50% Thiophanate-methyl·Thiram Wettable Powder, registered for wheat Fusarium head blight, 120-160 g/mu, spray.
From the formulation perspective, this is a combination designed to target "resistance":Systemic agent + multi-site protectant请提供需要翻译的中文段落内容。
Thiophanate-methylBenzimidazoles are converted to carbendazim in plants, interfering with spindle formation during fungal mitosis. Systemic and curative.Higher resistance risk.Resistance of Fusarium graminearum to benzimidazoles has been explicitly reported in wheat-growing regions of China.
Thiram: Organosulfur compounds, multi-site inhibition of the enzyme systems of pathogenic fungi. Protective.Extremely low resistance risk.Multi-site action means that the pathogen must simultaneously acquire multiple mutations to develop resistance.
The core value of the combination lies precisely here.The multi-site action of thiram dilutes the selection pressure of thiophanate-methyl, thereby delaying the development of resistance; the systemic property of thiophanate-methyl compensates for the shortcoming of thiram, which can only remain on the surface.
Fusarium head blight of wheat is caused by pathogens of the genus Fusarium. The particularity of this disease lies in:
The application window is extremely narrow.The pathogen infects the floral organs during the flowering stage, and the infection window closes once flowering is over. This means that the fungicide application period across all wheat-growing regions is concentrated within the same week or so.
Historically, chemical control has relied heavily on benzimidazole fungicides.Carbendazim and thiophanate-methyl were once the primary fungicides for controlling Fusarium head blight; however, long-term extensive use has led to the development of resistance to benzimidazole fungicides in Fusarium graminearum populations in some wheat-growing regions.
The consequences of resistant strains extend beyond reduced control efficacy., and may also lead to an increase in the production of toxins (DON).
That is why the "systemic + multi-site" combination makes practical sense: it is not the strongest treatment option, but it is a sustainable one.
Lower limit 120 gRoutine prevention: when the weather is fine during the flowering stage and disease pressure is low.
Maximum limit 160 gWhen continuous overcast and rainy weather occurs during the flowering stage, the risk of disease epidemics is high, or resistance has been reported in the region.
The flexibility of the dosage range corresponds toUncertainty regarding disease pressure and resistance levels.请提供需要翻译的中文段落内容。
First, timing.Spray at flowering, and rush to protect before rain. The early flowering stage (when the wheat ears have emerged and pollen shedding begins) is the optimal window. If the flowering stage is missed, later remedial measures will have limited efficacy.
Second, the plant part.The spray solution must reach the ears. The label states that "both the upper and lower leaf surfaces of wheat should be sprayed," but the key to Fusarium head blight control is deposition of the fungicide on the ears. When spraying, the nozzle should be directed at the wheat ears.
Third, water volume.The water volume for wheat is usually 30–45 kg per mu. Insufficient water volume results in inadequate pesticide coverage on the ears.
Registration: once every 7-10 days.
Control of Fusarium head blight usually requires only 1–2 applications.Apply once at the early flowering stage (primary control). If continuous rainfall occurs during the flowering period, apply a supplementary treatment 7–10 days later.
请提供需要翻译的中文段落。Do not apply pesticides after flowering.(For some pesticides, use after the flowering stage carries a risk of increased mycotoxin levels; the specific registration label shall prevail.)
Thiram's effects onSome young and tender tissues of certain crops may be irritated.At the wheat heading stage, it is relatively tolerant, but:
Applying pesticides during high-temperature periods (at noon) may aggravate irritation.
Excessively high concentrations may cause pesticide spots on the panicle.
Strictly follow the registered dosage; do not arbitrarily increase the rate to "enhance efficacy."
Do not mix with alkaline pesticides or copper-containing formulations.Thiophanate-methyl decomposes under alkaline conditions, and thiram may cause phytotoxicity when combined with copper.
Secondary dilution for pesticide preparationWettable powders should first be dissolved to form a mother liquor.
Applicator protection：Thiram is irritating to the skin and mucous membranes. Wear protective clothing, a mask, and gloves when mixing and applying the product.
Pre-harvest interval: 42 days; maximum 1 application per season.
This combination of the two figures is very rare among all registered products. It directly determines the positioning of this product on wheat:
It can only be used for the most critical application and should not be used as a routine rotation variety.
The period from flowering to harvest in wheat is typically 40–50 days. A 42-day interval means that:Once this application is made at the flowering stage, the next step is harvest, with no further applications possible in between.
The rationale for this restriction.The metabolites of thiram (such as carbon disulfide) dissipate relatively slowly in wheat grains, requiring a longer pre-harvest interval. The registration trial established 42 days as the safety threshold.
Practical arrangementsIf only one application can be made for Fusarium head blight control this season, use this opportunity; if two applications are needed (in case of continuous rainfall during the flowering stage), the second application must be switched to a different product.
Precautions: To prevent phytotoxicity, applications should be made in the early morning or evening during seasons with higher temperatures.
Both thiram and sulfur can be irritating to plant tissues at high temperatures. Extreme heat is typically not encountered during the wheat flowering stage (April–May), but if temperatures exceed 28°C, application at midday should be avoided.
Cannot be mixed or used together with copper, mercury, or alkaline pesticides.Continuous use in succession请提供需要翻译的中文段落。
- Copper-based fungicides (copper hydroxide, Bordeaux mixture) → Incompatible
Mercury-based formulations → phased out, but attention should be paid to historical residues.
Alkaline pesticides (such as lime sulfur mixture, etc.) → thiophanate-methyl decomposes under alkaline conditions
"Continuous use in succession" meansAfter applying the above-mentioned pesticides, do not apply this product immediately; a 3-5 day interval is required.
