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After analysis, the reasons for the occurrence of the local five (3) generation and six (4) generation rice leaffolders are mainly in the following aspects. The first is that climate warming leads to the advancement of rice leaf roller cockroaches in advance, and the number of introgressed insects increases, and the base number of the four (2) generation rice leafroller is large. The second is that the meteorological conditions and the closed field environment are conducive to the occurrence of rice leaf roller. Third, the variety and variety of planting methods have delayed the growing period of rice. When the late rice leaf roller emerges, the rice grows green and the conditions of foodstuffs are good. It is beneficial to the oviposition, hatching and survival of larvae. Fourth, due to factors such as the delay in the control of pharmaceuticals and other factors, the efficacy declines.
In view of the occurrence characteristics of Cnaphalocrocis medinalis, the following key technologies should be grasped during production and control. (1) The appropriate period of prevention and treatment is appropriate. The traditional habit of controlling rice leaf roller, the traditional habit is to master the use of drugs at the peak of the 2nd instar larvae, that is, when the leaves begin to appear in the field. Taking into account the large amount of rice leaffolder production in recent years, and pesticides play a role in the efficacy of drugs takes some time, production should be appropriate to advance the prevention and treatment time, medication in the egg incubation period. Usually four (2) and five (3) generations are used for drug administration 7 days after the moth peak, and six (4) generations are administered 10 days after the moth peak. (2) Use high efficiency and low toxicity agents. From the perspective of popularization and application in large areas in recent years, propofol or chlorpyrifos and avermectin, chlorantraniliprole, indoxacarb, and Daowongsan are effective in controlling rice leaf roller. Single use of triazophos, acephate phosphorus have certain control effect on rice leaf roller, but there is still a certain amount of white leaves, large-scale years should not be popularized. (3) Use medication several times as appropriate. According to the characteristics of five (3) generations and six (4) generations of rice leaffolders, which are characterized by multiple peaks, prolonged periods, and large amounts of insects, five (3) progeny are used for at least two to three treatments and six (4) are controlled. ) The worms were used 1 to 2 times, with an interval of 7 to 10 days. (4) Improve the quality of application. Spray it evenly and make sure that it is not missed. Promote fine spray, try not to coarse spray; prevent rain within the appropriate period, need to grab raindrops assault drug, in the rain after the leaves on the water or dry morning dew spray, so as to avoid the liquid to be rolled or diluted to reduce the effectiveness.
Grasp the key technologies to prevent and control rice leaf roller
Rice leaf roller is an important pest on rice in our province. In recent years, five (3) generations and six (4) generations of rice leaf roller in the area along the Yangtze River in Nantong have continuously occurred, which seriously affects the high yield and quality of rice.