When is the best time to control soybean heartworm?

Soybean heartworm is best controlled before the larvae enter the pod.

Soybean heartworm larvae hatch in pods.

The time to climb is generally no more than 8 hours. This time is difficult to grasp. Therefore, the larval control must go through field investigations, and pesticides can be applied when the soybean pods see eggs.

Larval control - generally use pyrethroid agents mixed with water spray. The spray should be even, especially on the pod-forming area. The larval control effect of this method can reach about 80%.

Soybean heartworm control methods

1. Choose insect-resistant or insect-resistant varieties.

The selection of insect-resistant and insect-resistant varieties is the most economical way to control soybean heartworm, but the insect-resistant varieties have a certain regionality, and the varieties with low insect eating rate and good yield must be selected according to local conditions.

2. Reasonable crop rotation.

Crop rotation can reduce the rate of insect eating than continuous cropping, the plot of soybean planted with conditions, it is necessary to choose at least 1000 meters away from the soybean stubble of the previous year, try to avoid heavy stubble, stubble, field management can be taken to increase the number of tillage weeding, especially in the pupation and feathering period to increase the shovel trip, can reduce the amount of adult featherement, conditional plots can implement water, early field rotation.

3. Deep ploughing and heavy stubble.

After harvesting, clean up the pods and dead leaves in the field in time, seize the time to carry out autumn ploughing, destroy the soybean heartworm wintering site, and turn the soybean heartworm drilled into the soil to the topsoil through mechanical damage.

Sun, wind, rain, natural enemies, etc., make the soybean heartworm die.

Increase. The above content reference:

Encyclopedia—Soybean heartworm.

The best time to prevent soy heartworms:

1. Prevention and control of larvae before entering the pod:

After hatching, soybean heartworm larvae generally crawl on the pods for no more than 8 hours. This time is difficult to grasp. Therefore, the control of larvae must go through field investigations, and pesticides can be applied when eggs are seen on soybean pods.

The larvae are generally sprayed with pyrethroid agents. The spray should be even, especially on the pod-forming area. The larval control effect of this method can reach about 80%.

2. Prevention and control methods of soybean heartworm:

Soybean heartworm is commonly known as soybean pod borer and small bloodworm. The larvae eat leaves, spin silk and roll leaves, and in severe cases, they can eat all the leaves and only the leaf veins, and can gnaw on melons and fruits, and even moth into the fruits. The larvae are boring pests, which are harmful to the heart leaves and leaves of vegetable seedlings, and the damaged seedlings stop growing or wilt and die due to the destruction of the growth point, resulting in lack of seedlings and broken ridges.

After being damaged, cabbage and cabbage could not form balls and hugs, and soft rot was spread, resulting in reduced yields.

1.The best period for the control of soybean heartworm: from the first flowering to the full flowering period, spray control every 7-10 days, and control 2-3 times can have a good control effect.

2.Alternate use 1500-2000 times of high-efficiency cypermethrin EC or 1500 times of dichlorvos with dimethoate, which will have a good control effect. Spray pesticides at an early stage when soybean seedlings begin to grow.

The best period for soybean heartworm: from the first flowering to the full flowering period, spray control every 7-10 days, and control 2-3 times can have a good control effect. Soybean heartworm has a good control effect with avermectin during the flowering period.

First, what is a peach heartworm?

To put it simply, the peach heartworm is also called the peach fruit, also known as the apple heartworm, and also called the peach fruit moth. It mainly harms apples, peaches, pears, plums, cherries, loquat and other fruit trees.

2. Morphological characteristics.

Adults are 7 to 8 mm long and grayish-white or light left-brown.

There is a large blue-gray triangular spot in the middle of the forewings, and the basal part of the ** part has 7 clusters of yellowish-brown oblique scales.

The eggs are round and dark red.

The body of the instar larvae is 13 to 16 mm long, the whole is pink, and the body of the young larvae is white.

Third, it is a symptom.

In order to harm apples and other kernel fruits, the larvae are mostly bored by the carcass of the fruit, and teardrop-shaped pectin flows out of the cavities, commonly known as it"Tears"It soon dries up and becomes a white waxy powder, and the cavities heal into small black spots that are slightly concave.

The larvae often go directly to the heart of the fruit, eat the pulp, and excrete feces in the tunnel, commonly known as"Ground bean paste", the young fruits that are not sufficiently enlarged are mostly deformed, commonly known as lion's mane fruit"。

Fourth, the characteristics of occurrence.

Mature larvae overwintered in a soil layer of 1 13 cm.

Overwintering larvae begin to emerge in mid-May, and peak in mid to late June.

