Spraying Herbmedotcin to withstand black spot (Diplocarpon rosae wolf) of Honey Rosa Rugosa
Honey Rosa Rugosa are of high economic value in agriculture, but they are very susceptible to blackspot disease when growing in a humid environment. The leaves, pedicels and petals will all developed lesions. Brown spots appeared in the early stage of infection and then spread from purple-brown to dark- brown. The shapes of illness are round or irregular, and the diameter is approximately 2 to 15 mm or larger. Eventually, the entire plant begins to weaken and even die.
Black spot disease is a fungal infection that can be spread by wind, water and insects. It is difficult to cure because of spores propagation. Although this disease can be controlled with spraying pesticides, it is necessary to find a safe and edible therapeutic method to prevent the disease.
This experiment is divided into two groups:
1. Control group: Spray normal water.
2. Experimental group: Spray water with Herbmedotcin
Partially infected leaves appeared at the beginning of the experiment. The infection continues during the first week. The infection alleviated during the second week and new leaves (light green and reddish leaves) began to grow. The situation which enhances the growth of the leaves continued in the third and the fourth week, and then most plants began to grow buds and bloom.
In the same way, the infection occurred at the beginning of the experiment. The infection continues during the 4 weeks. Although the plant grew some new leaves in the 3rd week, the control group did not grow any bud after 4 weeks of culture. (Figure 1)
In the first week of the trial, some leaves of the control group were infected with black spot disease (red arrow). Although the diseased leaves were found and removed, the infection continued to the fourth week. The problem worsens, and the leaves turn yellow. In the experimental group, some leaves were infected with black spot disease during the first week of the experiment, and the infected leaves were also removed. By the fourth week, the leaves were no longer infected and new leaves were grown (Figure 2)
Therefore, remove the diseased leaves cannot effectively solve the problem (Figure 1). Besides, the yellow leaves and the unhealthy plants, the black spot disease may affect the formation of buds (Figure 2). Farmers can apply Herbmedotcin in the plant to reduce the occurrence and spread of black spot disease. It can also increase plant health, promote the formation of new leaves and buds, reduce disease risk, and increase yield.