Effects Of Two Wild Host Plants On Mating Strategy,Population Age-Specific Fecundities And Population Growth Of Colorado Potato Beetles

Colorado potato beetles are major agricultural invasive pest and international quarantine object.The wild host plants,such as Hyoscyamus niger and Solanum rostratum,which are eaten by Colorado potato beetles,are mostly distributed in the unmanaged wasteland.When the cultivated host is deficient,the wild host is the transitional host plant of Colorado potato beetles,which further promotes the growth and development of Colorado potato beetles and population diffusion.In order to explore the relationship between Colorado potato beetles and wild host plants,this study took Colorado potato beetles as the research object,used statistical method and amphoteric TwoSex MChart software to analyze and compare the mating frequency,reproductive capacity and life table parameters,and defined the rules of mating,reproduction,growth and development of Colorado potato beetles.The wild host plants provide nutrition for the growth and development of Colorado potato beetles,so as to promote its population reproduction and global diffusion.Therefore,the impact of different wild host plants on Colorado potato beetles was carried out,so as to provide suggestions for the effective control of Colorado potato beetles.The results of this test are as follows:(1)The whole generation of Colorado potato beetles can successfully complete mating if they get nutrition from potatoes,Solanum rostratum and Hyoscyamus niger alone.Different host plants had different effects on the mating peak of Colorado potato beetles.There were significant differences among mating frequency and the mating rhythm in the same time periodof Colorado potato beetles which fed on different host plants(P<0.05).The mating frequency and the mating rhythm in the same time period of H♀×H♂,H♀×P♂,H♂×P♀ were lower S♀×S♂,S♀×P♂,S♂×P♀、P♀×P♂.Therefore,compared with Hyoscyamus niger,Solanum rostratum was more conducive to adult mating.(2)The reproduction of Colorado potato beetles fed on potato,Hyoscyamus niger and Solanum rostratum could be completed fed on them alone,and different host plants had no significant effect on the duration of preoviposition,duration of ovipositionand egg duration of Colorado potato beetles(P>0.05),but it had a significant effect on egg production and rate of hatching(P<0.05).The egg duration of the females fed on Solanum rostratum and potato were higher than those fed on Hyoscyamus niger(P>0.05).Compared with the treatment of P♀×P♂、S♀×S♂、P♀×S♂,the egg production of H♂×P♀ were also lower,which showed that the previous generation of male fed on different host plants also affected the egg production of female.(3)The Colorado potato beetle could complet reproduction fed on potatoes,Hyoscyamus niger and Solanum rostratum,alone.There were significant differences in the survival rate of 1st instar larvae among different host plants(P<0.05).The 1st instar larvae of the females fed on Hyoscyamus niger was significantly lower than that of the 1st instar larvae fed on other host plants(P<0.05);the survival rate of the 1st instar larvae of the females fed on Hyoscyamus niger was significantly lower than the 1st instar larvae of the females fed on other host plants There were significant differences(P<0.05)in the net reproductive rate(R0),innate capacity of increase(rm)and finite rate of increase(λ)of the next generation of Colorado potato beetles population in the same host plant,and there was no significant difference(P>0.05)in the mean generation time(T);the net reproductive rate(R0),innate capacity of increase(rm)and finite rate of increase(λ)of the next generation of Colorado potato beetles population fed on Hyoscyamus niger were significantly lower than that of the next generation fed on potato and Solanum rostratum.It can be concluded that Hyoscyamus niger,as the wild transitional host plant of Colorado potato beetles,had less effect on the population reproduction strategy of Colorado potato beetles than that of potato and Solanum rostratum.The adult of Colorado potato beetles have certain flight ability,and they may migrate to other wild host plants to continue to breed when the cultivation host is deficient.In order to prevent the further spread of Colorado potato beetles,we should shovel the wild host plants of Colorado potato beetles,such as Hyoscyamus niger and Solanum rostratum,or establish "Colorado potato beetles blockade zone" in the front of the distribution of Colorado potato beetles.