Agriculture technology: Bacterial mange of tomato
Agriculture technology. Spread in tomato fields, bacterial scab is an infectious disease, particularly damaging. It causes significant drops in yields. The appearance and development of this bacteriosis are favored by climatic conditions, especially an optimal temperature of 25 ° C and a high hygrometry.
Agriculture technology: Pathogen of bacterial mange of tomato
The causative agent of bacterial scabies is Xanthomonas campetsris. The spread of this bacterium is favored by contaminated seeds and plants, sprinkler irrigation , splashing or splashing water resulting from sprinkler irrigation. This pathogen develops when certain conditions prevail, namely excessive nitrogen fertilization, fairly high temperatures and high humidity associated with storms and rains.
Agriculture technology: Symptoms of bacterial mange of tomato
Symptoms of bacterial mange are evident on leaves, stems and fruits. Infected leaves are marked by small translucent lesions on the leaflets and at the edge of the lamina. Over time, brown, circular, angular spots 2 to 3 mm in diameter appear. They are surrounded by a yellowish halo. Under the effect of moisture or precipitation, these spots become dark brown or black with necrosis in the center. The severely contaminated leaves turn yellow, then dry out and fall prematurely.
Similar lesions, including brown spots, also affect the stem, petioles and sepals of the fruit. These lesions are first greasy on the fruits, then appear as corky pustules up to 1 cm in diameter. They are haloed with an oily halo. The appearance of bacterial scab thus results in the putrefaction and rot of the tomato.
Agriculture technology: The fight against bacterial mange of tomato
The fight against bacterial mange requires preventive measures that slow down the spread of the disease or reduce the risk of infection of the plant. These consist in using the disinfected seeds and avoid not only any manipulation of the plants when the fields are wet but also any excess of water on the plants. To do this, it is necessary to space the plants and aerate the crops by avoiding the sprinkler irrigation practices that are conducive to the development of this bacteriose. We must then favor drip irrigation. The removal and disposal of infected plants is strongly recommended to control the spread of bacterial scab.