Spring warm season, everything resurgence, a large number of plant buds have become a good meal for insects, although it is a common behavior in nature, but for farmers is a headache, will lead to harvest and production, so in order to reduce the damage of insect pests to crops, we have produced a large number of different insecticides out, a wide variety of insecticides look at the mechanism of action is the same, then how do we choose really suitable for their own crops to use?
This time, we will talk about two drugs with similar mechanisms of action - imidacloprid and thiamethoxazine.
For imidacloprid we farmers are very familiar with, then thiamethoxine is a new star for insecticidal, where is its advantage over the older generation?
Analysis of differences between imidacloprid and thiamethoxam
Although the mechanism of action of the two is similar (selective inhibition of acetylcholinesterase receptors in the insect central nervous system, thereby blocking the normal conduction of the insect central nervous system, causing paralysis and death of pests), thiamethiazide has 5 major advantages:
(Thiamethoxazine can control thrips)
Thiamethoxazine is more active
The main metabolite of thiazide in insects is thiazide, which has a higher affinity for insect acetylcholine receptors than thiamethoxam, and therefore has higher insecticidal activity;
The hydroxylated metabolite activity of imidacloprid was reduced.
(Thiamethoxazine can control whiteflies)
Thiamethoxine has a high solubility in water
Thiamethoxine is 8 times more soluble in water than imidacloprid, so even in arid environments, it does not affect the absorption and utilization of thiamethoxine by wheat.
Studies have shown that in normal moist soils, thiamethoxine shows similar control effects to imidacloprid, but in drought cases, it is significantly better than imidacloprid.
(Thiamethoxazine can control aphids)
Levels of thiamethoxam resistance are low
Imidacloprid has been on the market for nearly 30 years, and the resistance of pests has become increasingly serious.
According to reports, brown flying wind, cotton aphids, leeks late-eyed Qin mosquitoes, etc. have developed a certain resistance to it.
The risk of interaction between thiamethoxine and imidacloprid on pests such as brown planthoppers and cotton aphids is very low.
(Thiamethoxazine can control leafminer moths)
Thiamethoxazine can enhance the stress resistance of crops and promote crop growth
Another advantage of thiamethoxazine that other pesticides cannot match is that it has the effect of promoting roots and strengthening seedlings.
Studies have shown that thiazide can activate plant stress-resistant proteins, while the plant body auxin, cytokinin, gibberellin, abscisic acid, peroxidase, polyphenol oxidase, phenylalanine lyase effect, thiotoxazine in turn to make crop stems and roots more robust, enhance stress resistance.
(Thiamethoxazine can control pyllids)
Thiamethoxazine is longer effective
Thiamethoxine has strong leaf conductivity and root aspirability, and the agent can be quickly and fully absorbed.
When it is applied to soil or seeds, thiamethoxine is quickly absorbed by the roots or newly sprouted seedlings, and transported upwards through the xylem of the plant to the various parts of the plant body, where it remains in the plant for a long time and degrades slowly, while its degradation product, thiamethoxam, is more active, so thiamethoxine has a longer effective period than imidacloprid.
Thiamethoxine control objects
1． Control of rice planthoppers Per mu with 25% thiamethoxine water dispersion granules 1.6 to 3.2 g (active ingredient 0.4 ~ 0.8 g), sprayed in the initial peak of nymph occurrence, spraying 30 to 40 liters per mu, directly sprayed on the leaf surface, can be quickly transmitted to the whole rice plant.
2． Control of apple aphids With 25% thiamethoxine 5000 to 10000 times liquid or per 100 liters of water plus 25% thiamethoxazine 10 to 20 ml (effective concentration of 25 to 50 mg / L), or foliar spray of 5 to 10 g (active ingredient 1.25 to 2.5 g) per acre.
3． Control of melon whitefly use a concentration of 2500 to 5000 times, or spray with 10 to 20 grams (active ingredient 2.5 to 5 grams) per mu.
4． Control of cotton thrips Spray 25% thiamethiazide 13 to 26 grams (active ingredient 3.25 to 6.5 grams) per acre.
5. Control of pear lice Spray with 25% thiamethoxine 10,000 times liquid or add 10 ml (effective concentration of 25 mg/l) per 100 liters of water, or spray with 6 grams (active ingredient 1.5 g) per mu of orchard.
6． Control of citrus leafminer moth Spray with 25% thiamethoxine 3000 to 4000 times liquid or 25 to 33 ml (effective concentration 62.5 to 83.3 mg/L) per 100 liters of water, or 15 g (active ingredient 3.75 g) per mu.
Recommended dosages for common crops
Crops Typical pest Seed treatment
Potatoes Potato peach aphid, potato long tube aphid, potato leaf aphid 4-7.58Al/kg
Soybean Stemechus Subsignatus, Ceretoma Arcuata, termites 17.5-150gAl/kg
Rice weevil, planthopper, South American corn seedling spot borer 50-100gAl/kg
Cotton Cotton aphid, smoke thrips, whitefly, forage blind bug, grey borage 70-350 gAl/kg
Corn nematodes, Aphids, wheat stalk flies, black isocane tortoises 40-315gAl/kg
Grain Grain Aphid and Nematodes 35-70gAl/kg
Beet Peach aphid, Bean spear aphid, Concave tibia, Beet Spring Fly 60eAl/100 grains
Sorghum Corn tube aphid, nematode, wheat fork aphid 100-200gAl/ke
Rape cabbage aphid 400-420gAl/ks
Beans Pulse Spear Aphid 52gAl/kg
Sweet potato meal lice 70-1008Al/kg
Sunflower peach aphid, bean spear aphid, cotton aphid 350eAl/ke
Peanuts Peanut Thrips 150-200gAl/ke
The above comparison can be seen that thiamethoxam has obvious advantages in biological activity, water solubility, resistance, promotion of crop growth, and effectiveness, and thiamethoxam is better.
Source: Farmer Farming