The main pests and diseases in the late rice season are:
1. Sheath blight: Shed blight has recently accelerated her condition, with an average disease rate of 13.7% and a diseased rate of 3.3%. The disease has accelerated significantly from the previous period, especially the Wuyun glutinous series, and the sheath blight is generally heavier. According to the current temperature and rice growth period, the recent disease rate and disease rate will continue to rise.
2, five generations of gray planthoppers: this year, the density of gray fly locusts has remained high. The average amount of worms is 20.6, and the amount of insects in the field is high. It is the base of depression, alleviating the degree of damage in the late stage of rice, and reducing the number of worms in the next year.
3, four generations of brown planthopper:
The second and third generations of brown planthoppers have a moderate degree in this city, but the threat of four generations of brown planthoppers still exists. On September 10, the plant protection station fixed the number of Tianbai worms at 24.6 heads. On September 9th, the towns were censused. The average number of worms was 7.9, especially for some worms that were not used in the prescription. Has a serious impact.
4, four generations of vertical leafhopper: four generations of vertical leafhoppers are still high in the field, the number of eggs in the town is investigated, the average number of eggs is 170.4, the number of insects is 20.4, the number of eggs is 150, In particular, some late-planting live-seeded rice is still likely to be eaten white.
5. Rice seedlings are extremely beneficial to the occurrence of pests and diseases. The rice varieties planted are large-ear and round-rod varieties, which are prosperous and green, with large growth and high degree of canopy closure in the field, which is conducive to the feeding and spawning of rice planthoppers;
In particular, the Wuyun ç²³ series of varieties, the late sheath blight rises very fast; the late-breaking varieties such as direct seeding rice, the leaves are green, the upper functional leaves are long, and the growth period is late, which is extremely beneficial to the damage of the vertical leafhopper.
6. The abnormal temperature is conducive to the occurrence of pests and diseases. Since September, the temperature has been high, and the average temperature in early September was 26.0, which was significantly higher than that of normal years. According to the forecast of the meteorological department, the temperature in mid-September was still high, giving a large number of four generations of brown planthoppers and five generations of gray planthoppers. Blight has created very favorable conditions. Late rice pests and diseases can be controlled by the following methods:
1, medication time: around 10 am, around 3 pm.
2, medication methods: according to the local cultivation forms, main plant varieties, reproductive process, classification guidance to ensure control effects.
(1) Large area conventional rice. Use 25% pymetrozine suspension agent per acre, add 5% jinggangmycin 400 ml, mainly attack rice planthopper, sheath blight;
(2) Direct seeding rice, conventional rice green field, and late growth stage, using 25% pymetrozine suspension 20g plus 40% diazine, phoxim 80ml and 5% Jinggangmycin 400ml per acre. The main attack is rice planthopper, vertical leafhopper, and sheath blight. For some special fields, 20% Dingjing Jinggang. Tricyclazole suspension agent 100g is used to control panicle neck. The above formula is sprayed with 50-60 kg of small machine spray per acre, or 150 kg of water with “Workerman 36â€. In particular, the field of pymetrozine, which was not used in August 22-23, was the focus of this drug.
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