Symptom Identification and Control Methods for Black Spot Disease in Siberian Solomon's Seal

Siberian Solomon's seal (scientific name: Polygonatum sibiricum), also known as: chicken-head Solomon's seal, yellow chicken vegetable, brush-tube vegetable, claw ginseng, tiger ginger, chicken-claw ginseng. It is a plant of the genus Polygonatum, with horizontal rhizomes, cylindrical, with enlarged nodes. Leaves are whorled, sessile. A medicinal plant, it has the effect of tonifying the spleen and moistening the lungs to promote fluid production.

Siberian Solomon's seal has strong adaptability and can withstand severe cold; it can be planted in the south and weakly in the south, prefers shade and moisture, and has strong cold resistance. It grows poorly in dry areas and grows well in moist and shaded environments. It is highly selective about its growing environment, preferring to grow in forest edges, grass clumps or open areas under forests with fertile soil, sufficient surface moisture and strong light transmission in the upper layer. It is not suitable for planting in places with heavy clay, thin soil, drought, waterlogging, low-lying land or many stones.

Siberian Solomon's seal seeds are round-bead shaped, hard, with a distinct hilum, dark brown, and a thousand-grain weight of about 33 g. Seeds stored dry at room temperature have a low germination rate, while seeds stored in low-temperature sand storage and frozen sand storage have a high germination rate, which is beneficial to embryo development, breaking seed dormancy, shortening germination time and achieving uniform germination. The suitable germination temperature for seeds is 25-27 degrees Celsius. At room temperature dry storage, the germination rate is 62%, while mixed with wet sand and stored at 1-7 degrees Celsius, the germination rate is as high as 96%. Therefore, Siberian Solomon's seal seeds must be treated before they can be used for sowing.

Black spot disease of Siberian Solomon's seal

What is black spot disease?

Black spot disease is also called blackspot. It is a common disease of monkshood, aster, cactus, delphinium, elm, Erythronium, Surinam cherry, goldenrod, holly, larkspur, Leucothoe, orchid, primrose, raspberry, rose and beet. It is caused by bacteria of the genus Pseudomonas and many species of fungi in the genera Asterina, Asterinella, Asteroma, Diplotheca, Glomerella, Gnomonia, Microthyriella, Placosphaeria and Stigmea. Infection occurs in humid seasons, producing round or irregular black leaf spots, sometimes occurring on petioles, stems and flowers.

Symptoms of black spot disease in Siberian Solomon's seal:

Black spot disease in Siberian Solomon's seal appears as irregular yellow-brown spots from the leaf tip, with a purplish-red margin at the boundary between diseased and healthy tissue; afterward the spots spread downward and the leaves wither and turn yellow.

Control methods for black spot disease in Siberian Solomon's seal:

Spray with a 1000-fold dilution of 50% Tuzet for control, spraying once every 7-10 days, for 2-3 consecutive sprays.