Plum red spot disease is a fungal disease commonly encountered by fruit farmers in the process of planting plums, which has a great impact on the growth and development of fruit trees and the yield of plums.
In the last issue, we introduced in detail the identification and diagnosis of plum red spot disease in the field, the incidence of plum red spot disease, and how to effectively and comprehensively prevent and control plum red spot disease. In order to effectively prevent and treat this disease, we need to use highly effective chemicals, and when the "key links" or some comprehensive prevention and control measures are "ineffective", we have to use chemicals to inhibit or correct the development and spread of the disease, so as to ensure that the plum returns to normal and robust growth and development.
Picture 01~02): Plum young fruit formation stage
In this issue, Qingjiang Crane will continue to pay attention to and chat with all the teachers about the chemical prevention and control measures of plum "red spot disease", aiming to introduce and share several highly effective agents for the prevention and treatment of plum red spot disease for you in detail, and help fruit farmers manage their orchards scientifically and efficiently. I hope you like and actively participate in the interactive comments and retweet this issue.
Effect of organochlorine fungicide "chlorothalonil" in the prevention and control of plum red spot disease:
Organochlorine fungicides play an important role in the control of fungal diseases in fruit trees. Among them, chlorothalonil has been favored by the majority of fruit farmers for its broad-spectrum and efficient sterilization effect.
Chlorothalonil can effectively inhibit the growth of plum red spot fungus, prevent the occurrence of diseases, and can also treat infected fruit trees (used in combination with other agents).
Picture 03~04): organochlorine fungicide chlorothalonil
You can start the medication 15 days after the plum has flowered, 10~15 days/time, and you can use it 2~3 times in a row. Use 500~600 times of 50% chlorothalonil wettable powder, or 600~800 times of 75% chlorothalonil wettable powder, or 1000~1500 times of 83% chlorothalonil clear water dispersible granules.
Phthatricarboximide fungicide "Clodidan" is used for the prevention and control of plum red spot disease:
As a representative of phthalimide fungicides, cloxidan has a significant effect on the prevention and control of plum red spot disease. In particular, plum varieties that are sensitive to "copper" preparations.
It can destroy the cellular structure of germs, so as to achieve the purpose of sterilization. Growers can use clotodan to control and ensure the healthy growth of fruit trees during the high incidence of the disease.
It can be used within 15~20 days after the plum has fallen into flowering. It can be treated with 600~800 times of 40% Gramidan suspension, or 1000~1500 times of 80% Gramdan water dispersible granules.
Picture 05~06): Plum young fruit expansion stage
Organosulfur fungicide "Dai Senlian" is used in plum red spot disease:
As an organosulfur broad-spectrum fungicide, Dysenlian has the characteristics of low toxicity and high efficiency. It is able to interfere with the metabolic processes of pathogenic bacteria, thereby inhibiting their growth and reproduction.
Growers can use Dysen Union in combination with other agents to improve the effectiveness of plum red spot disease control.
The stems and leaves can be sprayed with 500~800 times of 70% Daisenlian water-dispersible granules and 500~600 times of 60% Daisenlian water-dispersible granules within 10 days after the plum falls on flowers.
Other high-efficiency fungicides such as thiocarbamate are used in the comprehensive prevention and control of plum red spot disease:
In addition to the above-mentioned fungicides, there are thiocarbamate fungicides such as propyl zinc, benzimidazole and substituted benzimidazole fungicides such as carbendazim and thiophanate-methyl, triazoles and triazole fungicides containing heterocyclic rings such as myconazole and difenoconazole, etc., which also have significant effects in the prevention and treatment of plum red spot disease.
Picture 07~08): Organosulfur fungicide Daisenlian
01) Concentration of thiocarbamate "zinc propylene":
500~600 times of 70% zinc propylene wettable powder, or 600~800 times of 80% zinc propylene wettable powder, or 500~600 times of 70% zinc propylene water dispersible granules, or 600~800 times of 80% propylene zinc water dispersible granules can be sprayed on stems and leaves.
02) Concentration of benzimidazole fungicide "carbendazim":
25% carbendazim wettable powder 300 times liquid, 50% carbendazim wettable powder 500~600 times liquid spray, 75% carbendazim water dispersible granules 700~800 times liquid, 80% carbendazim water dispersible granules 800~1000 times liquid spray treatment.
03) Concentration of substitution benzimidazole fungicide "thiophanate-methyl":
70% thiophanate-methyl wettable powder 800~1000 times liquid, or 75% thiophanate-methyl water-dispersible granules 800~1000 times, or 80% thiophanate-methyl water-dispersible granules 1200~1500 times liquid spray stem and leaf treatment.
Picture 09~10): triazole fungicide mycloconazole
04) The concentration of triazole fungicide "eyemycazole" and triazole fungicide "difenoconazole" containing heterocyclic rings:
12% myconazole emulsifiable concentrate 1800~2000 times, or 12.5% myconazole microemulsion 2000~2500 times, 20% myconazole suspension 3000~3500 times liquid spray, 10% difenoconazole water dispersible granules 1500~2000 times, 15% difenoconazole water dispersible granules 2500~3000 times, 37% difenoconazole water dispersible granules 6000~7000 times liquid spray, 40% difenoconazole aqueous emulsion 6000~8000 times liquid spray stems and leaves can be treated.
