The main diseases and insect pests of Polygonatum odoratum are leaf spot (yellow and withered leaves), root rot (rotten roots), gray spot (dead leaves), purple wheel (gray brown lesions of leaves), etc. Next, I will explain the causes and control methods of these diseases and insect pests in detail with you!
Leaf spot is a kind of fungal disease, which affects the leaves of Polygonatum odoratum. It makes the tip of the leaves appear ellipse or irregular shape, the edge is purple red, the middle part appears brown spots, and finally causes the leaves to wither and die. This situation often occurs in summer and autumn, and the incidence is high in rainy season.
Attention should be paid to keep the planting environment healthy, and the damaged leaves and dead branches should be burned intensively to eliminate the overwintering pathogens.
In the early stage of leaf spot disease, Bordeaux solution can be used for sterilization, with the proportion of 1:1:120. Or use a 1000 fold solution of bacteriophage (50%) and spray it every 10 days for 2-3 times.
The root rot of Polygonatum odoratum mainly occurred in the round light brown lesion spots on the rhizome and gradually rotted, which seriously affected the output and quality of Polygonatum odoratum and its later transplanting. The main reason is caused by the pathogen (a pathogen of Fusarium), which will overwinter in the soil and infect the root. It is a very common disease and insect pest of Yuzhu!
Use medicine to irrigate the root in the early stage of disease: it is recommended to use carbendazim (50%) 500 times solution for root sterilization.
For Yuzhu, which is already "terminally ill", it is suggested to remove it and disinfect the soil thoroughly with medicament
Similar to leaf spot, it is also a bacterial disease. At the early stage of the disease, the surface of the leaves of Polygonatum odoratum will form round (purple edge and gray Center) lesions. In the vein part of the leaf, there will also be strip spots, which will lead to the death of the leaf seriously. This kind of lesion is more common in summer, and most in June to July.
Use chlorothalonil 500 times solution for sterilization, spray every 6-7 days, lasting about 3 times.
Lucky Bamboo is a kind of leaf disease. There are oval spots on both sides of the leaf, with a diameter of 2-5cm.
The first spot is red, and gradually turns gray brown. It is a disease caused by fungi (seminiflora, Botrytis macrostemona). It is latent in winter and spreads through airflow with the temperature rising. The common incidence period is from June to July.
Do a good job in planting environmental sanitation, remove the diseased leaves in time when it is found at the initial stage; thoroughly clean up and deal with (burn or deep burying) the plants after dying.
