Stubborn insect pest selection is more exquisite! Don't come to the collection yet

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After the use of insecticides, it is necessary to enter the pest to reach the site of action of the insecticide before it can exert its insecticidal effect. But different pesticides reach the pests in different ways. Therefore, only by fully understanding the characteristics and living habits of pests themselves, as well as mastering the knowledge of insecticides, can we use the correct pesticide formulation for pests in the process of chemical control.

First, the insecticide is selected according to the characteristics of the pest mouthpiece

We know that there are nine purposes of agricultural production insects are the main agricultural pests, they are Coleoptera (Beetles), Lepidoptera (Moths and Butterflies), Orthoptera (Locusts, Crickets, Slugs), Hymenoptera (Leaf Bees, Stem Bees), Isoptera (Termites), Taprochinoptera (Thrips), Diptera (Fly Mosquitoes), Hemiptera (Bugs), Homoptera (Cicadas, Lice, Aphids, Aphids). However, most pesticides can enter the insect through the insect mouth organ before reaching the nervous system target and playing its insecticidal role. Therefore, understanding the mouthparts of pests is crucial for us to choose insecticide formulations to ensure insecticidal effects. According to the feeding characteristics of pests, they can be classified according to the characteristics of the mouth organs.

1. Chewing mouthpart pest:

Such mouthpart pests must eat plant leaves or other tissues when they are harmful to crops, causing damage such as leaf lack. The main pests are Lepidoptera larvae (such as leafrollers, noctuidae larvae, citrus butterflies, etc.), Coleoptera pests (beetles), orthoptera nymphs and adults (locusts, crickets, moths), hymenoptera larvae and adults, gastric toxic insecticides have the most significant effect on the control of such pests, and insecticides with good systemic properties but lack of touch and stomach toxicity are ineffective against such pests. In the production, we can control such pests and choose pesticides with good gastric toxicity.

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2, inhaling mouth pest:

This kind of pest to suck the plant larval tissue through the insect mouthparts, the main pests of the sap in the sucking tissue are aphids, leafhoppers, bugs, insect shell insects, adult mosquitoes, thrips, etc., such pests should choose insecticides with good suction or good endospiration and good gastric toxicity.

(1) Flufenacillitrile + ethyl polybactericide + Jiamei point 1000 times liquid: it has an internal suction conduction and osmotic effect, that is, it can do the legendary positive fight and reverse death. Control targets include aphids, thrips, whiteflies, rice brown planthoppers and ticks. The insects can be killed within 20 minutes after spraying, and the effect period is more than 20 days.

(2) Flufenacilamide + acetamiprid + Jiamei 1000 times liquid: Because its mechanism of action is different from conventional insecticides, aphids, thrips and whiteflies that are resistant to organophosphorus, carbamates and pyrethroids have special effects, and the effective period can reach more than 20 days.

Second, the endospiration of insecticides and the application of touch killers in pest control

Insecticides with touch killing effect mainly enter the body through the surface of the pest body, so the body wall structure of the pest is characterized by influencing the exertion of the touch killer effect. The waxy and lipid compounds contained in the epidermis on the wall of the pest body have no affinity with water, so the insect epidermis is usually not wet with water, and when the insecticide is diluted and sprayed on the insect body, the liquid will accumulate into a spherical shape and roll off the surface of the insect body. The body surface such as the insect shell insect has a thicker wax, the liquid is less likely to be wet, and the touch killer will lose its own insecticidal power. To solve this problem, in addition to the composition factors of the pesticide itself, pesticide auxiliaries and dosage forms are also key factors in solving this problem.

This may be the reason why pesticides of the same ingredient and preparations produced by different manufacturers have different insecticidal effects. Therefore, the quality of emulsifiers in emulsions, microemulsions and water emulsions is the key to improving the effect of insecticides, and the role of adhesives, wetting agents and synergists cannot be ignored.

(1) 22.4% spironoid ethyl ester (muwante) 2000 times liquid + 25% thiazinone 1500 times liquid + jiamei gold point 1000 times liquid;

(2) 22.4% heliostea ethyl ester (muwante) 2000 times liquid + 20% furoxamin (hurui) 3000 times liquid + Jiamei point 1000 times liquid, the two formulas alternately sprayed to control the effect of insect shell insects is good.