Fruit growers can choose the right agent for chemical comprehensive control according to their actual production situation.
The "synergistic" effect of high-efficiency compound preparations in the prevention and control of plum red spot disease:
In order to further improve the prevention and control effect of plum red spot disease, fruit farmers can also use high-efficiency compound preparations.
Picture 11~12): Pyraclostrobin and Dysen Compound
These compounds combine the advantages of different fungicides to provide a more comprehensive control of plum red spot disease.
For example, the compound of benzimidazole and triazoles, the compound of substituted benzimidazoles and triazoles, the compound of triazole fungicides, and the compound of methoxyacrylates and triazoles and substituted benzimidazole fungicides, etc., can effectively improve the control effect and reduce the occurrence of diseases.
01) Compound use of "benzimidazole agents" and "triazole agents":
The representative combination is "carbendazim" and "tebuconazole" or "difenoconazole". Use 600~800 times of 30% difenoconazole carbendazim wettable powder, 1200~1500 times of 55% difenoconazole carbendazim wettable powder, 1000~1200 times of 45% carbendazim tebuconazole water-dispersible granules, and 2000~3000 times of 80% carbendazim tebuconazole wettable powder can be sprayed on stems and leaves.
Picture 13~14): tebuconaconazole, a triazole fungicide
02) "Substitute benzimidazole agents" and "triazole agents" are used in combination:
The representative combinations are "thiophanate-methyl" and "difenoconazole", "tebuconazole" and "mycloconazole". The concentration is: 200 times of 30% thiophanate-methyl tebuconazole suspension, 500 times of 48% thiophanate-methyl tebuconazole suspension, 800~1000 times of 80% thiophanate-methyl dispersible granules, 800~1000 times of 45% difenoconazole methyl thiophanate-methyl wettable powder, and 1000~1200 times of 50% difenoconazole-methyl thiophanate-methyl thiopanate-based wettable powder.
03) Compound use of "triazole pharmacy":
The representative combination is "tebuconazole" and "difenoconazole". The concentration is: 800~1000 times of 20% difenoconazole tebuconazole water dispersible granules, and 2000~3000 times of 40% difenoconazoletebuconazole suspension can be sprayed on stems and leaves.
Picture 15~16): Methoxyphenylpropionate fungicide
04) "Methoxy acrylate agent" and "triazole agent" are used in combination:
The representative combination is "pyraclostrobin" and "tebuconazole". The concentration is: 1000~1500 times of 30% pyraclostrobin tebuconazole suspension, 2000~2500 times of 40% pyraclostrobin tebuconazole dispersible granules, and 2500~3000 times of 45% pyraclostrobin tebuconazole suspension can be sprayed on stems and leaves.
05) "Methoxy acrylate agent" and "substituted benzimidazole agent" are used in combination:
The representative combination is "pyraclostrobin" and "thiophanate-methyl". The concentration of use is: 500~600 times of 30% pyraclostrobin thiophanate-methyl wettable powder, 600~800 times of 40% pyraclostrobin thiophanate-methyl suspension, 1000~1200 times of 50% pyraclostrobin thiophanate-methyl suspension, and 1500~2000 times of 75% pyraclostrobin thiophanate-methyl wettable powder.
Picture 17~18): triazole fungicides
06) "Thiocarbamate agents" and "benzimidazole agents" are used in combination:
The representative combinations are "propylzeb" and "carbendazim". The concentration of the use is: 53% zinc carbendazim wettable powder 400~500 times liquid, 75% zinc carbendazim wettable powder 800~1000 times liquid spray stem and leaf treatment.
07) Compound use of "thiocarbamate agents" and "triazole agents":
The representative combination is "propylzeny" with "tebuconazole" and "myconazole". "Mancozeb" and "carbendazim" and other combinations. The concentrations used are:
45% zinc acrycloconazole water dispersible granules 800~1000 times, 48% tebuconazole propylene zinc wettable powder 500~800 times, 55% tebuconazole propylene zinc wettable powder 800~1000 times, 70% tebuconazole propylene zinc water dispersible granules 1500~2000 times, 60% carbendazim mancozeb wettable powder 500~600 times liquid spray, 70% carbendazinate mancozeb wettable powder 600~700 times liquid spray, 80% Carbendazim mancozeb wettable powder 700~800 times liquid spray stem and leaf treatment.
Picture 19~20): Benzimidazole fungicides
Words written at the end of the chemical comprehensive prevention and control of "plum red spot disease":
Plum red spot disease is a major problem in the growth and development of fruit trees, but through the scientific and rational use of high-efficiency agents, we can effectively prevent and treat this disease.
In the actual operation process, fruit farmers should choose appropriate pesticides and control methods according to the actual situation of their orchards and the severity of diseases.
Picture 21~22): Picture of a young plum without "red spot disease".
At the same time, it is also necessary to pay attention to the amount and frequency of use of pesticides, and the rotation of pesticides to avoid unnecessary pollution and resistance to the environment, and increase the difficulty and cost of prevention and control. Through scientific management and control, we believe that fruit farmers will be able to harvest healthy and high-yield plum fruits.