The first generation of larvae mainly eat apricot and peach fruits, and after the larvae mature in the fruit, they bite out of a round hole and fall directly into the soil to form bitter pupae.

Adults are inactive during the day after emergence, and are most active within 1 to 3 hours after sunset, with no obvious phototaxis and transoverization.

The eggs are mostly laid in the calyx depressions of apples.

The larvae hatch and burth from the carcass of the fruit into the fruit, go straight to the heart of the fruit, feed on the seeds of the fruit, and then eat the pulp.

Fifth, the best time and method of treatment.

Apply the pesticide once each from mid-June to mid-July. Each time with 25% phosphine emulsifiable concentrate kg, add water 50 9. Spray evenly under the canopy.

Especially during the emergence of larvae, if the pesticide is applied 2 to 3 days after the rain falls from the sky, the effect is better.

Spray pesticides on trees at the appropriate time, generally in mid and late July to early August, spray once each, kill 3000 4000 times of emulsifiable concentrate with the enemy, and spray evenly.

Special attention should be paid to the wintering sites of the peach heartworm such as fruit piles.

The peach heartworm is referred to as peach, and the larvae eat the fruits of many fruit trees such as peaches, pears, apples, dates, and hawthorns. The damaged fruit is deformed, and the fruit is full of insect feces, commonly known as lion's mane fruit and bean paste filling. The Forestry Institute of the insect area monitored Shaya County, Xinhe County, Kuqa County and other places that harmed jujube fruits, and there were many varieties of damage and the degree of damage to fruit trees was serious.

For the prevention and control of peach heartworm, a series of comprehensive control measures should be adopted such as the combination of prevention and control under the tree and on the tree, the combination of chemical and artificial control, and the combination of prevention and control in the park and outside the park.

Chemical control of peach heartworm:

In order to improve the prevention and control effect and reduce the use of drugs, timely application of pesticides should be combined with monitoring. The sexual attractant monitoring method was used to grasp the two key periods of control of P. peach, one was the peak period of overwintering larvae (i.e., when the adult P. peacha was first induced) to carry out ground controlThe second is spray control before the hatching larvae are bored (the peak period of insect trapping). In addition, after the end of July, the second generation of larvae should be controlled in a timely manner in combination with the survey data of egg and fruit rate.

The specific prevention and control guidance is as follows:

1.Ground control.

Orchards and grass-covered orchards with irrigation conditions and high soil moisture are preferred for biopesticides. In addition, a peach heartworm trap is set up in the orchard, and from the day the adult worm is lured, it begins to spray the ground to kill the unearthed overwintering larvae. The commonly used agent is octathion emulsifiable concentrate, which is evenly sprayed on the ground under the tree.

Or use 3% phoxanthrine granules mixed with 8 kg of fine sand, sprinkle into the tree tray and then hoe the soil shallowly.

2.Tree control.

Tree control must choose high-efficiency, low-toxicity, low-residue agents. Generally, when there is a peak of adults on the trap, spraying on the tree is started, and it is recommended to use tiger spicy dry hanging.

When soybeans enter the pod-setting stage, farmers are most worried about the harm of small bloodworms. Also known as heart borers, this small bloodworm mainly harms the seeds of soybeans. It is one of the common pests among soybean pests and diseases.

Not only will it reduce the final yield, but it will also have a certain impact on the quality of soybeans. In severe cases, soybean yield can be reduced by 10% to 30%, reducing farmers' incomes and greatly dampening farmers' enthusiasm for planting beans. So how to prevent and control soybean heartworms?

1. Continuous cropping. As mentioned at the beginning, due to the adjustment of the planting structure in the past two years, some farmers used to grow soybeans and now continue to grow soybeans. Under the condition of continuous cropping for many years, the occurrence of soybean borer is becoming more and more serious, and the control is becoming more and more difficult.

On the other hand, some farmers do not pay attention to the control of soybean borer or do not know how to control it, which will lead to an increasingly serious situation.

2. Weather factors.

Soybean heartworms prefer weather with moderate temperatures and high humidity. In this weather, the occurrence of borers is aggravated. If the relative humidity of the soil in the field is 10% to 30%, it will be conducive to pupation and feathering.

Conversely, if the weather is hot in the summer and the fields are relatively dry, the incidence decreases. At the same time, when the temperature is low in winter, it will cause a large number of borer deaths. It is precisely because of the harm of soybean heartworm that it affects the planting enthusiasm of some farmers.

Therefore, against this pest, we must learn how to control it to ensure the final yield and quality.

3. Variety selection.

Before planting, choose soybean varieties that are highly resistant to insects. Under the premise of the same insect condition, the degree of damage will be reduced, but the varieties are regional, and the varieties with insect resistance suitable for local planting should be selected.

