Yard Fungicide Buying Guide

According to the survey, there are more than 80,000 kinds of pathogenic microorganisms (fungi, strong bacteria, rickettsia, mycoplasma, viruses, algae, etc.) harmful to plants all over the world. Plant diseases cause huge losses to agriculture, and crops around the world are thus reduced by an average of about 500 Mt per year.

In history, there have been many disasters caused by a certain plant disease epidemic, causing severe famine and even starving a large number of people. The use of fungicides is a cost-effective method of controlling plant diseases.

The insecticidal or bactericidal virulence of the agent, commonly referred to as "lethal dose", means that the dose required to kill half (50%) of the biological population (median lethal dose, mg/kg) is often abbreviated as LD50. If the concentration represents a dose, it is "lethal concentration", abbreviated as LC50. The bactericide is expressed as ED50 or EC50, ie the dose or concentration required to inhibit 50% spore germination.

Spore germination assay

Different liquid medicines are sprayed on the surface of the slide or the plate, and the spore suspension is quantitatively added. After the liquid is contacted, the percentage of spore germination is examined by a certain culture time.

Inhibition zone

Mix the suspension of the spores or hyphae of the pathogen with the agar medium, and after condensing, place a circular filter paper (about 6 mm in diameter) that is sterilized and has different concentrations of the drug solution on the plane of the medium. After the time, due to the diffusion of the drug solution, the growth of the pathogen is inhibited, that is, a "suppression circle" is formed. The size of the suppression ring was measured to compare the virulence of the biocide.

Growth rate assay

The drug solution was added to the agar medium, and the bacteria were condensed, and after 24 to 48 hours, the colony growth was observed, and the growth rate was calculated and compared with the growth rate of the control group containing no drug.

The market speed of pesticide active ingredients has slowed down considerably compared with the past. Among them, the herbicides have the most obvious decline rate, and the pesticides have also decreased to some extent. However, the new fungicide market introduction performance is very strong, especially in recent years.

In 2009, there were 17 new pesticides released globally, and 9 bactericides, more than 50%, 3 of which were amides, 3 were strobilurin compounds, and 1 triazolyl pyrimidine. A compound, a quinoline compound, and an antiviral agent, fluorophosphorus. During the "11th Five-Year Plan" period, a total of 34 pesticide varieties with independent intellectual property rights obtained pesticide registration licenses, including 17 fungicides, occupying half of the country. The main varieties are flumorph, enestrox, pyridine, Isoprofen, gold nucleoside, and the like.

Reasons for good biocide production and application prospects

1. The degree of agricultural intensification is continuously strengthened;

2. The extreme climate has frequently stimulated the demand for the biocide market;

3. The demand for fungicides in the non-pesticide field continues to increase at a high speed and the profit margin is large;

4. The patent for some high-efficiency fungicide varieties will expire during the "Twelfth Five-Year Plan" period;

5. During the "Twelfth Five-Year Plan" period, the state continued to increase its encouragement of technological innovation. The varieties of fungicides with independent intellectual property rights will be continuously developed and put into the market;

6. The growing area of GM crops will have a negative impact on pesticides and herbicides, but has little effect on fungicides.

Wheat scab is a common disease in the world, which mainly causes seedling blight, ear rot, stem base rot, stem rot and ear rot. it can be damaged from seedling to heading, and the most serious one is ear rot, which is one of the most serious diseases in wheat.

What fungicides can be used to control it?

Carbendazim is a kind of benzimidazole fungicide, which is effective to many ascomycetes and Deuteromycetes. Therefore, carbendazim has a high control effect on wheat scab. It is the first traditional medicine to control wheat scab with low cost.

Thiophanate methyl, like carbendazim, is a kind of benzimidazole fungicide. It can be transformed into carbendazim in plants, which interferes with the formation of spindle body and cell division. Therefore, its control mechanism is similar to carbendazim, but compared with carbendazim, it has stronger absorption and longer lasting effect. For infected plants, the control effect was better than carbendazim.

Tebuconazole has good control effect on powdery mildew, rust and other diseases. Tebuconazole is an effective and suitable drug to control wheat scab. Reasonable use of Tebuconazole has a good control effect on wheat scab, and it is one of the ideal fungicides to control wheat scab.

Through the combination of different active ingredients, it is the most common and direct means to control wheat scab, and it can delay the development of fungicide resistance

The compound product with high efficiency for wheat scab is a powerful supplement to the fungicide for controlling wheat scab.