In July this year, the average rainfall in Yantai City was 467.1 mm, 305.1 mm more than normal , and the sunshine hours were between 76-150 hours, a decrease of 67-110 hours compared with the same period of the previous year . July is the needle-down and pod-forming stage of peanuts in Yantai City, which is an important period for the formation of yield. Long-term rainy weather can easily lead to the growth of peanut fields, directly affecting the number of flowers, needles and effective pods. In the recent field survey, there are mainly the following problems in the growth of peanuts in our city: First, the plant height of most peanuts has exceeded 50 cm, and the phenomenon of lengthening is widespread. If the control is not good, the late lodging will lead to a significant reduction in production. Second, the growth process of peanut pods is uneven. Insufficient illumination, after the needle is placed in the soil, sufficient and timely nutrient supply cannot be obtained, which is easy to form capsules and affect economic output. Third, some peanut fields have lighter leaf color, which is related to the damage of root system and de-fertilization in the early stage. If the effective nutrient supply is not available, it is prone to premature leaf fall and premature senescence of plants. Fourth, the incidence area of ​​net spot disease and brown spot disease has increased. In response to the above problems, it is recommended to take the following measures to reduce adverse effects:
First, continue to do the field drainage work. It is necessary to combine the rainy weather and the field to be affected by this year, and establish a more perfect field drainage system to eliminate water accumulation in the field as soon as possible.
The second is to focus on the work of chemical control and prevention. It can be used for 40-50 g per mu ( active ingredient 2.0-2.5 g ) or 20-25 g per acre , and 35-40 kg of water for foliar application. Spray evenly to avoid heavy spray, leaking spray and rain after spraying.
The third is to prevent and control pests and diseases in a timely manner. High temperature and humid environment after rain easily lead to large-scale occurrence of rhizome rot, rickets, chalk disease, leaf spot, rust, etc. It is necessary to choose reasonable control methods and pesticides for comprehensive prevention and control. Compound carbendazim 200-300 times solution or 50% carbendazim WP 1000-1500 times solution, or 75% chlorothalonil WP 600-700 times solution, or 10% difenoconazole water dispersion Granule 1500 times solution, spray once every 10 days to control leaf spot disease. For underground pests such as cockroaches in peanut fields, insecticidal lamps should be used for control in places where conditions are available ; chemical control can use 48% chlorpyrifos 250 ml- 300 ml per mu or 50% phoxim granules 0.3 kg- 0.4 kg. After diluting the appropriate amount of water, use a sprayer to remove the roots.
The fourth is to combine the pest control to carry out foliar topdressing and prevent premature aging. The foliar application of potassium dihydrogen phosphate per acre 120-150 Urea 350-400 g + g + Chlorothalonil 75% WP 70-80 g of a mixture of 35-40 kg fungicides, and even spray 2, At intervals of 10-15 days, the leaf leaf life of peanuts is prolonged while reducing leaf spot disease.
Source of information: Yantai Experimental Station Yantai City Agricultural Technology Station
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