One of the living things that is considered dirty and cause various diseases is a fly. Indeed, animals created by Allah Ta'ala is often perch in a place that dirty and germicidal. Nevertheless, flies include animals mentioned in the Qur'an or hadith.

Then is there a huge benefit until the fly is mentioned in the holy book? Or is there any wisdom behind his creation?

Disorders of plants caused by viruses, bacteria, and fungi are called diseases. Unlike pests, diseases do not eat plants, but they damage plants by interfering with the processes in the plant body to kill plants. Therefore, plants affected by the disease, generally, the body part intact. However, his life activity is disrupted and can lead to death. To eradicate pests and diseases, people often use oat - pesticide medicines. Pesticides used to kill insects are called insecticides. The pesticide used to eradicate the fungus is called a function.