Fourth, reasonable rotation.

Proper crop rotation is a good measure to prevent borer, especially in plots where soybeans have been planted for many years. After several years of rotation, the results are remarkable. If conditions permit, water-drought rotation can be adopted, and the effect is better.

5. Unleash natural enemies.

There are many natural enemies of the bean heartworm, the common one is the red-eyed bee, which is best released in the field during the peak oviposition period of the soybean heartworm adult. This method is suitable for growers with a lot of farmland, and interested friends can try it, and the effect is also good.

Sixth, deep ploughing of the land.

Deep ploughing of the land also has a good preventive effect on pests and can be carried out after the soybean harvest. On the one hand, it is to clean up the sick and crippled corpses thrown from the ground and destroy the wintering sites. On the other hand, after the soil is deeply cultivated, the borers that burrow into the soil turn to the surface of the soil and die after being exposed to the wind and sun, thus reducing the number of fields.

7. Chemical reagents.

The first measure that comes to mind for many farmers is to use chemicals to control fruit borers. At present, there are many pesticides for the prevention and control of borers on the market, such as chlorpyrifos, malathion, deltamethrin, cyfluthrin, fenvalerate and other single agents, and there are also many compound agents, such as chlorantraniliprole, chlorpyrifos, phosphine, etc.

At this time, insecticides or fungicides should be used, soil fertility must be ensured, watering and fertilizing should be done in time, and then the right medicine should be prescribed, and then the time of light should be ensured, the temperature of planting should be paid attention to, and water and fertilizer management should be strengthened.

You can use the way of spraying pesticides, turning the soil, spraying the granule, watering, and spraying the nutrient solution to control the soybean heartworm.

It should be carried out at the beginning of August, and it can be controlled with chemicals, so that the soybean yield can be better.

<> eggs hatch to 2 instar is the best time to control soybean heartworm, usually in the adult peak period, the corn stalk (has been cut into 20cm pieces) in 80% dichlorvos emulsifiable concentrate to let it absorb the solution, the amount of dichlorvos emulsifiable concentrate is 100-150ml mu, when the corn stalk becomes a medicine stick and then fumigation control. Generally, 20% betathiol para-closed phosphorus powder or 2% pine borer powder can also be used to control soybean heartworm.

1. The best period for soybean heartworm control

1. The best prevention and control time.

The best time to control soybean heartworm is the peak hatching period of eggs to before the 2nd instar, usually in the sunny night in early August, you can see a group of moths flying in circles in the soybean field with a relatively good type of ridge sealing, at this time it is the time when the female moth and the female moth lay eggs, and it is also the best period for control.

2. Prevention and control methods.

1) Usually 20% bethion powder, 2% pine borer powder, methyl 1605 powder, 3% tricarb powder and other agents can be used to control soybean heartworm, and the dosage per mu is generally as follows.

2) In the peak period of adults, the corn stalks can be cut into 20cm small segments, and then prepare 100-150ml mu of 80% dichlorvos emulsifiable concentrate, and then put the cut corn stalks in the solution, when it absorbs enough liquid medicine, it becomes a medicine stick, and then it can be fumigated, and 40-50 medicine sticks can generally be used per mu.

3) Heartworms usually lay their eggs on pods with more hairs, so it is recommended to choose soybean varieties with fewer pods when planting.

4) It is necessary to do a good job in autumn ploughing to increase the mortality rate of overwintering insects, so as to reduce the base number of overwintering insects.

2. Harmful symptoms of soybean heartworm

1. Soybean heartworms usually start to bury in the form of larvae from the seams of the pods, biting the beans into grooves or broken shapes.

2. Overwintering larvae usually break the cocoon activity in early July, move to the soil surface and then form cocoons and pupate, after 10-12 days of pupal stage will enter the adult stage, the adult period generally occurs in late July to early September, mid to late August is usually the peak period, late August is the peak period of adult oviposition, and early September is the peak period of larvae damage.

3. Adults generally lay eggs at dusk, most adults will lay eggs on pods, and a few adults will lay eggs on petioles, side branches and main stems, if they encounter high temperature and dry, low temperature and rainy weather, it is not conducive to adult egg laying.

The first is threshing while harvesting, which can prevent heart-eating insects from continuing to damage in the pod after harvesting. The second is to apply pesticides to the bottom of the soybean stack before harvesting to reduce the source of insects next year. The third is to carry out autumn ploughing and autumn harrowing in the soybean field, which destroys the wintering place of the heart-eating insects that have shed their pods into the soil before harvesting, and increases the mortality rate.