Butterflies are a very common insect pest in coriander planting, what harm does it do to coriander?

In the process of coriander planting, the butterfly is very harmful to the coriander, which will make the leaves of the coriander be eaten away, and finally only the bamboo wheat and petioles will be left. Therefore, if you want to control this pest, you need to eradicate weeds in and around the field after winter, so as to reduce overwintering pupa. At the same time, it is also necessary to combine field management and manually kill these larvae.

When the number of larvae is small, it can be combined with the control of other pests, and when there are more larvae, special drugs need to be used for control. The butterfly is to use the larvae to mutilate the leaves, and feed at the same time as the nocturnal activity, if you do not do a good job of prevention and control, then the harm to coriander will continue to increase. <>

At the same time, we all know that coriander is a very important green food in the vegetable market, and its fragrance is welcomed by many residents and the catering industry. There are planting areas in all major provinces, and there are also many greenhouse growers. In the process of coriander export, if there are no control measures, then it will be spoiled by insect infestations.

Moreover, in the process of planting, coriander will not only encounter insect pests such as butterflies, but also soft rot, black rot, etc., most of which are caused by white moths or mealy moths. <>

Take measures because the fragrance of coriander itself will be attacked by some insects with bacterial powder, and these insects will cause great damage to the leaves and roots of coriander. If growers do not take measures in advance, the infectious disease will eventually appear in a large area of coriander, and it will not be conducive to the continuous increase of production. In the process of insect infestation, growers must carry out certain measures on spraying pesticides, such as spraying once a week or spraying 3 or 4 times a month.

Pesticide spraying & fumigation and in the early stage of the disease, you can also choose Suclin, with soluble stone powder, to spray pesticides on the affected area. After spraying continuously for a month or so, this symptom gradually decreases, and if the grower grows the coriander in a greenhouse, it can be smoked.

It may make the coriander not grow so well, and it will be gnawed bald, and the growth will also have a great impact, and there may be some other pests and diseases, and it will die.

It will affect the yield of coriander, so that the coriander will be seriously harmed, which will cause the coriander to wilt and disease, and there is no way to grow normally, so that farmers will suffer very serious property losses.

It will cause the coriander to wilt slowly, and it will also be infected.

And then it will also cause the yield of coriander to become lower and lower, which will then cause our losses.

And the coriander will also have some spots on the body surface, which is no longer as delicious as before.

Butterflies use larvae to bite on leaves, resulting in notches or only the main vein and petiole remaining. Nocturnal activity feeding, when touched, can protrude from the chest and ooze odorous fluid. Severely affects growth and reduces yield.

Adults are yellow, 24-32 mm long, and the dorsal ridge is black with broad longitudinal stripes; The fore and hind wings have black and yellow markings, and the hind wings have blue markings on the proximal outer margin and a red spot near the hind margin. Ovophyte. Mature larvae are 52-55 mm long, green, with black longitudinal stripes on the head and short black transverse markings on the dorsal surface of the thorax and abdomen.

The pupae are yellowish-brown with stripes and 2 angular protrusions on the head.

Although coriander is not very selective to the natural environment, it can cause corresponding pests and diseases in the process of rain, irrigation and insect migration. Drugs such as carbendazim, sclerotium, methyl tobuzin and manganese octane potassium are commonly used drugs for the prevention and control of coriander pests and diseases, and it is also necessary to regulate soil moisture and humidity. Such as sclerotinia sclerotinia disease, leaf blight, root rot, etc., strengthening crop rotation will greatly reduce the occurrence of diseases.

Drug prevention and control can choose low-toxicity pesticides such as ammonium dyssen, zecze, Bordeaux liquid, chlorothalonil, carbendazim, and oxazin.

Coriander is an adaptable vegetable, it is not strict with soil requirements, and it can be grown in general soil. However, the soil is loose, the soil layer is deep, rich in organic matter, and the plots with strong water and fertilizer retention are more conducive to its growth. Before raking the ground, apply some farm fertilizer, and then rake it flat and fine, and make furrows.

Tea yellow mite and red spider also suck the juice of coriander, causing plant deformity and slow growth, small and hard leaves, yellowing of the back of the leaves, rolling down the leaf margins, dying at the growth point, and no new leaves. Tea yellow mites reproduce quickly. For the prevention and control of this insect, drugs are mainly used, such as avermectin, liuyangmycin, etc.

