The grass rust disease is harmful to the stems and leaves of barnyardgrass. In severe cases, the leaves of the whole plant will die, and the buds will wither and fall, which will affect the ornamental.
symptom
At the beginning of the disease, faint yellow patches were scattered on the leaves and stems. After the plaques ruptured, yellow-brown sac was dispersed and sometimes the entire leaf turned yellow. In the later period, the diseased department produced black spots that were closely lined with ovals.
Rubella rust is caused by a fungal infection of the genus Puccinia, mostly wintering in diseased tissues. Every year from June to July is serious. Planting too dense, high humidity, poor soil viscosity, excessive use of nitrogen fertilizer, etc., are easy to induce the disease.
Control methods
The first is to strengthen the cultivation and management measures to maintain proper spacing, in order to facilitate ventilation, avoid planting in low-lying wet areas, and pay attention to less nitrogen fertilizer.
The second is to remove the diseased plants in time and focus on burning them.
The third is chemical control. It can be sprayed at the onset of Baume 0.3 to 0.5 degrees lime sulfur or 80% dexamethasone WP 500 times 20% Triadimefon EC 4000 times and other agents, spray once every 10 to 15 days, even spray 2 ~ 3 times.
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