Why does Spodoptera litura? What pesticides work well?

It is an omnivorous pest, which has an impact on cabbage, cabbage, mustard greens, potatoes, and eggplants in vegetables, 1) agricultural control. Eliminate weeds, autumn ploughing or winter plowing to eliminate part of the overwintering pupa.

2) Trapping adult insects. At the adult stage, trap the adults with a black light or sweet and sour bowl.

3) Pharmaceutical prevention and control. 1 The best application period is before the 2nd instar larvae are dispersed. Can be used 5 calorie gram emulsion 1000 times liquid

Spodoptera liturae is easy to produce at high temperatures, and its main pathogenesis characteristics are: suddenness, explosiveness, fast reproduction, etc., the larvae survive in melons, and absorb melon food, 1. Plough idle fields in time and eradicate weeds at the edge of the field. At the peak period of larvae pupating into the soil, pupation was carried out in combination with agricultural operations to reduce the number of insect populations in the field.

In the pupation stage of Spodoptera litura, irrigation combined with drought resistance can drown most of the pupa and reduce the base number. 2. From the peak of Spodoptera litura's oviposition to the initial hatching period, the eggs and hatching larvae should be manually removed and the leaves should be taken out of the field for centralized destruction. 3. Reasonably arrange the planting stubble to avoid continuous cropping of Spodoptera litura host crops.

4. Crops can be rotated with rice where conditions permit. 5. In the peak period of Spodoptera litura, black light and sweet and sour wine are used to trap and kill adults.

This is mainly due to the fact that the surrounding weeds were not removed from the egg masses before planting, which led to the spread of larvae. This insect pest is very easy to control, and can be used with 1000 times of insect plague No. 1 Spodoptera lituravirus insecticide, or avermectin EC 2000 times, or 5 Taibao EC 2000 times, or 10 imidacloprid wettable powder 1500 times, or 18 Schpide EC 1000 times.

Because Spodoptera liturae eats this stuff, I recommend using avermectin and cypermethrin, which my uncle used to grow it.

What are the dangers of melon silk borer to gourd?

The melon silk borer is also called the melon borer and the melon wild borer. The main hosts are bitter gourd, loofah, zucchia, melon, winter melon, watermelon, tomato, eggplant, cotton, etc. In Guangdong, the insect is more serious to bitter gourd, with larvae eating leaves, fruit borer, serious can eat up the leaf mesophyll, only the leaf veins remain; The larvae eat the fruit with thousands of holes, reduce the value of the commodity, or cause fruit rot and cannot be eaten.

The young larvae feed on the mesophyll on the back of the leaves of melons, so that the leaves are gray and white, and after the 3rd instar, the leaves or tender shoots are conjugated, and they live in them to feed, so that the leaves are perforated or missing, and only the leaf veins are left in serious cases, until they are bored into the fruit and stems, which seriously affects the yield and quality of melons and fruits.

When does the melon silk borer occur?

The larvae emerge in late April, peak from mid-May to early June, and end in mid-to-late June.

Prevention and control: 1. According to the living habits of the melon silk borer, the young leaves and vine tops of the seed vines and grandchildren are removed in time during the peak period of adult oviposition, and the leaf curls with insects are removed in time during the larval period, and the old leaves and the old yellow leaves at the base are removed in time when the pupation peaks are removed, and the insect population base in the field is treated intensively. Protect the natural enemies of this insect mainly include the egg-parasitic Pseudo-Australian red-eyed wasp, the larval-parasitic Philippine flat-strand wasp and the melon borer cocoon wasp.

2. Advocate the use of yellow red-eyed bees to control melon and silk borer. In addition, in the early stage of larvae, the leaf curls are removed in time and placed in the natural enemy protector, so that the parasitic wasps and other natural enemies fly back to nature or the melon field, but the pests stay in the protector to concentrate on eliminating some larvae.

3. After the harvesting of agricultural prevention and control melons and fruits, the dead branches and fallen leaves should be collected, and the dead branches and fallen leaves should be cleaned and buried or burned to eliminate the larvae and pupae hidden in the dead vines and fallen leaves, so as to reduce the base number of insects. Plough the soil in time, irrigate appropriately, increase soil moisture, and reduce the feathering rate. Physical control: In the peak period of adults, frequency vibration insecticidal lamps or black lights are installed in the field, and adult phototaxis is used to trap and kill adults and reduce the amount of eggs in the field.

The first point will cause death, then it will not survive very scary, the second point is likely to have a lot of melons, which is not good, the third point will appear a lot of insects, the harm is great, the fourth point is that it will happen in March and April, to pay attention.

The melon silk borer is also called the melon borer and the melon wild borer. The larvae eat the leaves and eat the fruits, and in severe cases, the leaf and mesophyll can be eaten up, leaving only the leaf veins; The larvae eat the fruit with thousands of holes, reduce the value of the commodity, or cause fruit rot and cannot be eaten. The larvae of the melon silk borer generally emerge in late April, with a peak period from mid-May to early June, and a late stage in mid-to-late June.

It may affect some pests and diseases, and it will reduce our yield, and sometimes it will become very wilted, which usually occurs in July and August, because the weather is very hot at this time.

