Diseases of coffee trees at low elevations cause kernels to shrink gradually during fruit growth.

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The disease occurred in the low altitude area, so that the kernel gradually shrank in the process of fruit growth, forming a black film, but the appearance of the fruit is very normal. This kind of fruit not only wastes the cost of manual harvest, but also reduces the yield and quality of raw beans. The damage rate can reach more than 80%, and the raw bean becomes a worthless defective bean. Is this problem caused by diseases and insect pests? Or the shadow of the heat? Caused by too much rainfall? Or nutritional deficiency? What if the nutritional deficiency is caused by the lack of that trace element?

In all coffee producing areas in the world, the damage caused by microorganisms is very serious, and disease control is a very important work in coffee garden management. If the disease is not well controlled, the yield and quality will be affected. The main diseases in Taiwan are coffee leaf rust (Leaf Rust, LR), coffee anthracnose (Coffee Berry Disease, CBD), brown leaf disease. The occurrence of the disease varies according to the altitude. Basically, the temperature in the mountain area is relatively cool and cloudy, the damage of coffee leaf rust is very serious, and the damage of coffee anthracnose is relatively mild; with high flat temperature, coffee anthracnose is quite common, and the damage is very serious. And the shadow to the quality of coffee beans, not only make coffee beans into defective beans, brewing out of the coffee taste muddy and with a bad smell.

In the past, coffee cultivation would solve the management of bark beetle diseases and insect pests through the following methods. First, pesticides, which is a conventional method of killing insects, but pesticides are more harmful to the environment. (insecticide killing is no longer advocated); second, people do manual testing by themselves, which is done by growers to detect coffee trees one by one, but this method is more difficult to implement; third, wasps control, through wasps to kill bark beetle adults and hatch larvae on bark beetles, while wasp larvae kill beetle larvae repeatedly to kill insects.

Infate,F. The professors selected 15 hectares of land and divided it into three plots A, B and C, each with 20 spots and 5 coffee trees (some of these coffee trees had diseases and insect pests and some did not). By randomly taking samples (including coffee branches, coffee beans and tree trunks) and using attractants and preservatives, the experimental data show that the two insecticides can kill bark beetles. But it is difficult to apply to the planting of commercial planning on a large scale. This experiment is based on Arabica coffee, but in the course of the experiment, it was found that Robusta coffee was more easily affected by bark beetle diseases and insects.

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