Study On The Occurrence Regularity And Control Strategy Of The Rice Pest In Jixi

The rice pests mainly composed of Cnaphalocrocis medinalis,rice planthopper and Chilo suppressalis,which several threat to high efficiency,quality and safety of rice yield.To know its characteristics and regularity of rice pests occurrence can effectively reduce damage coused by rice pests,so as to provide high-yield rice,high quality,environmental protection.Based on the investigation of the main pest occurrence in the rice field of Jixi from 2000 to 2016,this paper analyzes the periodical occurrence and puts forward the comprehensive prevention and treatment suggestions.The result are below.1.Tendency of occurrence of middle-season rice insect pests in Jixi.The main characteristic of rice planthopper is that the time of migration is earlier,and the frequency of migration is high,and the damage to rice is severe.According to the statistics,from May to September in 2016,the occurrence of rice pest in Jixi was planthopper(Laodelphax striatellus,Sogatella furcifera,Nilaparuata lugens),and there was an early trend in the fluctuation.The time of gray planthopper's appearance is the earilist and afflicting in the tillering stage.Whiteback planthopper afflicts rice in the tillering and botting stage,and brown planthopper afflicts rice in botting and gain filling stage.The number of occurrence of rice planthopper in the tillering stage is mainly higher than the number in the gain filling stage from 2000 to 2013.But it is opposit from 2014 to 2016.Cnaphalocrocis medinalis is also a kind of rice pest,which is affected by factors such as airflow and weather.It has the characteristics of frequentative immigration and the difficulty of prevention.At the same time,Cnaphalocrocis medinalis immigrate early and occur heavily,and it immigrate later and occur lighter.The occurrence of Cnaphalocrocis medinalis was mainly concentrated before 2011,and the number of effective insects decreased after 53years,especially in the four years from 2013 to 2016.The incidence of Chilo suppressalis did not fluctuate significantly,with 88%of the year between May 1 to 11,but the trend ahead of 2010 was more pronounced,especially to the earliest in 2016 in previous years;and in recent years,the average number of larvae in the 667m~2 in 2010 was 714,and it's to3.1 times in 2011 than 2010;in 2013~2016,the average daily amount of larvae in the667m~2,than the steady trend between 7 years from 2000 to 2006.And the difference was significant.However,the change of larvae was not significant in the past four years,and the average number of larvae was fluctuated in the range of[1590,1770].The difference of occurrence of Chilo suppressalis was not significant at tillering stage and booting stage from 2000 to 2010,and the tillering stage was lower than that of booting stage.In 2011~2016,the occurrence rate of Chilo suppressalis significantly increased,and the tillering period was higher than that of borer Booting stage.2.The main causes of middle-season rice insect pests occurrence in Jixi are as bellows,the area of mountains belongs to southern Anhui,warm and humid,5-6 months of rice transplanting,the occurrence of Chilo suppressalis artibuted to the appropriate environment;humidity,rainy season duration,especially from June to August to heavy rain,strong convective weather more frequent,which are conducive to rice planthoppers,rice leaf roller borer large movement.The rice is mainly composed of two varieties of Y 2series,the species is relatively simple,the growth of rice is dense,the pest is rich in food and the rice and wheat rotation is carried out,and the planting area is gradually enlarged and so on.3.Control suggestions of middle-season rice insect pests in Jixi.The main rice pests in Jixi County were in the tillering stage,booting stage and grain filling stage.The control period of rice planthopper was the age of 2 and 3 larvae.As Chilo suppressalis is generally in the local winter larvae,the annual occurrence of the earlier period,mainly 1~3generations of rice damage,and Jixi rice 5~6 months transplanting,generation of Chilo suppressalis moth peak in May 12~17 Day,egg hatching peak in the May 21~25,so the prevention and treatment of Chilo suppressalis is best in the seedling transplanting 3~4days before medication,to ensure that transplant with medicine,early planting plots in the May 22~27 About medication,late planting plots in the June 3-8 or so medication.In addition,it can also promote the use of Lepidoptera borers moth pests dedicated dry traps,the use of Internet of things to trap the trap information directly to the management platform mobile phone,is a comprehensive,scientific insect pheromone control,toxicity,residue,environmental and ecological security evaluation system,Jixi has begun to test use.