Aphids are also the main culprits of coriander virus disease, so they should be used to control coriander seedlings when they are leaves, which can be carried out once every 7-10 days, 2-3 times in a row, which can effectively reduce the spread of aphids and reduce the occurrence of coriander virus disease. Growers who specialize in growing coriander on a large scale will use some chemical agents to control this pest. For example, use:

Spray 5000 times of 10% acetamiprid, or 4000 times of 50% pymetrozine EC to treat the infested coriander. If coriander is grown in greenhouses, there are also smoking aphid cocoon wasps to control this aphid.

The prevention and control of aphids is mainly prevention, and the main measures include timely removal of weeds and deep ploughing of the land. Coriander is a shallow-rooted leafy vegetable, the root system is not developed enough, and the ability to absorb fertilizer and water is relatively weak; Coriander needs more water to grow, that is, it likes water, but its ability to tolerate drought and waterlogging is relatively poor, and the soil that needs to grow is relatively fertile and has good air permeability.

Prevention and treatment through drugs. You can spray some pesticides inside the coriander, which can kill some pests.

The first disease is called "sclerotinia sclerotiorum". **For this disease, the soil must first be disinfected. Then, we have to spray a thousand times the sclerotinia once, and then spray again after ten days, about the third time around the beginning of spring.

In addition, it is necessary to pay attention to environmental control, such as strengthening ventilation and so on, which have a good effect on reducing diseases.

The second is "leaf blight", which we can also see from the name that it is the leaf that harms it. Once the disease occurs, it spreads very quickly, so the damage caused is also large. When the leaves are infected, they turn yellowish-brown, and if the temperature is too high, it will cause widespread decay.

To deal with this disease, we can use carbendazim 600 to 800 times the agent to prevent and treat it. There is also to strengthen management, such as paying attention to ventilation, controlling the amount of watering, and so on.

Be sure to spray some pesticides in time, so that you can kill a lot of pests and diseases. And the effect of these pesticides is also very good, and it will not affect the quality of coriander.

Whitefly is familiar to everyone, a disgusting little white moth, hidden on the back of crop leaves when harmed, sucking the juice of coriander with stinging and sucking mouthparts, often causing the leaves to fade green, yellow, plant growth weak, wilting, its secreted feces are sticky, easy to cause coal pollution disease This sentence can also be said to be reliable, at least the coriander planted sporadically in my family rarely carries out pest control, in fact, there is less pest occurrence of vegetables than coriander, such as garlic, lettuce and other vegetables are vegetables with less insect pests, So these are also vegetables that are grown more.

It can induce the leaves of crops to form mildew and lose photosynthesis, and the leaves of plants can only wither and die after losing their metabolic function. At the same time, when it eats crops, it can also spread viral diseases and other diseases, so aphids are a major killer of crops, and coriander is not immune. Golden butterfly, also known as yellow butterfly, fennel butterfly, etc., is a lepidopteran pest.

This kind of pest adult is very beautiful, and is known as the "insect artist", but this "artist" is also not soft when harming coriander, and the main harm is the larvae of the golden butterfly.

In terms of control, you can use plant ash to control aphids, and the simple method can be sprinkled directly, and it can be used 2-3 times in a row, every three days; Of course, the plant ash is too powdery, and it is easy to fall off when the wind blows, so you can sprinkle some water on the coriander first and then apply the plant ash to make it easy to stick.

Prefer loam or clay loam soils that are rich in organic matter and have strong water and fertility retention. Nitrogen and phosphorus deficiency in the early stage of growth and nitrogen deficiency and addition in the later stage have a great impact on its yield, so in the fertilization of coriander, the management of nitrogen and phosphorus in the early stage of growth should be strengthened, and the management of nitrogen and potassium fertilizer should be strengthened in the later stage of growth. Extensive planting can lead to high yields and bumper harvests.

Coriander is a warm-loving and shade-tolerant crop, which can survive in low temperature and high temperature environments, but the most suitable temperature for its growth and development is still 17 20, and to achieve high yield, it is necessary to first choose a suitable soil and pay attention to temperature and humidity regulation and control.

