50% Diethofencarb·Carbendazim Wettable Powder, registered for ginseng gray mold (100-130 g/mu) and tomato gray mold (100-150 g/mu), spray application.
Two crops, one disease, comparable application rates. This article focuses on tomato gray mold — because it is one of the most typical diseases of protected vegetables.
Carbendazim: A benzimidazole systemic therapeutic fungicide that interferes with fungal mitosis.
DiethofencarbDiethyl imide compounds,It remains active against Botrytis cinerea strains that have developed resistance to benzimidazoles.请提供需要翻译的中文段落内容。
The purpose of the combination isResistance hedgingCarbendazim controls sensitive strains, while diethofencarb controls resistant strains.
Product performance statement: "Inhibits the formation of the spindle in Botrytis cinerea spores" — this is the shared target site (cell division) of the two, but their modes of action differ, so resistant strains can be covered by diethofencarb.
The first peak incidence period: from flowering stage to fruit-setting stage.
The main portals of pathogen infection areResidual petalsAfter tomato flowering, the petals senesce but do not abscise immediately, adhering to the young fruit or pedicel. The petals are nutrient-rich and serve as ideal colonization sites for Botrytis cinerea.
This pattern dictates that pesticide application must be carried out during the flowering stage, and the spray must reach the floral organs.
The second peak period: after consecutive overcast days.
Gray mold is extremely sensitive to humidity.Prolonged overcast days, poor ventilation inside the greenhouse, and extended periods of leaf surface condensation., is a direct signal of a disease jump.
In agricultural production, there is a practical criterion:After two consecutive overcast days, pest and disease control should be put on the agenda.— This often occurs earlier than the appearance of visible lesions.
Lower limit 100 gRoutine prevention: when the weather is clear and humidity inside the greenhouse is controllable.
Maximum limit 150 gAfter consecutive cloudy days, when scattered disease spots have appeared, or when humidity inside the greenhouse is difficult to control.
Registration clarification:The fruit, leaf surface, and underside of the leaves of tomato plants should all be sprayed.请提供需要翻译的中文段落内容。
Gray mold mainly damages the fruit, and fruit infection often starts fromAttachment site of residual flowersStart. So:
Spray should be directed at the young fruit, especially the remnants of flowers between the fruit stalk and the sepals.
This is a blind spot for many: spraying only the foliage and not the fruit will greatly reduce control efficacy.
Other key areas请提供需要翻译的中文段落。
- Leaf underside (high humidity)
Old leaves at the lower part of the plant (the earliest to be infected)
- Wounds on the stems and the broken ends of fruit stalks after fruit picking
Registration: once every 10 days.
Gray mold develops rapidly under high-humidity greenhouse conditions, and 10 days is the practical interval for maintaining protection. During prolonged overcast and rainy weather, the interval should be shortened to 7 days.
This point is more important than the pesticide itself.
Gray mold is essentiallyEnvironmental diseaseHigh humidity, poor ventilation, and prolonged leaf wetness inside the greenhouse will undermine the efficacy of any pesticide, no matter how good it is.
Supporting measures:
Ventilate to reduce humidity after pesticide application (but ensure nighttime insulation).
Reduce watering and switch to drip irrigation or subsurface irrigation under plastic film.
Promptly remove diseased fruits, diseased leaves, and spent flowers.Take it outside the greenhouse for disposal.
Reasonable close planting
Mulch the ground with plastic film to reduce soil moisture evaporation.
Removing diseased and senescent plant material directly reduces the base level of inoculum, and its value often exceeds that of applying an additional round of fungicide.
The registration also includes ginseng (100–130 g/mu). Ginseng is cultivated under shade sheds, where high humidity and poor ventilation create an ideal environment for gray mold.
The Particularity of GinsengPerennial, slow-growing, with high root value. Once the disease occurs, it not only reduces yield in the current year but may also affect subsequent years. Therefore, the key to controlling ginseng gray mold lies inPreventionProtection should begin at the leaf expansion stage.
ResistanceAlthough diethofencarb was designed for resistant strains, resistance to it has also been reported. It should not be used alone over an extended period; instead, it should be rotated with fungicides of other modes of action (strobilurins, anilinopyrimidines, SDHIs, and microbial-derived fungicides).
Carbendazim exhibits cross-resistance with thiophanate-methyl and benomyl.Rotation cannot be alternated among these three.
Mixing incompatibilityDo not mix with strongly alkaline pesticides or copper-containing formulations.
Mixing pesticides: Secondary dilution.
The pre-harvest interval for tomato is 5 days, with a maximum of 2 applications per season.
Continuous harvesting of tomatoes with a 5-day interval is relatively feasible. However,2 applications maximumThis means it cannot be used as the primary option throughout the entire season.
Two applicationsFirst application at flowering stage (to cut off petal infection routes), second application after consecutive cloudy days. Thereafter, rotate to fungicides with different modes of action (e.g., pyrimethanil, boscalid, Trichoderma).
Precautions: "Attention should be paid to the effects on bees during use.Do not use during the flowering period of nectar-source crops.请提供需要翻译的中文段落内容。
Diethofencarb and carbendazim are toxic to bees. Although tomatoes are primarily self-pollinating, if bumblebees are introduced into the greenhouse for pollination (which is now quite common), pesticide applications should be timed to avoid periods of bee activity.
In practiceApply pesticides in the evening when the bee colonies have returned to the hive; alternatively, move the beehives out one day before application and move them back 2-3 days after application.
This product must not be mixed with copper-based or strongly alkaline pesticides.After spraying copper, mercury, or alkaline pesticides, this product should only be applied after an interval of one week.请提供需要翻译的中文段落内容。
Copper-based fungicides (such as copper hydroxide) are commonly used on tomatoes to control bacterial diseases (bacterial spot and bacterial canker). After applying copper-based fungicides, an interval of one week should be left before applying this product.
Why?Copper ion residues can react with carbendazim, reducing its efficacy; alkaline substances can cause carbendazim to decompose.
Precautions: "Avoid extensive and excessive consecutive use."
This point addresses resistance — although diethofencarb was designed for resistant strains, resistance to it has already been reported. Continuous use will accelerate the development of resistance.
Not for use by individuals with allergies.Seek medical attention promptly if any adverse reactions occur during use.
Incineration and deep burial of packaging materials...and must not be discarded at will.
Do not clean application equipment in rivers, ponds, or other water bodies.
