The invention relates to a knitted fabric comprising a first low-extensible area and a second high-extensible area which is seamlessly connected thereto. The pixels of a first filter mask are separated into groups based on luminance. The identifier may be an email address or user identifier. The controller controls the image forming unit so as to form a detection pattern in a detection-pattern region located upstream or downstream, in the second direction, of a region where the image is formed in the recording medium. The method also includes the control of disease in citrus plants caused by vectors such as Psyllid nymphs, by applying the aforementioned composition to their growth habitat in citrus groves.