Planting vegetables, the seedling stage is a critical period, what are the main diseases of vegetabl

For example, cataplexy, blight, gray mold, blight, root disease, these diseases are very easy to appear.

For example, wilt, rust, blight, gray mold, leaf blight. These diseases are very likely.

Cataplexy , which is relatively common, occurs around the time of emergence and needs to be prevented in advance.

<> the pests that harm the seedling stage of vegetables mainly include ground tigers, grubs, mole crickets, root maggots, etc.

The tiger mainly harms the seedlings of Solanaceae, Cucurbitaceae, Fabaceae and Cruciferous vegetables, and also feeds on a variety of weeds. The seedlings are bitten off from the base of the rhizome surface, or bite the seedlings cotyledons and young leaves, often causing the lack of seedlings, broken ridges or continuous death. The larvae can also burrow into the leaf bulbs of Solanaceae and Cucurbitaceae fruits, or cabbage, biting the fruits or leaf bulbs into cavities, and excreting feces inside, causing rot.

Grub is the common name of beetle larvae, commonly known as white soil silkworm, white ground silkworm, can harm eggplant fruits, melons, beans, leafy vegetables, etc. When feeding, the underground roots and stems of seedlings are bitten off, resulting in the death of the whole plant, and in severe cases, the lack of seedlings and broken ridges are caused. or gnaw on roots and tubers, weakening crop growth and affecting yield and quality.

The neat incision of the victim site is its hazard characteristic. Adults, also known as copper klang and blind bumper, can feed on the leaves, petals and shoots of a variety of plants.

Mole crickets, also known as lala crickets, soil dogs, etc., are omnivorous pests, and both adults and nymphs can be harmed. In addition to biting on freshly sown seeds (especially freshly sprouted seeds), young roots and young stems are also eaten in the soil. When drilling in the soil, the seedling roots can be cut off, and the tunnel often makes the seeds overhead or causes hanging roots, so that the seeds can not germinate or lose water and the orange dies, resulting in lack of seedlings and broken ridges.

The disorganized hemp of the damaged part of the rhizome is its identification characteristic.

Root maggots can harm a variety of vegetables. Harm seeds, feed on endosperm or cotyledons, cause bud rot, and fail to emerge; If the seedlings are harmed, they will be eaten upwards from the base of the rhizome, causing the plants to wither and die; If insects eat the adult plant, the plant will not grow well, causing the base of the rhizome to rot or die.

After <> the seedlings were slowed down, the growth of seedlings gradually accelerated with the recovery and enhancement of physiological functions and the gradual increase of external temperature. When the seedlings are raised in early spring, the outside temperature is relatively low on some days when the seedlings are just slow, and the seedlings do not grow fast, and the seedbed management is still mainly based on cold protection and heat preservation.

After the seedlings enter the rapid growth stage, in principle, the temperature is controlled without water under the condition of ensuring sufficient nutrient area, which not only prevents the seedlings from growing, but also ensures the normal growth of the seedlings. The so-called temperature control is mainly to control the night temperature, the low night temperature can promote the accumulation of photosynthetic products, so that the seedlings grow robustly, and the flower buds of fruits and vegetables are well differentiated, which is conducive to the differentiation of female flowers. Reducing the night temperature also makes the flower bud differentiation of vegetables better, which is conducive to the differentiation of female flowers.

There should also be a limit to reducing the night temperature, and the temperature-loving fruits and vegetables should not be lower than L0, otherwise it will affect the differentiation and development of flower buds, and tomatoes are prone to multi-ventricular malformation fruits; Cabbage, celery, etc. can not be maintained for a long period of time below 4-5 low temperature, otherwise, it is easy to cause unripe sprouts.

Temperature regulation is mainly achieved by daytime wind and night coverage, as the outside temperature rises, the greenhouse and the cold bed of the wind time is gradually extended, and the air volume is gradually increased: whether it is a greenhouse or an arch shed, the top wind should be mainly released in the low temperature period, and the seedlings are easily harmed by the premature bottom wind. It is necessary to maintain the cleanliness and light transmittance of the transparent covering, and prolong the light time of the seedlings as much as possible, so as to enhance the light intensity of the seedlings and lay a good nutritional foundation for the healthy growth of the seedlings.

When the seedlings are short of water, should be selected to be watered thoroughly in the morning on a sunny day, and at the same time let the wind and reduce humidity, when there is no water beads on the seedlings, sprinkle a layer of fine soil, or watering the next day after the soil surface is slightly dry with a small hook or bamboo skewer to loosen the soil, can play a role in maintaining the moisture of the bed soil and reducing the number of watering.

In the seedling period of water management to oppose drought squatting seedlings, two to oppose small water watering, if the use of container seedlings, when conditions permit, with the seedlings grow up appropriate to open the container distance, which has a significant effect on cultivating strong seedlings and preventing growth. After entering the vigorous growth stage of seedlings, if there are symptoms of lack of fertilizer or insufficient nutrients in the bed soil, you can top dressing and watering 1-2 times with an aqueous solution composed of urea or potassium dihydrogen phosphate.