Symptoms and Control of Polygonatum Leaf spot

Huang Jing, also known as tiger ginger, chicken head ginseng. It is the dried rhizome of Polygonatum polygonatum, Polygonatum polygonatum or Polygonatum polygonatum. According to the differences in the characters of original plants and medicinal materials, Rhizoma Polygonatum can be divided into three types: ginger, chicken head and rhubarb. The original plant of ginger-shaped yellow essence is multi-flowered yellow essence, the original plant of chicken head yellow essence is yellow essence, and the original plant of rhubarb essence (also known as dish-shaped yellow essence) is Yunnan yellow essence. Among the three, the quality of Rhizoma Polygonatum is the best.

Morphological characteristics of Rhizoma Polygonatum

Polygonatum is a perennial herb, the rhizome is horizontal, fleshy, yellowish, the apex sometimes protrudes like a chicken's head, the stem is erect, 50-90 cm high. Leaves verticillate, 4-6 per whorl, linear-lanceolate, 8-15 cm long and 04-1.6 cm wide, apex curled. Flowers axillary, often 2-4 florets, pendulous, total pedicel 1-2 cm long; perianth tubular, white to yellowish, 0.9-1.2 cm long, apex 6-lobed, stamens 6, filaments shorter, 0.5-1 mm long, style 1.5-2 times as long as ovary, berries globose, black at maturity. The flowering period is from May to June and the fruiting period is from July to September.

The main characteristics of Polygonatum polygonatum are as follows: stem 40-100 cm high, leaves alternate, oval, ovate-lanceolate to oblong-lanceolate, 3-5 veins. Pedicel with 2-7 (- 14) flowers, arranged in umbrella shape on total pedicel; perianth yellowish green, 1.8-2.5 cm long; filaments papillose or puberulent, apex dilated to cystic protuberance.

The main characteristics of Polygonatum yunnanensis are as follows: the stem is 1-3 meters high, the top is often twining, the leaves are whorled, 4-8 in each round, the leaves are linear to linear-lanceolate, 6-20 cm long, 0.3-3 cm wide, and the apex acuminate and roll. Pedicels bearing flowers 2-3, not umbellate; perianth pink, 1.8-2.5 cm long, berries red when ripe.

Symptoms and Control of Polygonatum Leaf spot

What is leaf spot?

Leaf spot is one of the most important diseases of muskmelon, which is widely distributed and occurs everywhere, usually in spring and autumn. The incidence rate is 10% to 60%, serious plots or sheds up to 100%, the output can be reduced by 10% to 30%, and in particularly serious cases, the yield can be reduced by more than 60%. The disease can also harm cucumber, wax gourd, towel gourd, balsam pear and other vegetables.

Symptoms of Polygonatum leaf spot

Polygonatum leaf spot disease began to occur from April to May. The damaged leaves first appeared oval or irregular shape from the leaf tip, brown on the outer edge and light white in the middle, which spread downward from the disease spot, causing the leaves to scorch and die. The disease is more serious in the rainy season.

Prevention and control methods of Polygonatum leaf spot disease:

After harvest, ① cleaned the fields, burned the remains of withered branches, and eliminated the pathogen of overwintering.

Before and at the initial stage of the onset of ②, the patients were sprayed with 100 times Bordeaux solution or 1000 times of 50% acetaminophen, once every 7 days and 4 times in succession.