What are the dangers of small bridgeworms to asparagus? What should I do?

Asparagus, also known as stone caocypress, is planted once and harvested continuously for 15 to 20 years. Its tender stem texture is delicate, the fiber is soft and delicious, the taste is fragrant, contains a large number of amino acids and a variety of vitamins, and can be eaten fresh and processed in cans. The first is germination, the seed shell of asparagus is relatively hard, and the germination will be slow if it is sown directly, and if it is not properly managed, it will cause the seedling rate to decline, so we must first promote germination, change the water once a day in the morning and evening, and generally soak for 3-5 days.

Asparagus is a perennial root crop that is popular for its nutritious stems and good taste.

<> asparagus can be harvested continuously for about 20 years at a time, so you must choose a good plot before planting and be prepared to fight a "protracted battle". Asparagus is a perennial herbaceous plant with fleshy roots, and the stems are divided into above-ground and underground stems. The above-ground stems wither in winter and the underground stems sleep in the soil for overwintering, and the underground stems draw tender stems for food in the spring.

The growth point of the center of the underground stem of the adult plant is now cultivated in all countries of the world, and it enjoys the reputation of "the king of vegetables" in the international market. Among them, China, the United States, Europe and Japan are the main production areas of asparagus. In temperate regions, the Yangtze River and the Yellow River Basin, very suitable for the growth of asparagus asparagus is a perennial root plant, as long as it is planted once, it can basically be harvested for more than ten years, plus asparagus has a strong adaptability, both high temperature resistance, but also cold resistance, and there is no pests and diseases, so it can be regarded as a veritable "lazy asparagus is a nutritious vegetable, many people like to eat asparagus, you can make fried asparagus, asparagus fried meat, cold asparagus and so on.

In recent years, the cultivation of asparagus has also increased, especially since many asparagus are exported overseas. How should asparagus be grown? Farmers always consider the cultivation of asparagus around soil, fertilizer, water, seeding, etc., but planting asparagus has a certain difference from general vegetables or crops, that is, planting asparagus is a sowing, seedling, transplanting, planting to the field can be harvested more than ten in a row.

It will cause the yield of asparagus to decrease, and there will also be some spots of the problem, which will also affect the growth and development of asparagus, we should spray some pesticides to prevent pests and diseases.

The small bridge-building insect is also called the small bridge-building armyworm, cotton armyworm, cotton small bridge-building worm, Buqu, with 1 2 instar larvae only feed on mesophyll, residual epidermis, 3 4 instar larvae will eat cotton leaves into a nick, 5 6 instar larvae can bite the leaf veins. When pruning and plucking the lower old leaves, the removed old leaves and branches are taken out of the field to prevent the removed larvae from continuing to cause damage in the cotton field. In cotton fields where small cotton bridgeworms occur severely, dead branches and leaves should be removed after the cotton pole is plucked, and burned in a concentrated manner to kill the overwintering pupa.

Adult insects are trapped, either with a black light or a high-pressure mercury lamp. In the season of small bridge-building insects, 8 10 leafy branches such as poplar branches or willows, black locusts, purple locusts, acacias, etc., are bundled together, tied tightly, and stand upside down in the field, so that the branches are slightly higher than the cotton plants, and 150 225 are scattered per hectare, and the branches are covered with plastic bags every morning and beaten, so that the moths enter the bag for killing. Branches should be replaced in time after they are too dry.

The small bridge-building insect is also called the small bridge-building armyworm, cotton armyworm, etc., with the 1 2 instar larvae only feed on the mesophyll, the residual epidermis, the 3 4 instar larvae will eat the cotton leaves into a notch, and the 5 6 instar larvae can bite the leaf veins. Methods of prevention and control:1

When pruning and removing the lower old leaves, the removed old leaves and branches are taken out of the field to prevent the removed larvae from continuing to cause damage. 2.Adult insects are trapped, either with a black light or a high-pressure mercury lamp.

3.Prevention and treatment with pesticides in the middle and late stages. Spray regularly to kill pests.

It will cause asparagus death, reduce yield, and affect future asparagus planting. At the time of sowing, it is necessary to remove debris from the field, and to add pesticides regularly to kill pests.

First of all, it will affect the normal growth of asparagus, and it will also make the quality and yield particularly low, so at this time, it must be cleaned up in time, sprayed with pesticides, and then watered and loosened the soil more.