When considering the role of touch killers, we also take into account the endosmotic effect of pesticides, and understanding this role is of great significance for our use of pesticides. Like organophosphorus pesticides, in addition to some with an aspiratory effect, the others have good touch killing effect and gastric toxicity, but most of them have good endostomy, which can improve the rapid penetration of pesticide particles into insects after reaching the surface of the insect body, such as a preparation compounded by octyl thion and chlorpyrifos, which has a good contact killing and gastric toxicity effect and can be widely used to control chewing mouthpart pests such as moth and butterfly larvae. Most of the pyrethroid insecticides have no systemicity, touch killing and gastric toxicity are the main mode of action, and have good endospiration, so its insecticide is also very broad-spectrum. In addition, the role of endosmolarity has a major advantage, which can be used to control some drill moth pests in some grasses. Therefore, to control some borer pests, we can consider insecticides with good endospiration, but not necessarily insecticides with good systemicity. In fact, many pesticides have a variety of insecticidal mechanisms, but we need to understand which ways of action they are more prominent.

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Third, the use of chitin synthesis inhibitors and molting hormones

This type of insecticide mainly affects the formation of chitin on the surface of the pest or molting abnormalities, this type of insecticide has a strong gastric toxic effect, so it is only used in the larval or nymph stage, and it is better to chew the mouthpart pest, but it is not effective in other stages of the pest (pupae, adult). This kind of insecticide generally has a slow effect, in order to improve the effect of rapid killing, we often mix it with pyrethroids, organophosphorus and so on. Because such insecticides are less used, they are currently effective in controlling many highly resistant pests, and the key is to use them at a young age in larvae or nymphs. For example, butyl etherurea is used to control moth and butterfly larvae, the addition of deoxymethavid salt and jiamei point in the formula can improve the quick-acting effect of the control effect, and the compounding of thiazidone with imidacloprid and jiamei point is also a strong combination for the control of planthopper pests.

Fourth, the prevention and control of underground pests

Underground pests mainly include: grubs (scarab beetle larvae), ground tigers (a moth pest), crickets, caddisflies, and some insect pests such as bud maggots, leaf beetle pests may live in the soil at a certain stage due to their living characteristics, we also regard it as an underground pest at this stage, and underground pest control agents are needed for control.

Underground pests due to its special pest site, mainly in the soil or soil surface life, after application to consider the combination of pesticides and soil particles, some pesticides and soil after the combination of the loss of insecticidal effect, so the choice of insecticide ingredients is very critical, because this pesticide will be applied to the soil after binding with soil particles and invalid. At present, it can be controlled by octyl thiophos, chlorpyrifos or arvella, etc. + Jiamei dividend 1000 times liquid with water to drizzle roots; or thiamethoxamine + insect mite nitrile + Jiamei dividend 1000 times liquid leaching root irrigation to control, is also a better control method.

(1) Flufenacillione + prazidone + Jiamei gold point / Jiamei dividend 1000 times liquid: excellent control effect on a variety of crop stinging mouthpiece pests. It has a touch killing and suction effect. It can be transported in both xylem and phloem in plants, so it can be used as both a foliar spray and a soil treatment, and the effect is ideal.

(2) Flufenaceramide + thiamethoxam + Jiamei gold point / Jiamei dividend 1000 times liquid: for foliar spraying and soil irrigation treatment. After application, it is quickly sucked inward and transmitted to various parts of the plant, and has a good preventive effect on stinging pests such as aphids, thrips, planthoppers, leafhoppers, whiteflies, underground pests, etc.

(3) Flufenaceramide + furazolem + Jiamei dividend 1000 times liquid: it has the characteristics of touch killing, gastric toxicity, strong root assortment, high efficacy, long holding period of 4-8 weeks, wide insecticidal spectrum, and excellent prevention effect on stinging suction device pests, underground pests, etc.

