I. Occurrence and degree of rape pests and diseases 1. Sclerotinia Sclerotinia: On March 5th, the incidence rate of one type of seedlings was 18-22%, that of the second type was 4-5%, that of the third type was 2%, and the weighted average leaf disease rate was 10.7%. It is estimated that the occurrence of Sclerotinia sclerotiorum in this year will be 4-5 grades, with 5 grades in local areas. Mainly based on: Last winter, no obvious low-temperature cold weather was observed in the spring of the year, especially in mid-February, the temperature was significantly higher than the same period of the previous calendar year, the germination time of the field sclerotia was early, and the early stage of the sub-capsule was February 21, 5 years earlier than last year. Days, 12 days earlier than the calendar year. The onset of spring field leaf disease began on February 5, 24 days earlier than last year. The rate of onset of diseased leaves was 1.5%, the same as last year. The early continuous low temperature and rain, the humidity in the field, rape seed capsule disk germination is slow, but after the temperature rises, the ascidian plate germinates rapidly, the field apex of the ascidian disk coincides with the early flowering period of rapeseed, and the extremely pathogenic bacteria infect. Due to the large area of ​​rapeseed in our city, the bacterial source base is high. Rapeseed has a high chance of flowering during the flowering period, and the spread and spread of the disease is quick and the loss is large. 2. Rape locusts: On March 5th survey, a class of seedlings had locust strain rate of 85%, class II seedlings of 85-90%, class 3 seedlings of 95%, with an average of 85-90%. There are 1,200 seedlings, 1,600 seedlings of the second type and 2,200 seedlings of the three types, with an average of 1800 heads. 3. Plutella xylostella: Due to high temperatures in the spring and early winter, the occurrence of Plutella xylostella was early, and the average number of insects was 4-6. 4, rape downy mildew: This year is slightly lighter than the calendar year, the current survey of the average leaf disease rate of 8-10%. Second, prevention and treatment time According to the growing trend of the fields, they were controlled once at the early flowering stage and at the flowering stage respectively. The first time of prevention and treatment was March 10-15, and the second time was March 20-25. Third, comprehensive prevention measures 1. Raise awareness, strengthen leadership, provide timely guidance, and implement various measures. 2. Clean up "Three Ditches" in time to reduce moisture and prevent stains. 3, timely removal of old leaves, yellow leaves, diseased leaves in the field, and bring them out of the field for centralized treatment. 4, do a good job of chemical control 1A per mu using Sanda grams 60 grams full house red 20 grams. 2 Use 60-80 grams of synergistic carbendazim per acre plus 60 ml of Gong De Le. 3 150 grams of sclerotia net per acre and 10 grams of astragalus. The above formula optional group of borax 2 two, watered 50 kg uniform spray. (Hubei Dangyang Agriculture 110 Zhu Liqing)
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