The harm is still very great, in fact, for plants, this insect will eat plants, and will eat the asparagus of this plant cleanly, and generally will directly choose suitable chemicals.

Asparagus rust: It is caused by rust fungus infection in fungi, mainly affecting leaves and twigs. In the early stages of the disease, yellow or orange-red, slightly raised small spots are produced, and the epidermis breaks down and emits a reddish-yellow powder.

Late growth or in autumn and winter. Stem blight often overwinters in diseased tissues with the conidia of the pathogen, and the conidia are scattered in the next spring to invade the young stems, and spread rapidly under warm and rainy conditions. In Shandong Province, it generally begins in early May, and the incidence rate can reach 12% in early July.

<> aphids and thrips use adults and nymphs to suck sap from young stems, twigs, and leaves, causing the branches and leaves to turn yellow or lose green, resulting in premature plant aging. The affected young stems wilt or their growth is inhibited. You can sprinkle 25 trichlorfon powder and 5 times the fine soil in the field to make poisonous soil; or mix 30 times the liquid of 90 trichlorfon on wheat or bean cakes, and withdraw them in the field to make poisonous bait; When fertilizing, spray 80 times of dichlorvos emulsion 800 times and other methods to prevent and control.

After clearing the garden, young stems should be sprayed to prevent stem wilt as they grow, and should continue until the stems and leaves age. Drugs are often used alternately, and a single drug is not used for a long time, so as not to develop drug resistance and affect the efficacy. Mole crickets are stirred with 30 times of 90% trichlorfon, add an appropriate amount of water, mix the tide as a degree, apply kilograms per mu, and sprinkle the best effect in the windless and sultry evening.

1 kg of 3% phosphine granules, 3 kg of fine sand and sprinkled in the seedbed.

The temperature suitable for seed germination of asparagus is 25 30, and the germination rate and germination potential of asparagus are significantly decreased if it is higher than 30. The most suitable temperature for shoot formation is 15 17, above 25 the buds are weak and the scales are scattered. Asparagus is suitable for living in loose and fertile soil, and try to make the soil more breathable. The soil layer must be deep, which is conducive to the development of roots and young stems.

The sowing selection is better in the spring when the growth is vigorous, and the low temperature is relatively high after the frost period, which is conducive to budding. In terms of fertilization, it is necessary to top dressing in time during the growth of asparagus, and timely supplement nutrients such as nitrogen, phosphorus, and potassium fertilizers.

Aphids, needleworms, often inject insecticides to ensure the high-quality growth of asparagus, give asparagus proper insecticide and weeding, transplant new seedlings, and add fertilizer about once every two months.

1.Spodoptera exigua-like pests include Spodoptera litura, Spodoptera exigua, Spodoptera exigua, etc., and the damage period is June to September. Its larvae are diurnal and nocturnal and feign death.

Young larvae feed on young branches, young leaves, and epidermis. Adult larvae eat a lot of food, have gluttony, in addition to biting on leaves and shoots, but also hurt young stems, gnaw on the epidermis of old stems, resulting in reduced yield. Prevention and control methods:

To trap adult insects, you can use black light or sweet and sour solution to trap them; Pesticide control should be sprayed when the first instar larvae are not dispersed or not hidden, and the resistance to pesticides is very strong after adulthood, and it is often difficult to kill. Generally, according to **, 4 to 5 days after the peak of spawning, the spraying effect is better. Spraying in the evening is better than during the day, and the agents that can be used are:

90% trichlorfon crystal 1000 times, 40% Lesben 1000 times, 5% Taibao 1000 times, new high lipid film powder.

Insect pests commonly encountered in asparagus cultivation include noctuidae pests, aphids and thrips, which eat the young leaves and shoots of asparagus, affecting and inhibiting the growth of asparagus and reducing yield. The prevention and control methods include cleaning the field and weeding frequently. timely irrigation; To trap adult insects, you can use black light or sweet and sour solution to trap them; Pesticide control should be sprayed when the first instar larvae are not dispersed or have not been hidden.

Noctuidae pests: You can choose to trap adult insects, which can be booby-trapped with black light or sweet and sour solution.

Aphids, thrips are adults, nymphs: clean the field and weed.