Spodoptera litura, which was sprayed alternately with 21% killing emulsifiable concentrate 6 000 8 000 times. Winter melon is a common vegetable in life, and we eat it is also very delicious, some people just like some winter melons very much, and another is when we make soup, or stew some pork rib soup, add a few winter melons, it will be very delicious, and therefore, in the process of winter melon planting, it is inevitable that there will be some pests and diseases, among them, if Spodoptera litura, it is more common one, <>

This ** is very harmful on the winter melon, it is an omnivorous, or a gluttonous pest, my country is very widely distributed, mainly our country is mainly divided into the north and south, the north is good to say, as long as there are more in the south, and in addition to these winter melons, he will also erode other vegetables, it can be said that it is very annoying, and then his shape is, a small round brown thing, as long as they will cause some bad effects on plants or vegetables, the effect of some smoke of plants and vegetables. <>

And then we humans can't get or can't absorb some of the nutrients that we deserve, so it's not good to say this. Therefore, if there are vegetables with such problems, there are three main methods, the first is mainly about agriculture, to properly and weeds, and combined with some operations in the field to remove such pests, the second is to trap, can be with other vegetables, or specifically to fight against its natural enemies, can also reduce their number, the third is some aspects of chemistry, you can buy some about specialized, ** these pests, Those drugs are mixed with some appropriate water, and then sprayed on plants or vegetables, so that when pests bite it, they will get a certain amount of control and effective control, so this is also very necessary. <>

1. Booby trap adult insects. Adult peak point (black light) lamp or set up sweet and sour liquid tray (sugar: sprinkle:

Vinegar: water = 2 1 2 2) add a small amount of pesticide to trap moths, or insert dipping medicine willow branches to trap moths. 2. Pharmaceutical prevention and control.

For pesticide control at the peak of larval incubation, you can use 50% fenvalerate 4000 times, or 20% fenvalerate 2000 times, or 5000 times kung fu solution, 1000 times of larvaluride, or 21% 6000-8000 times of killing, or 50% phosphine or 80% dichlorvos 1000-1500 times of liquid, 2-3 times, 1 time every other day, alternate spraying. Commonly used drugs fenvalerate, fenvalerate, fenamethrin, fengiving, chlorpyramide, pyroxine, dichlorvos.

Avermectin, cypermethrin, and phosphine can be used. These drugs are very effective and can have a certain preventive effect.

It will work well with insecticides that are specifically designed to deal with them, because they are very harmful insects, and pesticides have been developed to prevent them.

Virulence should be used, the effect of this medicine is very good, and it can harm pests and diseases, which is 5 times the efficacy of ordinary medicine, which is very effective.

Gourd is also known as gourd, flat cattail, gourd, night flowering, black gourd, etc., and is a temperature-loving plant. Native to southern Africa, it is now cultivated throughout China and widely cultivated in tropical to temperate regions of the world. But what should I do if I am plagued by pests and diseases during the cultivation of gourds?

Let's take a look.

What is the growing environment of gourds?

Gourd is a temperature-loving plant, growing at a suitable temperature of 20 25, not tolerant to waterlogging and drought, and should pay attention to drainage in rainy areas, and timely irrigation during drought. Temperature-loving, small low temperature tolerance, seeds germinate at 15, germinate fastest at 30 35, and the appropriate temperature for growth and fruiting period is 20 25. Long gourds are not resistant to high temperatures.

High requirements for light conditions, less disease in the case of sufficient sunlight, good growth and fruiting, and high yield. It has strict requirements for moisture, and is not resistant to early and waterlogging. High air humidity is required during the fruiting period.

It is not tolerant to barrenness, and it is advisable to use humus rich in water and fertility in the soil, and the required nutrients are mainly nitrogen, and the appropriate amount of phosphorus and potassium fertilizer is applied, so as to improve the yield and quality.

How to control gourd diseases and pests

1. Blight.

Symptoms] Attack the root and stem at the base, the leaves are seriously wilted, the appearance of the initial disease after flowering and melon formation seems to be dehydrated, obvious wilting at noon, it can still recover in the morning and evening, the roots turn brown or rot, and the affected part overflows amber gelatin.

Prevention and control] can be selected with 50% carbendazim 500 times dilution, 70% tobuzin 600 times dilution, fulvic acid 800 times dilution, special verticillium 1500 times dilution, 50% dilution of dixone 500 times, or one of the 600 times dilution of pyroxyl or agricultural streptomycin and other root irrigation.

2. Anthrax.

Symptoms] The initial lesion is pale yellow and nearly round, and the later lesion ** ruptures. In severe cases, the leaves die, the petioles appear light brown stripes, the fruit is infected with light green water stains, and then the middle depression nearly round dark brown lesions appear, and sometimes the surface overflows orange sticky matter or rots.

Prevention and control] can be selected with 70% tobuzin 600 times dilution, 75% chlorothalonil 500 times dilution, 600 times dilution, clochloryl 1000 times dilution, Fenghu ammonia 1000 times dilution, sulfur suspension 500 times diluent one of the cross spray control.

3. Downy mildew.

Symptoms] small pale yellow spots appear on the affected leaves, and lilac mold appears on the back of the lesions when wet.

Prevention and control] can be selected with 58% Ruixin 500 times dilution, manganese zinc acetate 500 times dilution, 60% alum 500 times dilution, clomycolin 1 deletion dilution, Bedeli 600 times dilution, 70% mancozeb 500 times dilution, and one of the 500 times dilution of Plague Frost can be used for spray control.

4. Pests. 【Hazards】The insect pests of gourd mainly include gourd aphids, gourd flies, yellow gourds, noctuidae exigues, etc., which harm the roots, leaves, stems and fruits of gourds.

Prevention and control] can be controlled by deep application or sprinkling of milel and mixed insecticidal pesticides with pyrethroid pesticides.