What disease is strawberry stem red?

Hello, first of all, physiological function stems are red.

1, high temperature, low temperature

Strawberry is a light-loving plant, but its shade tolerance is very strong, so the temperature and light of strawberry must be controlled reasonably during planting. The optimum temperature for strawberry growth is 18-25 degrees, and the suitable temperature at night is 12- 15 degrees. The temperature below -5 degrees will basically freeze to death, and the temperature above 30 degrees will inhibit growth!

For strawberry stem redness caused by high temperature, the main reason is that the optimum temperature of leaf photosynthesis is 20 ~ 25℃, and above 30℃, photosynthesis decreases. The growth of strawberry is inhibited, no new leaves are produced, and the old leaves are burnt or scorched. In order to resist high temperature, leaves may produce anthocyanins and turn red. So you can use a sunshade net or a cover to reduce the temperature and light!

Lack of nutrition hinders nutrition.

Strawberry is a fertilizer-loving plant, and the demand for fertilizer varies with the growth period, but the basic fertilizer should be applied at one time. However, in the process of strawberry planting, we should not only pay attention to a large number of elements, but also pay attention to the application of microbial organic fertilizer, which can better improve the stress resistance of strawberries and help improve the quality of strawberries.

Soil problems, herbicide residues

Strawberry cultivation also needs higher soil. Strawberries like to grow in fertile, loose, neutral or slightly acidic loam. Too sticky soil is not suitable for farming. Poor soil conditions will hinder root respiration, and obstacles to nutrient absorption will cause stem redness. In particular, the soil is hard and airtight, which affects root respiration. If the seedlings are too dry, the stems will turn red without absorbing nutrients. In addition, if the soil moisture is too high, or the root respiration is blocked due to long-term water accumulation, or the root rot and the root absorption capacity are reduced, the stem will be red.

At this time, it is suggested that growers choose fields, drip irrigation and apply water-soluble fertilizers to the sea to improve root activity. Only when the soil is fertile and the roots of strawberries grow well can the yield of strawberries be improved! First of all, let the roots have a better growth environment, that is, the soil is better, and our strawberry greenhouse is often extremely unreasonable because of planting strawberries all the year round, and the soil will have serious problems such as acidification, salinization and hardening! Humic acid is a sharp weapon to improve soil aggregate structure, enhance air permeability, buffer soil PH value and take root and sprout!

As for the phytotoxicity caused by herbicide residues, strawberry stems are red, which is mainly the phytotoxicity to the roots, leading to the problem of dead seedlings. The cells have been broken and damaged, and the seedlings that are completely dead can only be pulled out. Those with slight growth began to turn yellow, recovered quickly, and poured a lot of water to reduce the concentration. At the same time, it is necessary to promote cell division and regeneration, pay attention to the supplement of phosphorus, zinc and calcium, apply micro-supplement energy underground, and spray micro-supplement force on leaves quickly to alleviate the problem of phytotoxicity and promote the recovery of strawberries.

Second, pathological.

1, anthrax

Strawberry anthracnose can cause some lesions on leaves or stolons or the whole plant withers and dies; Stolons and petioles began to turn red. In severe cases, ulcer-like, slightly depressed lesions will be slightly depressed, but the color is often dark brown. With the enlargement of the lesion, the center changes from dark brown to grayish white, and the edge is dark brown or dark green. Dark brown spots appear on the lesions, and pink colloidal mucus appears on the black spots when wet.

Red stele root rot

For root rot, if you send a field without root soaking treatment, it will generally happen more seriously! Root rot is the most harmful to rhizomes, the plants are precocious, the rhizomes turn brown, the plants wither and die quickly, and the columns are dark red when the roots are cut open. Petiole suffers from intermittent dark red or dark brown, and white mold can grow in wet weather;

3. Gray mold

For strawberry botrytis cinerea, botrytis cinerea is a typical disease with low temperature and high humidity. The onset temperature is 18 ~ 23℃, and the relative humidity of air is above 90%. Especially after continuous rainy weather, the disease is very popular. Therefore, strawberry is prone to gray mold when the humidity is too high when flowering, which leads to red flower branches. At first, red flowers will appear, then the calyx will turn red, and young fruits will also be affected. When the disease is serious, the bud, flower and receptacle are all infected, and the bud cannot open and the receptacle cannot develop.

By comparison, we can find the reason:

1. Strawberries with red stems are all bad roots, do not spit out new leaves, grow slowly and vary in size.

2. The management of fertilizer and water in the early stage can't keep up with the root irrigation treatment after strawberry planting, and the strawberries grow evenly and have thick stems.

3. Too wet flowering period causes the harm of gray mold, and also makes the flower branches turn red. At first, the flowers will turn red, then the calyx will turn red, and then the young fruits will be affected.

4, the wrong choice of pesticides, soil hardening, herbicide residues and other reasons.