Pay more attention to the prevention and control of diseases and insect pests in single cropping rice

The planting area of single-cropping rice in our province is 6.0143 million mu this year. At present, most single cropping rice has entered the peak tillering stage to young panicle differentiation stage. According to recent incomplete statistics, various diseases and pests in single-cropping rice fields have occurred in 2.5 million mu, an increase of 40% over the same period last year, including 1 million mu of rice planthopper, 500000 mu of rice leaf roller, 400000 mu of borer, 400000 mu of sheath blight and 80, 000 mu of rice blast.

1. Rice planthopper: the occurrence of rice planthopper is serious this year, the migration of non-local insect sources is rare in previous years, and most fields have greatly exceeded the control target. According to the observation under the lamp of Pucheng County Plant Protection Station, a total of 98936 white-backed planthoppers were induced from June 11 to July 6, which was 3.6 times that of the same period last year.

Second, the rice leaf roller: the rice leaf roller migrated less in the early stage of this year, and the number of insects in the field increased rapidly after June. The damage to the larvae of the fourth generation (3) was widespread and serious in some areas. According to the recent field survey of various monitoring sites, the average number of larvae in 100 clumps is 20 Mel 50, the number of clumps more than 100 clumps is 340, and the leaf curling rate is 3 Mel 10%. At present, most of the larvae are in the 3rd instar, which is the appropriate period for control.

Third, locusts: the occurrence of Chilo suppressalis in this year's generation is generally heavy, and Efeng is long, resulting in the occurrence of Chilo suppressalis in early-cropping single-cropping rice fields, with more insect population residue. In late June, a large number of adults of the second generation of Chilo suppressalis appeared under the lamp, and the number of insects trapped under the lamp was generally more than that of last year. The number of adults trapped by Chilo suppressalis in Xiaotao spot of Yong'an City reached 3663 from June 1 to 21, which was 76 times that of the same period last year and more than 100 times that of the whole year. At present, most areas have entered the egg hatching period of the second generation of Chilo suppressalis, resulting in a withered heart and sheath in single-cropping rice fields.

Fourth, sheath blight: sheath blight occurred seriously in the early season of this year, with more residual bacteria. The heavy rainfall in mid-late June caused the occurrence of sheath blight pathogen in early-cropping single-cropping rice was more serious.

5. Rice blast: due to the serious occurrence of rice blast in early season, it left more pathogens for single cropping rice. At present, single cropping rice is in the most susceptible tillering stage, and acute leaf spot blast has been found in the field. The main diseased varieties (combinations) were Ⅱ Youhang Ⅰ, Liangyou 2186, Dyou527, Ⅱ You162 and so on. The average rate of diseased leaves was 3mur12%. Jianyang County Plant Protection Station investigated in Masha super rice field on July 6, the incidence of leaf blast was 36 mu, the incidence of clump disease was 28%, the incidence of plant was 11%, the incidence of leaf was 3.7%, and the disease index was 2.3.