What kind of pesticides are commonly used on lychee trees?

When growing lychees, like other fruits, they are inseparable from a chemical - pesticides. Proper use of pesticides can effectively kill pests, make lychee trees grow better, and increase the fruit-bearing rate of lychees. So what should farmers pay attention to when spraying pesticides on lychees?

Let's take a closer look at it.

1. If you want to spray pesticides on lychee trees, be sure to observe the wind speed first, and it should not exceed one meter per second.

If you use ground volume spraying to spray litchi trees, the wind speed should not exceed 5 meters per second.

If ultra-low volume spraying is used to spray pesticides on lychee trees, the wind speed should not exceed 1 3 meters per second.

Because spray pesticides or powder pesticides are easy to be blown away by strong winds, this reduces the probability of pesticides attaching to lychee trees, and can not achieve the effect you want, and pesticides will spread with the wind, which is easy to cause environmental pollution.

2. Do not use pesticides in rainy weather, because pesticides are easily washed away by rain and cannot achieve the effect you want. In addition to this, pesticides can also soak into the soil with rainwater, causing environmental pollution.

3. It is not suitable to use pesticides in high temperature and hot weather, one is that in high temperature weather, pesticides are easy to be decomposed and volatilized to affect the effect, and the other is that it is easy to poison the pesticide operators of construction in high temperature weather.

Spraying pesticides on lychee trees has very high requirements for the climate, and it is suitable for 20 20 climates without rain.

4. Do not dilute pesticides with well water, because well water contains a large amount of calcium and magnesium substances, which will destroy the emulsification and suspension properties of pesticides, resulting in reduced or even no efficacy of pesticides.

5. WP pesticides must be used in accordance with their instructions, not directly sprayed as powder, and can only be used as a suspension after dissolving water.

Because wettable powder adds a certain amount of wetting agent and filler to the original drug, after mechanical grinding into powder, it must have high active ingredients but very poor fluidity compared with ordinary powders.

6. When using granular pesticides, we must operate in strict accordance with the instructions for use, and generally do not allow soaking spray, but use the method of applying pesticides on the ground and under the ground to control weeds and pests.

Granule pesticides are very targeted, and most of its original drugs are highly pesticides, but the toxicity is reduced after granulation treatment, and if you use the way of soaking water spray, it will restore its toxicity, and it is easy to poison the operators who play pesticides.

7. When spraying ultra-low amount, high concentration of pesticides cannot be used, because ultra-low amount spraying has a higher concentration of liquid than conventional spraying, so it is limited to spraying pesticides with low toxicity, such as: dimethoate, malathion, pine borer and so on.

Even if it is a drop concentration of pesticides, the operators of pesticides always have to stand in the upper hand and walk without medicine, and pay special attention to not using high-concentration pesticides such as Suhua for low-level spraying, which is easy to cause pesticide operators to be poisoned.

It must belong to the pesticide base, because he will definitely spray some more, but not too much, so the efficacy is very low, just to flush this, it should be able to play a good effect.

Summary. Lychee should not be sprayed with pesticides when flowering, because during the flowering period of lychee, to avoid pollination and fertilization to produce nutrients, pesticides and foliar fertilizers can be sprayed before and after the white point of lychee, which plays the role of insecticide and sterilization, and through phosphorus, boron, zinc, etc.

What pesticides to use during the flowering period of lychee.

Lychee should not be sprayed with pesticides when flowering, because during the flowering period of lychee, to avoid pollination and fertilization to produce nutrients, pesticides and foliar fertilizers can be sprayed before and after the white point of lychee, which plays the role of insecticide and sterilization, and through phosphorus, boron, zinc, etc.

Can it be sprayed after flowering.

OK.

Lychee flowering stage spray butyryl hydrazide and ethephon, triaconol, gibberellin, ethephon.

1. Butyric hydrazide and ethephon

Spray the whole tree during the flowering period of lychee, so that the total number of flowers and the number of male flowers will decrease, and the number of female flowers will increase.

2. Triaconyl alcohol

Spray once after the full flowering period of lychee and once before the first physiological fruit drop, which can improve the fruit setting rate and increase the weight of a single fruit.

3. Gibberellin

Spraying after flowering can improve fruit set and overall yield.

4. Ethephon

Spraying at the budding stage of lychee can play a role in thinning flower buds and improve the overall yield.

Lychee management before and after flowering

1. Fertilize before flowering

Pre-flowering fertilizer should be applied to Xihong lychee plants in time before flowering, and potassium fertilizer and phosphate fertilizer should be applied from the budding stage to about 10 days before the opening of female flowers, which can effectively reduce the frequency of young fruit cultivation failure.

2. Prune the flower spikes

Before lychee flowering, the flower spikes should be pruned to reduce nutrient consumption, the longer flower spikes should be cut off, the top of the flower spikes that are more than 15cm long, and the flower spikes that are weak and overly dense should be cut off.

