| Asian corn borer,Ostrinia furnacalis(Guenée),is an important agricultural pest with a wide range of damage.On average,it will bring 8%-10% of production loss to China’s corn production every year.Determining the dynamics of O.furnacalis in the field is an important part of field control technology.In order to determine the impact of host plants on populations dynamics,correlation between occurrence dynamics and protective enzyme activity,factors affecting of Protective enzyme activity.This experiment used the traps to investigate the occurrence dynamics and quantity of O.furnacalis in different host fields.The preference of different host plants for male moths and its effects on larval growth and development;the relationship between host field,occurrence period,population dynamics and host plant and protective enzyme activity was analyzed;the effects of mating,temperature and nutrient conditions on the enzyme activity of male moth were determined.The results showed: There are differences populations of male moth in different habitats,the average trapping amount of O.furnacalis in weed field and vegetable fields was 15,14 head/trap/day,in soybean field and maize field,the average lure of the male moth was 12,11 head/trap/day.The population dynamics of male moths in different habitats are different,mainly reflected in the peak time.The first peak of rice field appeared earlier on June 12,vegetable field,weed field,maize field appeared in June 15-20,sorghum field,soybean field peak appeared later on June 25,the second peak appeared in maize fields,rice fields,vegetable fields,sorghum fields,soybean fields around August 12,weed field appear at the latest around August 28.O.furnacalis from corn fields,rice fields,and sorghum fields mainly inhabit the Artemisia argyi,which were 4.6,7.8,6.0 heads/plant;O.furnacalis,which was collected from the weeds,mainly inhabited 6.8 heads/plant.O.furnacalis can complete life history on 12 plants.The larvae of O.furnacalis fed with Xanthium sibiricum had shorter larval development period and pupal stage,larger pupa weight and higher pupal formation rate,they were 17.4d,5.9d,50.7mg,and 79.6%,respectively.The larvae of O.furnacalis feed with Brassica campestris has a long life,higher larval survival rate,and more total eggs per female,there are 8.5d,81%,and 210.1/grain,respectively.There are related between occurrence period,habitat,occurrence,host plant and protective enzyme activity of O.furnacalis.The activity of SOD was higher in the male larvae after feeding Polygonum lapathifolium(474.5 U/mg),and the activity of POD(250.3 U/mg)and CAT(2196.5 U/mg)was higher in the male larvae after feeding Xanthium sibiricum.The activity of 3 kinds of protective enzymes of male moth after mating was higher than that of the mating male moth(After mating: SOD: 463.2 U/mg,POD: 227.1 U/mg,CAT:1786.3 U/mg;Before mating : SOD: 435.7 U/mg,POD: 209.6 U/mg,CAT:1730.3 U/mg;).The activity of the corn borer in the field was higher at low temperature(15℃)and at high temperature(30℃),and the enzyme activity of the artificially reared corn borer increased with temperature(15℃-30℃);The activity of 3 kinds of protective enzymes of male moth with honey water is higher than that of drinking water male moth(Honey water: SOD: 425.5 U/mg,POD: 225.1 U/mg,CAT: 2000.6 U/mg;Water: SOD: 394.5 U/mg,POD: 222.6 U/mg,CAT:1630.4 U/mg).The main conclusions of this study are as follows: the occurrence and peak period of O.furnacalisr in different habitats in different habitats indicate that different habitats can affect the dynamics of O.furnacalis population;the population dynamics of O.furnacalis are related to protective enzyme activity,affecting protection The factors of enzyme activity can also affect the population dynamics of O.furnacalis.The external factors in different habitats can affect the activity of protective enzymes.Cross-tailing activities,proper temperature increase and certain saccharide substances can increase the activity of three protective enzymes of O.furnacalis. |
