The formulation of Lanfeng Hemei is 5% pyraclostrobin + 55% metiram, with a total content of 60%, and the formulation type is water dispersible granules.
Register two targets, with the application rate differing by a factor of two:
Apple tree Alternaria leaf spot1500-2000 times dilution
Pomegranate tree bark roughness disease2000-3000 times dilution
For the same product and similar disease types, why is there such a large difference in concentration?
5% versus 55% — this ratio is highly disproportionate. It determines the precise positioning of the product:
The protective action of metiram constitutes the absolute main body, while pyraclostrobin provides only a small proportion of penetrative assistance.
Product performance description:
It has the functions of preventing pathogen invasion, inhibiting pathogen spread, and eliminating pathogens within crops.
"Preventing invasion" comes from the protective effect of metiram, while "eradicating internal pathogens" comes from the systemic action of pyraclostrobin; however, the latter accounts for a small proportion, so the overall effect remains primarily protective.
This point is very important.It should not be used as a curative agent simply because it contains pyraclostrobin. Its value lies in protective coverage before disease onset.
Metiram belongs to the organic sulfur multi-site protectant fungicides. Its mechanism of action involves interfering with multiple enzyme systems of pathogenic fungi, thereby inhibiting spore germination and germ tube development.
Three characteristics:
你只提供了“1.”，没有附上需要翻译的中文段落。请把中文段落发给我，我会只返回英文译文。Multi-locusThe pathogen would need to undergo multiple mutations simultaneously to develop resistance, so the resistance risk is extremely low.
It appears that only "2." was provided, with no Chinese paragraph to translate. Please send the Chinese text you'd like translated into English.Zinc-containing(Metiram is a dithiocarbamate compound) and has an auxiliary effect on leaf health.
3.Protective, no systemic translocation, must be applied as a protective cover before pathogen contact
Metiram accounts for 55% of the formulation and is the main contributor to efficacy.
Apple alternaria leaf spot, 1500-2000 fold dilution.
Apple alternaria leaf spot mainly damages leaves, especially the young leaves of spring and autumn shoots. Apple leaves are relatively thick with a well-developed cuticle, making it comparatively easy for spray droplets to adhere; however, given the large leaf size and dense canopy, sufficient concentration is required to ensure coverage of the inner canopy.
Pomegranate tree mottled bark disease, 2000-3000 fold dilution.
The rough bark disease (also known as pomegranate stem borer or trunk and branch disease, subject to registration) mainly damages branches, trunks, and fruit surfaces. Pomegranate branches and trunks are relatively smooth, and the fruit surface (peel) has a dense but even structure, allowing spray solutions to spread easily, so effective coverage can be achieved even at low concentrations.
Core logic: The pesticide deposition performance on the target surface determines the concentration.For surfaces that are smooth and easy to wet with spray deposits, a lower concentration may be used; for surfaces that are rough, densely hairy, or heavily waxed, a higher concentration is required to compensate.
The last item of the registration technical requirements:
Before promoting its use, a small-scale crop safety trial should be conducted on pomegranate trees.
This is not a courtesy remark. Pomegranates exhibit differential sensitivity to dithiocarbamate fungicides in certain cultivars, which may result in fruit surface spotting or foliar reactions.When using it on a certain pomegranate variety for the first time, spray a few trees first and observe for 3-5 days.Confirm there is no phytotoxicity before applying it on a large scale.
The very existence of this notice indicates that the safety data for this crop variety were insufficient at the time of registration. Users should take it seriously.
Compared with wettable powders, water-dispersible granules (WG) offer several practical advantages:
Dust-free.Pouring pesticide without generating dust is safer for the mixing personnel.
Convenient measurement.Good particle flowability, easy to weigh.
Good disintegrability.It disintegrates and disperses rapidly upon contact with water, with no tendency to clump.
More compact packaging and transportation.For the same active ingredient, the volume is smaller than that of a suspension concentrate.
Usage: Add water to a large container first, pour in the granules, stir until completely disintegrated and dispersed, then top up with water to the required volume.Do not pour directly into the sprayer and then fill with water., making it prone to uneven disintegration and nozzle clogging.
Apple: Apply at 10-day intervals, with a maximum of 3 applications per season. The pre-harvest interval is 14 days.
Pomegranate: Apply at 10–14 day intervals, with a maximum of 3 applications per season; pre-harvest interval 28 days.
The 14-day interval for apples versus 28 days for pomegranates shows a marked difference. The harvest period for pomegranates differs from that of apples, and the 28-day interval means that the final pesticide application must be planned in advance.
3 times per seasonAs a protectant-oriented formulation, the 3-application schedule typically follows a pattern of "one basal application before the rainy season + two maintenance applications during the rainy season."
Metiram accounts for 55%, which is the source of this product's resistance-management value—a multi-site protectant can significantly dilute the selection pressure of pyraclostrobin.
However, it should be noted that pyraclostrobin belongs to the strobilurin (methoxyacrylate) class and carries a high risk of resistance. The same formulation should not be applied repeatedly within a single season; during critical periods, fungicides with different modes of action, such as triazoles and copper-based products, should be introduced.