3. Spray flowers

For the first time, spray the drug on the wound immediately to prevent the wound from being infected with germs. When the female flowers bloom for the first time, they should be diluted with medicinal water and sprinkled on the leaves. When the stigma of the female flower turns brown, the last thing is to spray the medicine on the canopy of the lychee tree.

4. Promote pollination

The artificial pollination of lychee trees should not be carried out in the full flowering period, which is easy to cause spit flowers. Foliar spraying of potassium dihydrogen phosphate for 3-4 consecutive times is advisable, and at the same time, hormones are sprayed to improve the pollination rate.

The pesticides that can be used for lychee are as follows:

Trichlorfon is a broad-spectrum, high-efficiency and low-toxicity organophosphorus pesticide. It has a strong stomach toxicity and contact killing effect, and is currently the most commonly used, the most effective and the cheapest medicine for the prevention and control of lychee bugs. In addition, it has a good control effect on a variety of lepidopteran larvae and beetle adults that eat fruits, leaves and young shoots.

The usual concentration is 90 trichlorfon 600 800 times the solution. However, the effect on aphids and mites is poor.

Dimethoate broad-spectrum, moderately toxic organophosphorus insecticide and acaricide. It has obvious systemic effect, which can be absorbed by all parts of the plant and run around the body, so it is especially suitable for the prevention and control of pests of stinging and sucking mouthparts, such as thrips and aphids; lychee gall mites, etc. The usual concentration is 40 emulsifiable concentrate l000 times.

Dimethoate. Broad-spectrum, systemic insecticide and snailicide. It can control a variety of pests with stinging and sucking mouthparts, especially aphids, mites and scales that have developed resistance to dimethoate, and have special effects on lychee gall mosquito eggs and hatched larvae; The usual concentration is 40 emulsifiable concentrate 1000 2000 times liquid. Because it has a strong systemic effect, it can be used as a rapid spray, and can also be used in a variety of application methods such as root application, smearing, and bandaging.

Dimethoate oxide is a highly toxic pesticide, and the residue period is long, we must pay attention to safety when using, and it is forbidden to use it within 1 month before the fruit is harvested. It is recommended that it is best used as a winter and spring garden.

It is not recommended to use drugs during the flowering period, it is too sensitive.

1. Stocking beehives per mu during the lychee flowering period. 2. Artificially assisted pollination: at 9-11 o'clock in the morning on a sunny day, collect or shake off the male lychee flowers that are blooming, put them in clean water and gently scrub them and filter them, then add kilograms of borax, kilograms of urea, and kilograms of potassium dihydrogen phosphate to every 100 kilograms of pollen water, stir evenly and spray them on the flower spikes of the blooming lychee female flowers.

3. Root topdressing and the use of hormones to protect flowers and fruits: 10-15 days after the female flowers bloom, the young fruits are combined with the grain stage, combined with the prevention and control of diseases and insects, and the young fruits are sprayed with kilograms of urea and kilograms of potassium dihydrogen phosphate per 100 kg of water. During the abortion period of the embryo.

May 20-25), per 100 kg of water plus kg of urea and 25-30 ml of proguolin mixed and sprayed. About 20 days before harvesting, add 1 urea plus 1 gram of ninety-two and 25-30 grams of Baoguoling per 100 kg of water and spray after mixing well.

Summary. Hello, glad to answer for you.

Lychee can not be sprayed with any pesticides and foliar fertilizer during flowering to avoid pollination and fertilization of flowers and foliar nutrition, lychee is sprayed with pesticides and foliar fertilizer before and after the white spot, the main role is to kill insects and sterilize and supplement nutrients to flowers by supplementing phosphorus, boron, zinc, etc., and can add micro-fruit and micro-boron power when spraying to promote the differentiation of flowers and buds.

Can lychees be sprayed when they bloom.

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Can lychees be sprayed when they bloom.

Hello, glad to answer for you. Lychees should not be sprayed when they are in bloom. Lychee can not be sprayed with any pesticides and foliar fertilizer during flowering to avoid pollination and fertilization of flowers and foliar nutrition, lychee is sprayed with pesticides and foliar fertilizer before and after the white spot, the main role is to kill insects and sterilize and supplement nutrients to flowers by supplementing phosphorus, boron, zinc, etc., and can add micro-fruit and micro-boron power when spraying to promote the differentiation of flowers and buds.

There are too many bugs. Is lychee in its peak blooming season?

For example, in the prevention and control of pests, you can use cyhalothrin, deltamethrin and other pyrethroid insecticides, pyrethrin, lice urea, emamectin salt, gramacarte, sweep mite, pyridafen, avermectin and other acaricides.

If you want to say that long-term and low-toxicity, relatively safe insecticides for humans and animals, it must be green pollution-free pesticides. This kind of insecticide is safe and harmless to human health, low pollution, low toxicity or none, easy to decompose, and the dosage is small. Such as bio-derived pesticides, mineral-derived pesticides, organic synthetic pesticides, insect pheromones, food repellents, growth and development inhibitors, etc.