| Ostrinia furnacalis is the most important pest in China's corn production,and it is also the first pest causing corn production reduction in China.In recent years,the trend of temperature increase in Xinjiang is obvious.Increasing temperature not only improves the wintering environment of Ostrinia furnacalis,but also shortens its individual development period.In addition,the significant increase in precipitation in spring is also conducive to the recovery and development of overwintering Asian Ostrinia furnacalis larvae and increase their survival and feathering base after wintering.All these have aggravated the pressure of late prevention and control.At present,Xinjiang has not yet seen the research on the indoor biology characteristics and generations of Asian Ostrinia furnacalis,and in this context,the saturated salt solution method is used to clarify the relative temperature and humidity of wintering larvae of the geographic population of the main Asian Ostrinia furnacalis in Xinjiang.The effect of earthworm emergence;the developmental starting temperature and effective accumulated temperature of the main geographic populations of three Asian Ostrinia furnacalis in Xinjiang were determined using the straight-line optimization method;in combination with the local meteorological accumulative temperature conditions,the actual Asian Ostrinia furnacalis generations in the maize production areas of Xinjiang were verified.Accurate forecasts and comprehensive prevention and control of Asian Ostrinia furnacalis in the district provide guidance.The main findings are as follows:1.The effects of relative temperature and humidity on the overwintering larvae and eclosion of wintering geography populations of the main Asian Ostrinia furnacalis in XinjiangThe saturated salt solution method was used to understand the effects of environmental temperature and humidity conditions on the overwintering larvae,pupa and feathering of geographical populations of the main Asian Ostrinia furnacalis in Xinjiang.The results show that the overwintering larvae have relatively high temperature and humidity,and their rate of emergence and emergence rate are relatively low.Closely related,specifically,there was a negative correlation between mortality and moisture in Asiatic Ostrinia furnacalis after resuscitation,and there was a positive correlation between detoxification rate andhumidity,ie non-parasitic mortality decreased with increasing humidity,and the rate of pupation increased significantly(p<0.05).When the relative humidity was 0%,the mortality rate of KSSL and YLYN population reached 100%,and they could not be eliminated;while under the 100% high humidity,KSSL,KSSL,Ili,Yining The YLYN population had the lowest mortality rates of 32% and 20%,respectively,while the pupation rate peaked at 68.00% and 80%,respectively;and the Asian winter Ostrinia furnacalis larvae increased with temperature during their pupation.The pupation rate and emergence rate gradually increased;28 ? was the optimum temperature,and then showed a downward trend;and at the same temperature,the pupation rate and emergence rate of the KSSL population was significantly higher than that of the Ili population(p<0.05).2.Find out the biological populations of geographic populations of the main Asian Ostrinia furnacalis in Xinjiang and their biological characteristics such as effective accumulated temperature.The straight line optimal method was used to determine the developmental starting temperature and effective accumulated temperature of geographic populations of three Asian Ostrinia furnacalis populations in Xinjiang.The results showed that the temperature range of 20? to 31?,the temperature of all the Ostrinia furnacalis species increased,and the development period was significant.Shortened,accelerated growth rate.The results of the direct optimal method show that the developmental starting point and effective accumulated temperature of eggs,larvae,pupa,pre-oviposition period and all generations of the WLMQ population are 14.35 ?,54.52 days · degrees,9.93 ?,353.25 degrees · degree,12.58 respectively.°C,81.95 degrees · degrees,16.27°C,37.52 degrees · degrees and 11.92?,504.52 days · degrees;Yiling Yining(YLYN)populations of eggs,larvae,pupa,pre-oviposition period and the developmental starting point of the whole generation,effective accumulated temperature They are 14.36°C,52.57 day-degree,9.01?,346.15-day-degree,12.06?,107.16-day-degree,16.61°-degree-degree,36.72-day-degree and 11.32?,533.41 days-degrees,respectively;KSSL population(KSSL)population The developmental starting points and effective accumulative temperatures of the larvae,pupa,pre-oviposition period and all generations were 14.42 ?,50.32 days · degrees,8.99 ?,344.97degrees·degrees,11.91?,105.88 degrees·degrees,16.38?,and 37.95 degrees·degrees,respectively.,11.92?,506.20 days · degrees.In addition,the larval development threshold was the lowest in all stagesof the larvae,which was significantly lower than that of the egg,pupa,and pre-oviposition periods(p<0.05).In terms of effective temperature,the larval stage was the largest,followed by the pupa stage and the egg stage,followed by spawning.The lowest early period.3.Validation of generations of Asian Ostrinia furnacalis theory in major maize producing areas in XinjiangBased on the identification of the geographical origins of the populations of the major Asian Ostrinia furnacaliss in Xinjiang and the indoor biological characteristics such as effective accumulated temperature,combined with the local meteorological accumulative temperature conditions,it is possible to measure the occurrence of KSSL population in Asian Ostrinia furnacalis from 2015 to 2017.The theoretical algebras(including overwintering generation)were 3.94 generations,4.01 generations,and 3.72 generations respectively.The theoretical generations(including overwintering generation)of Asian Ostrinia furnacalis populations in the YLYN population in 2015 and 2016 were 2.99 and 3.13 respectively.Combined with the monitoring of the actual growth and decline of the Asian Ostrinia furnacalis field for two consecutive years from 2015-2016 in Kashgar Shule and Yili in Yining,the results verified the theoretical generation generation number.This shows that the weather conditions of KSSL and YLYN have basically reached the accumulated temperature required for 3 generations a year,and the occurrence of the 2nd generation of Asian Ostrinia furnacalis in the two main maize production areas has gradually changed.For the 3generation trend. |
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