Feeding and oviposition preferences of Diaphania caesalis Walker on different plants
To clarify the feeding and oviposition preferences of Diaphania caesalis on different plants,including three jackfruit varieties('Malaysia no.1''Haida no.1''Four-season jackfruit'),Artocarpus integer,Artocarpus altilis,Ficus auriculata,and two mulberry varieties('Taiwanchangguosang'and'Yueshenda10'),the leaf disc method,leaf area method,and laboratory observation were used to compare and analyze feeding and oviposition selectivity,feeding area,and the survival rate of newly hatched larvae feeding on different plants.The results showed that the feeding preference of the 1st-and 2nd-instar larvae of D.caesalis on jackfruit was not obvious,with no significant differences in feeding selection rates among different plants,but the 3rd-to 5th-instar larvae preferred to feed on jackfruit.There were no significant differences in daily average number of eggs laid by female D.caesalis on different plants,though females tended to prefer laying eggs on jackfruit and A.altilis,particularly on'Malaysia no.1',accounting for 22.13％of the total number of eggs laid on all plants.With the increase of instar,the feeding amount of D.caesalis on different plants gradually increased,with the 5th-instar larvae showing the highest food intake.While there were no significant differences in the feeding amounts among three jackfruit varieties('Malaysia no.1''Haida no.1''Four-season jackfruit'),A.integer,A.altilis and F.auriculata,the feeding amounts were significantly higher than those on the other two mulberry varieties.There were significant differences in the survival rates of newly hatched larvae after feeding on different plants for 48 hours,with individuals feeding on 'Malaysia no.1'showing the highest survival rate(98.51％),while those feeding on 'Taiwanchangguosang' had the lowest survival rate(0.37％).Overall,D.caesalis have a much higher feeding and oviposition preference for plants in Artocarpus genus,have a risk of transfer to F.auriculata,and a low risk to mulberry.These results provide a reference for risk monitoring and prevention/control against D.caesalis on different plants.
万方数据
维普
