Sclerotinia sclerotiorum is one of the major diseases in rapeseed production in our region. The severity of the occurrence is related to factors such as planting species, climatic conditions, and bacteria source. Once the disease occurs, it will cause a reduction in production in different degrees. Therefore, all towns and sub-district offices should attach great importance to actively doing a proper job of preventing Sclerotinia sclerotiorum in order to ensure the high yield and stable production of rapeseed.
First, the trend
The rape planted in our district was Qinyou 10 and Qianyou 737 as the main varieties, and both varieties were not resistant to Sclerotinia sclerotiorum. In addition, the weather in autumn last fall till the end of November was more conducive to the emergence of young seedlings, rape grow green, encountered several cold spells in December, resulting in serious frost damage in rape, resulting in very uneven birth process in spring, some early-onset rape has entered the early flowering period, Large areas will also enter the flowering period of bolting, and it is expected that large areas of rapeseed will enter the early flowering period from the end of March to the beginning of April, and will enter the flowering period in early April. According to my station and related towns surveyed on the 15th to 19th of March, there were 28 rapeseed fields with an average leaf disease rate of 7.96 (0-24)%, which was slightly lower than last year's 8.09%, but higher than the previous year's 6.77%. If rainy seasons meet with rainy weather, it will be conducive to the harm caused by Sclerotinia sclerotiorum pathogens. It is predicted that S. sclerotiorum disease will still be moderate to heavier this year, and some heavy forage fields and unsuccessful prevention and control are likely to be large. occur.
Second, prevention advice
In view of the recurrence trend of Sclerotinia sclerotiorum this year, all towns and sub-district offices must fully publicize the launch. Based on the prevention and control of agriculture, the prevention and control of pharmaceuticals is the dominant strategy, and the prevention and control strategies of "proactive attack, appropriate drug use, mixed application of drug and fertilizer, and simultaneous treatment of diseases and pests" are adhered to.
1 Agricultural control
Strengthen the field management, clear the ravine, and ensure the smooth flow of the gully; remove the old yellow disease leaves from the base and carry it out of the field for centralized treatment to improve the ventilation and light transmission conditions among the plants, increase the resistance of plants, and reduce the amount of bacteria in the field.
2 Chemical control
Control period: All the main stems of rapeseed flowering about 80% fully use the first time the medicine, after the rain or high humidity weather, use the second time every 5-7 days, especially the high yield side, heavy field and In the last year, the onset was heavy.
Control agent: 50% Prochloraz Manganese Salt Wettable Powder 30-40g or 30% Pentoth Wettable Powder 100g plus 35% imidacloprid Suspension (Shiyue) 10-15g per acre (both aphids) plus Boron 100 grams of fine spray on water 30 kg.
Note: In order to ensure the control effect, sclerotinia disease has become resistant to carbendazim and other agents, and it is necessary to change to agents with good efficacy. When using pesticides, use sufficient amount of water to ensure that the liquid to be sprayed to the lower part of the plant and rain within 4 hours after the drug.
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