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one. The rice leaffolder was affected by the typhoon weather in the early stage and the recent cold air impacted southwards. The worm continued to move into the late rice, resulting in a large amount of insects in the field and complex worms, causing an imbalance. At present, the adult density is generally 3,000-5,000 heads/mu, with individual populations reaching 15,000 heads/mu, and the population density is 3-5 times that of the same period of last year. It is expected that the mid- and late-stage populations will be moderately heavy and locally heavy.
two. The planthoppers in the mountainous area of ​​Zhaoqing City are more prominent. The current density is 350-500 heads per hundred bushes and the height is 1500 heads per hundred bushes. Under the influence of the recent cold air southwards, rice planthoppers have continued to move into the city, and it is expected that in the latter half of the year, emphasis will be placed on partial re-emergence.
three. Currently, the general population density of SHUHU is 1-5 groups/mu, and that of individual towns in Gaoyao City is 13-22 groups/mu. It is expected that the third generation of S. sinensis will be moderate and local.
4. Sheath blight occurs due to the accumulation of bacteria in the field, coupled with the high temperature and high humidity in the field environment. The general diseased rate in mountain areas is 2-10%, and weight is above 15%. It is expected that the middle and late periods will be biased.
Fives. The diseases in the old wards of rice blast and bar-breaking mountainous regions are more prominent. In the towns of Nanfeng, Baiqu, and Yuchao in Fengkai County, the diseased leaf rate is generally 0.5-3%, and the general sickness rate in Guangning County is 1.5-10%. More than 40%. Due to partial land bunkering, some mountainous towns have a thin strip disease. Generally, the diseased leaf rate is 3-10% and the weight is 28%.
Prevention opinion:
Strengthen the management of field fertilizer and water, improve the resilience of rice strains; grasp appropriate prevention and control, and use drugs scientifically. The first application time: September 17-22, the second application time: September 28-10 October. Prevention and treatment of rice blast should pay attention to the spraying period and the heading period.
Pharmacy selection: control of rice leaf roller can be used Ruijin special, Le Siben, Bataan, insecticide double, etc., control of rice planthoppers can be used darts, pupate Ling, acetamiprid, etc., to prevent sheath blight optional love Miao, streptomycin, Jinggangmycin and other agents, for the prevention and treatment of panicle blast disease can use Fuji No. 1, additional rice, ignorant of the new (Kai Xing Xing), tricyclazole and other agents, prevention and treatment of fine striasis can be super copper, Ye Qing double.
Zhaoqing Late Rice Pest Prevention and Control
According to the current occurrence and weather conditions of late rice in Zhaoqing City, combined with historical data analysis, it is expected that the late-middle-stage pests of late rice mainly include: rice leaf roller, rice planthopper, rice stem borer, rice sheath blight, rice blast disease, and fine strip disease. .