[Symptoms] At the beginning of the disease, the leaves appear purple-brown dots and later expand into nearly round black-brown spots. The edges often have a radial yellow halo. In severe cases, the lesions are connected and the leaves wither and fall off. In particular, a large number of fallen leaves are formed in summer and fall. After the shoots were infested, black-brown streaks appeared, which caused the shoots to die.
[Pathogen and Pathogenesis] The pathogen is Marssonina (Actinonema) rosae (Lib.) Sutton, which belongs to the subphylum Aspergillus spp., Laminaria sp. The fungus also invades roses, roses, yellow thorn roses and so on. The wintering of the diseased body with mycelium and conidium discs. In the spring of the following year, conidia were produced and spread by wind and rain. The number of spring rains was closely related to the severity of the disease. In the middle of May, there were sporadic cases in Hebei Province. The disease began in the middle and early June. After that, the disease gradually increased. The disease gradually entered the peak period in mid-August. The disease condition gradually declined in September and entered the end. Multiple infections can be repeated throughout the growing season. . The pathogenic germination invading temperature is 20-25°C, and it is heavy in wet, poor management and debilitating plant conditions. With dewdrops and moderate temperature, the spores can germinate and invade within 6-10 hours, and show symptoms within 3-6 days.
[Integrated prevention]
(1) Detoxification source timely remove litter, reduce the source of infection, do a good job in field health is an effective measure to control the occurrence and development of the disease.
(2) Strengthen conservation, such as rational fertilization, pay attention to pruning, without spraying to increase growth potential.
(3) Selection of disease-resistant varieties such as strawberry ice cream, queen, horseshoe, double floribunda, etc.
(4) Chemicals control and control 100% liquid lime sulfur spray before germination, eliminate the source of sterilization. June spray protection, such as the use of 75% chlorothalonil WP 800-1000 times, or 52% chlorpromone WP 500-800 times liquid control.
Glutamic acid, is an acidic amino
acid. Molecules containing two carboxyl groups, chemical name for
α-amino-pentanedioic acid. Glutamic acid was discovered by lisuoxun in 1856, is
a colorless Crystal, fresh, slightly soluble in water, soluble in hydrochloric
acid, isoelectric point 3.22. Abound in cereal protein, animal content in the
brain and more. Glutamic acid in vivo protein metabolism plays an important
role in the process, participating in many important chemical reactions in
animals, plants and micro-organisms. Msg containing small amounts of glutamic
acid.
Function:
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conditions of human skin.
2.Increasing the elasticity of human skin and keeping it tight and
smooth.
3.Inhibiting the formation of melanin remarkably.
4.Keeping pH balance of human skin.
5.Forming a slow-release delivery system and therefore improving the
absorption capacity of nutrients in cosmetics.
6.As a humectant, moisturizer to improve skin care quality, as a
whitening agent, has anti wrinkle property which gives long lasting effect.
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