It's a kind of insect with a black and white pattern, which looks particularly ugly, and it can also affect the growth of coriander.

Coriander butterfly, it is also a harmful disease. In the case of this bug, it is yellow in size, about 30 mm. Wings are patterned and feed on some leaves. Slowly it will take the plant. After eating, some meridians are left.

In fact, it is a pest of coriander, which will cause the yield of coriander to be reduced, and will affect the normal growth environment of coriander.

Be sure to kill the larvae by hand before spraying them with a special agent. At the same time, it is also necessary to do a good job of drainage and irrigation, and be sure to eradicate some weeds and hosts that can parasitize them in the field.

First of all, it is necessary to use pesticides in time, and it is necessary to choose the appropriate planting and management system, and it is necessary to water at ordinary times, to choose the right fertilizer, to ensure that the sun is exposed, and to raise seedlings in advance.

The method of chemical control is adopted, because such a disease has appeared, so it can only be carried out by chemical drugs to achieve the best control effect.

Coriander is no stranger to everyone, and it is a common side dish in the diet. Some people may not be able to accept the unique aroma of coriander, but those who love to eat it cannot stop eating it because of this unique aroma and cannot do without it almost every day.

1.Coriander sclerotinia sclerotiorum

The disease is very common in the country, with a prevalence of more than half of the cases, because mycorrhizal sclerotia can persist in the soil for a long time, and greenhouses provide favorable conditions for the reproduction of this disease. The disease can occur throughout the growing season and affects the coriander root, spreading upward.

measures: To prevent this disease, you should practice crop rotation or thoroughly disinfect the soil by mixing 45 percent chloronitrobenzene with 50 kg of fine soil and mixing it into the soil. The disease can be prevented by spraying mycorrhizae a thousandfold.

2.Coriander root rot

The disease is usually found in low-lying moist land. When the roots are affected, they are yellowish-brown or brown, with almost no fibrous roots, and can be broken by hand, the plant dwarfs, and the leaves turn yellow.

measures: Do not plant parsley on low-lying land with excessive humidity, and irrigate the roots with 500 times of pralidoxime or 600 times of carbendazim, which is good for the prevention and control of this disease. Before sowing, the ground is mixed with one kilogram of carbendazim, and for the susceptible plots, 300 times the stubble killer solution is dropped.

3.Coriander leaf blight

The disease is particularly harmful to coriander, and once the disease occurs, it can spread to the entire plot, causing significant losses to growers. In the case of leaf blight, if there is too much water, the leaves of the coriander turn brown and rot, and in severe cases, the disease can penetrate into the heart leaves. The main cause of this disease is the presence of pathogens in the seedsmeasures

Therefore, it is important to treat the seeds and disinfect them thoroughly before sowing. Once the presence of leaf blight is detected, soybean zinc and other pesticides should be sprayed in time to remove the disease as soon as possible and allow the coriander to return to normal growth.

4.Coriander mosaic disease

The disease is more likely to occur when coriander is grown in greenhouses in winter. The leaves will turn yellow, and in severe cases, the heart leaves will be damaged, the coriander leaf plant will become dwarfed, and new roots and leaves will not grow, causing the plant to die. The disease can be transmitted by aphids and can spread very quickly.

measuresTo combat the disease, seeds should be sterilized before sowing and seedlings can be sprayed with 3% acetamiprid suspension weekly for about a month to suppress the virus.

Various diseases are described in detail here. The first disease is called sclerotinia sclerotinia disease. To ** this disease, we must first disinfect the soil.

Then we had to spray a thousand times the sclerotinia sclerotinia once, then again ten days later, about the third time in the spring. In addition, we should pay attention to environmental control, such as strengthening ventilation, which plays a good role in reducing diseases.

These diseases are coriander sclerotinia sclerotinia disease, coriander leaf blight, spot blight, and coriander root rot. The treatment method is to use pesticides to configure, and then sterilize, you can also use some fertilizers, and you can also spray some insecticides.

For example, leaf blight, sclerotinia sclerotinia disease, root rot, aphids, etc., it is necessary to choose the right agent, do a good job of ventilation, timely watering and fertilization, regularly prune branches and leaves, and strengthen management.