Fifth, the drug formula for some special pests

Fruit-sucking nocturnal moth is a more difficult pest to control on fruit trees, in plum, peach, longan, lychee, citrus is seriously harmful, many growers have a real headache for its prevention and control, although adult insects are harmed by their beak sucking fruit, some people also use some strong astringent insecticides to spray control, but the effect is very small, in fact, in this regard, the control is mainly based on repellents for control, the current repellent effect is better insecticide feedback to fluorochlorocyanide triazole is a good formula, to 1500 times in the fruit ripening period every 15 days spray once.

The fruit fly in the melon crop, citrus current feedback in individual areas of serious occurrence, control is not very ideal, in this regard we mainly consider the real fly on the sweet and sour food tendency, the production of attractants, or the use of sexual attractants for control. The medicinal solution is selected as Avi, chlorpyrifos, etc., mixed with sweet and sour liquid, and made into a booby trap for booby traps. Sexual attractants are more effective.

Sixth, the formula for borer insect pests

For the pest of tianniu on the branch, the control method is mainly high-concentration liquid injection, and the agent is selected to inject insecticide with fumigation effect or systemic effect.

For example, the wood beetle moth and the winged moth that bore the branches of the year should be controlled by spraying during the incubation period of the pest eggs. The agent should choose insecticides with good gastric toxicity, good touch killing (and good endospiration). For example, the pear stem bees that control pear trees can be controlled with spray during the spring period, and attention should be paid to spraying the branches that were extracted in the same year.

For some borer moth pests on grass crops, it is also mentioned above that insecticides with strong endosmolarity can penetrate into the stem of the plant better after use on grass crops, so as to achieve better control effects.

What kind of medicine is used for drill heartworms and leaf curls?

1. Fluorophenylfenamide

Flufenoxamide has a contact killing and gastric toxicity, is systemic, almost all lepidopteran pests have good activity, effective control of lepidoptera pests of adults and larvae, especially effective against larvals, fast action, long duration of effectiveness. The prevention and control of corn borer, sugarcane two-point borer, large borer, etc., in the 1-3 age stage of medication, the prevention and control effect is outstanding. The following compound agents are more effective, flubenzamide + thiamethoxam + caramot point; fluorophenyl amide + imidacloprid + jiamei point; fluorophenyl amide + ethyl spironium + jiamei point; fluorophenyl amide + thiazide + jiamei point.

2. Chlorhexate benzamide

Chloranthrine benzamide has a strong permeability, can be transmitted through the xylem to the top, to achieve the purpose of killing pests, is a very good insecticide, control of dimorphs, triad borer, corn borer, ground tiger and other pests, in the larval stage, with the following compound agents, the effect is better, chlorantranoid benzamide + high efficiency cypermethrin + carnandomin point; chlorobug benzamide + insect moth nitrile + carmine point; chloranthrum benzamide + chlorpyrifos + jiamei point; chlorantran benzamide + thiamethoxam + Chia Min Point; Chlorofuran benzamide + ethyl polybactericide + Jia Min Point.

3. Insecticidal double

The insecticidal double has a strong internal absorption effect, which can be absorbed and conducted by the leaves and roots of crops. 24 hours after application, the agent can be distributed to the whole plant, so it has a good control effect on borers. In the early age of pests, the following compound agents are used, the effect is better, insecticidal double + imidacloprid + jiamei point; insecticidal double + avermectin + jiamei point; insecticidal double + high efficiency cypermethrin + jiamei gold point.

4, Touji

The insecticidal active ingredient of bitter vine has the characteristics of anesthesia, food refusal and gastric toxicity, touch killing, and does not produce drug resistance, does not kill natural enemies, and has stable physical and chemical properties. It is effective for beet nocturnal moth and twill moth, and is effective for rice longitudinal leaf borer, large borer, dihua borer and triple borer! The validity period is about 30 days!

5. Bacillus thuringiensis

Bacillus thuringiensis has the characteristics of a wide insecticidal spectrum and no resistance. The control of corn borer, sugarcane two-point borer, rice dimorph borer, pod borer and other borers has a good high efficiency and lasting effect in the early larval stage.

This article was written by cathay pacific's technical team

bibliography:

"Pesticides according to the characteristics of insect pests", China Encyclopedia Network

"Pesticide Selection and Application" Jinnong Network

"How to use the appropriate insecticide according to the characteristics of insect pests" Jianshui County Plant Protection Station