Due to the large temperature difference and high humidity in the greenhouse, the fruits and vegetables grown in greenhouses are prone to downy mildew. This kind of bacteria spreads fast, does serious damage, and is difficult to eradicate.
Downy mildew is most common on vegetables such as cucumbers, melons, loofahs, bitter gourds, cabbage, and spinach, and is also the most difficult to control.
In addition to strengthening the temperature and humidity management in the shed, medication is also the key to preventing downy mildew. Today, I will introduce to you a special medicine for preventing and treating downy mildew. It is propamocarb hydrochloride. Let’s find out together.
Downy Mildew
What is propamocarb hydrochloride?
Propamocarb is a high-efficiency fungicide developed by Bayer. From the chemical structure point of view, it is a carbamate fungicide. Propamocarb inhibits the biosynthesis of phospholipids and fatty acids in the cell membrane of pathogenic bacteria, thereby inhibiting the growth of mycelia, the formation of sporangia and the germination of spores to achieve the effect of killing bacteria.
Propamocarb Hydrochloride
The mechanism of action of propamocarb hydrochloride is unique, and there is no cross-resistance with other ovicidal agents.
Propamocarb has good systemic conduction and can be absorbed by roots, stems, leaves, and other parts of crops. It can be transmitted to various parts of the plant to achieve the purpose of killing bacteria in various parts and has a good killing effect.
Propamocarb has a better protective effect and is suitable for use in soil treatment, seed treatment, and foliar spraying, and the treatment effect is more thorough.
Downy Mildew Leaf Infection
What diseases can propamocarb hydrochloride prevent?
Propamocarb hydrochloride is a broad-spectrum fungicide that is effective against oomycete diseases of almost all crops.
Propamocarb can be used in cucumbers, watermelons, melons, tomatoes, peppers, eggplants, cabbages, radishes, kale, tobacco, grapes, and other crops.
Propamocarb has special effects on downy mildew, blight, and damping-off, and can also control black shank, blight, late blight, cotton rot, white rust, downy mildew, rhizome, and other diseases.
Downy Mildew Root Infection
What are the characteristics of propamocarb hydrochloride?
propamocarb hydrochloride has good systemic conductivity, soil treatment can be quickly absorbed by the root system of crops, transported upward to the whole plant, after spraying, can be quickly absorbed by leaves, quickly play a role in protecting leaves.
The rapidity of propamocarb hydrochloride is also very good, after spraying, it can be quickly absorbed by the stems and leaves of crops, and it can be effective after a few hours, especially for downy mildew and epidemic control with rapid transmission speed The effect is very prominent.
propamocarb hydrochloride is very safe for crops and will not cause pesticide damage even when used in the most sensitive situations such as seedling, flowering and young fruit stages.
The mixability of propamocarb hydrochloride is very good, and it can be mixed with enoylmorpholine, chasmomycin, fluylamin, fluodinamide, difenoconazole and other agents, and the synergistic effect is obvious.
Techniques for the use of propamocarb hydrochloride
Foliar spray: This is the most common method. In the initial stage of downy mildew and blight of cucumbers, melons, grapes and other crops. Use 722g/L propamocarb hydrochloride SL 900-1500ml/ha, and spray evenly on the leaves to quickly control the continuous damage and spread of the disease.
Soil treatment: in the cultivation of peppers, cucumbers, melons, tomatoes, eggplants, etc. Use 722g/L propamocarb hydrochloride SL 5-8ml/m² to water the seedbed, water the seedbed when sowing, and before transplanting the seedlings. The amount of medicinal solution per square meter is 2-3 liters, so that the medicinal solution can fully reach the roots, and keep the soil moist after watering, which can effectively prevent cataracts, root rot and other diseases at the seedling stage.
Root irrigation: In the early stage of tobacco black shank and other diseases, 25% metalaxyl + propamocarb HCl WP 80-100 g/mu can be used for root irrigation. It controls the spread of the disease rapidly and is safe for use in tobacco with an interval of 21 days.
The presentation of Downy Mildew
Precautions for using propamocarb hydrochloride
Special reminder,propamocarb hydrochloride and propamocarb is not the same agent, propamocarb hydrochloride water solubility is better, faster movement in the crop body, it is recommended to prefer propamocarb hydrochloride in the prevention and control of downy mildew, blight, cataplexy and other diseases.
In order to avoid or delay the emergence of drug resistance, propamocarb hydrochloride is mixed with agents with different mechanisms of action as much as possible, which not only has a wide bactericidal spectrum, but also delays the resistance of pathogens.
Downy Mildew of Bitter Gourd
Pay attention to the current use when using, and prepare according to the second dilution method. propamocarb hydrochloride cannot be mixed with copper preparations and alkaline agents, otherwise the efficacy will be reduced!
Pay attention to the protection of beneficial organisms when using, and avoid affecting the surrounding bee colonies when applying. It is forbidden to use near flowering plants, silkworm rooms, and mulberry gardens. Keep away from aquaculture areas, and do not wash pesticide application equipment in rivers, ponds and other water bodies.
Conclusion
Future trends in disease control
In the future, the prevention and control of oomycete diseases also require the development of green chemical pesticides with new mechanisms of action and efficient biological pesticides.
For the control of diseases, it is necessary to combine the use of disease-resistant varieties, soil disinfection, disease-resistant seedling breeding, and initial pharmaceutical prevention and control, and truly use the least amount of agents to not only prevent and control diseases well but also ensure the safety of vegetable products.
