica. The main of the limiting factor of Arabica coffee (Coffea arabica) production worldwide is Coffee leaf rust [1]. Its biotrophic fungi and the most important fungal disease. The use of fungicides can control the disease efficiently, the economically most favorable alternative is the use of resistant cultivars because it reduces the cost of production and has no negative impact on the environment [2]. The susceptibility of arabica coffee is an important issue due to coffee leaf rust disease. The plant nutrition management can use as an alternative method of reducing coffee rust and other fungal pathogens [7]. This research aimed to know the effect of several mineral éléments like Si, B, I, Ca, and K to plant resistance to the rust disease
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