How should bacterial wilt in sesame be prevented and controlled?
I. Symptom expression Sesame bacterial wilt occurs relatively early. In the early stage of the disease, the roots turn brown, and the top of the plant wilts and droops. Afterward, dark green patches appear on the stem and gradually deepen and turn black. The leaves wilt and droop progressively from top to bottom. Diseased plants are shorter than healthy plants. The vascular bundles of the roots and stems turn brown, and finally the pith becomes hollow. Bacterial fluid oozes out both inside and outside the stem. The leaf vascular bundles are also affected, with dark green streaks on the veins. After the capsules are infected, water-soaked lesions appear and gradually develop into dark brown streaks of uneven thickness.
I. Symptom expression Sesame bacterial wilt occurs relatively early. In the early stage of the disease, the roots turn brown, and the top of the plant wilts and droops. Afterward, dark green patches appear on the stem and gradually deepen and turn black. The leaves wilt and droop progressively from top to bottom. Diseased plants are shorter than healthy plants. The vascular bundles of the roots and stems turn brown, and finally the pith becomes hollow. Bacterial fluid oozes out both inside and outside the stem. The leaf vascular bundles are also affected, with dark green streaks on the veins. After the capsules are infected, water-soaked lesions appear and gradually develop into dark brown streaks of uneven thickness.
II. Prevention and control methods There is still no ideal chemical control agent for sesame bacterial wilt. Agricultural control measures are mostly used, such as rational crop rotation, leveling the land, and rational fertilization.