Rice diseases and pests will occur later
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Rhizoctonia solani has become a frequent and recurrent disease on rice in our province. There are two main causes of the disease in the first two years. The first is that the high temperature and humidity weather is conducive to the spread of the disease, and the second is that in some areas and The large population of the plots of the plots and the environment in which the plots are covered are aggravated. According to the forecast of the provincial meteorological observatory, most of the province’s average temperature in July has been slightly higher than usual, and local high, which is conducive to the spread of sheath blight, together with the early and rapid growth of rice transplants in most regions this year. The emergence of peak seedlings in the field is early, and the probability of early occurrence and re-emergence of sheath blight is high. It is expected that the occurrence will be more severe than in 2011.
Rice blast disease and rice blast disease have high prevalence rates in the hilly, Jianghuai, and Huaibei regions of our province in recent years. Rice blast disease has a high prevalence in hybrid rice areas and areas where there are many varieties with large crude culm and large spikes. The reason is that the variety is susceptible and the weather conditions are suitable. This year's rice varieties have not been greatly adjusted compared to last year, and the cultivated area of ​​susceptible varieties is still large, such as Huajing No.6, Huajing No.7, Nanxun No. 44, Zhendao 99, and Yandao No.8 planted in some regions. Xudao series and II You series of hybrid rice and other varieties are susceptible to rice blast, the hybrid rice varieties in the area along the Yangtze River in southern Jiangsu, and the area of ​​hybrid rice along the Huaihe River area are conducive to the occurrence of rice smut disease. Rice blast and rice smut are expected to occur more frequently in areas with high prevalence.
The degree of occurrence of rice leaffolders was related to the amount of migration, and the amount of infestation was mainly related to two factors, namely, the amount of insects in southern insects and the weather conditions during the migration period. This year, the southern rice area still has a relatively high base of occurrence, which provides sufficient resources for our province to move in. Most of the early rice in southern China and southern China are about to mature, and our province is in the Meiyu period, that is, rice leaf roller. The period of emigration is consistent with the weather conditions suitable for emigration to our province, which is conducive to further migration. In recent days, there have been peaks of migration in some parts of Taihu Lake, and the amount of insects in Jintan and other places was higher than the same period of last year. The middle and late July is the period of major migration of rice leaf roller, and it is expected that there will be a large number of relocations. It is more likely to occur in the middle of last year than in middle-weighted countries.
The extent of rice planthoppers is mainly related to the amount of relocation and the weather conditions after the relocation. At present, the amount of rice planthoppers in the southern rice region is three times that of the normal year. Some areas have already appeared “eruption†and have recently moved into our province. Until late July, the main period for the migration of rice planthoppers is. At the present stage, the area south of the Huaihe River is still in the period of Meiyu. According to the forecast of the provincial meteorological observatory, the precipitation in July is slightly more north than in the northern area of ​​Huaibei and Jianghuai, which is conducive to the migration of rice planthoppers and is more likely to occur. In addition, judging from the climate characteristics in recent years, the possibility of a warm autumn climate this year is more likely to increase the occurrence of rice planthoppers.
In recent years, aphids have shown a tendency to increase, and a generation of S. japonicum has developed in hilly areas and in parts of Huaibei. The number of residual insects is high, with more than 1,000 acres of debris. The second generation of second-generation aphids has a large base number and will reach the degree of occurrence. The second generation of giant salamanders has entered the egg hatching period. The amount of moth trapped in the southern part of Jiangsu Province and most of the rivers has been the first to the third in the past ten years, and will reach a moderate degree, with partial occurrence.
In addition, rice varieties in coastal areas and Huaibei regions are more susceptible to bacterial blight, and the threat of the disease is also greater.
It is necessary to formulate prevention and control plans as soon as possible in production and take the initiative to fight the overall battle against pests and diseases. From the tillering stage to the booting stage of rice, we should focus on sheath blight and “two migration†pests to reduce the occurrence base; before and after the break period, rice blast, rice smut, sheath blight, “two migration†pests, and locust should be used. Focusing on the control of pests and diseases, during the filling period, based on the occurrence of pests and diseases in the field, the overall pest control campaign based on sheath blight and “two migrations†pests was established to control hazards.