Predation Of Cheyletus Malaccensis(Acari:Cheyletidae)on Megoura Japonica(Hemiptera:Aphididae)and Panonchus Citri(Acari:Tetranychidae)

Cheyletus malaccensis is widely found in the environment of stored grain,Chinese medicinal materials,plant leaves,bark,ground litter and animal nests.It is also a very common predatory mites in storage and can prey on acaridae,scale insects and some small arthropods,therefore have important economic value in the biological control of pests.At present,there are many reports on various pests(mites)such as Tribolium castaneum and Aleuroglyphus ovatus in the predatory storage of C.malaccensis,and no important pests(mites)on other agricultural productions have been observed.Research on the predation efficacy.This paper takes C.malaccensis as the research object,and explores its predation efficiency against agricultural pest Megoura japonica and important agricultural mites Panonchus citri at different temperatures and different prey density.The effect of interspecific density of C.malaccensis on predation performance under density and different predator densities.The main results obtained are as follows:?.Study on the Predation Efficiency of C.malaccensis on M.japonicaThe predatory functional responses of different stages C.malaccensis to M.japonica are consistent with the Holling ? equation.Under the experimental conditions of 16?,20?,24?,28?,and 32?,the predation of M.japonica increased with the increase of temperature.The maximum daily predation of nymph C.malaccensis peaked at 20? is 20.492 heads/day;the female mites peaked at 24? is 51.02 heads/day;while the male mites peaked at 32?,is 56.18 heads/day.In the study of predation efficiency,the predator's attack efficiency per unit time(a/T_h)is usually used to judge its ability.The results of this study indicate that male adults C.malaccensis has the highest predation ability to M.japonica,is 32.36;followed by female adult mites,is 28.878;then nymphs,is 4.918;and larvae have the lowest predation,only 0.119.When the density of peas was fixed,the average predation of C.malaccensis increased with the increase of the density of themself.C.malaccensis are selective for the feeding of larvae and adult M.japonica.The larvae of M.japonica are the favorite worms of C.malaccensis.?.Study on the Predation Efficiency of C.malaccensis on P.citriThe predation functional response of C.malaccensis to P.citri is also consistent with the Holling ? equation.Under the experimental conditions of 16?,20?,24?,28? and 32?,the predation of C.malaccensis to P.citri was a certain change with temperature.When the temperature was between 16 to 24?,the maximum daily predation of C.malaccensis increased with 37.047 heads/day at 24?,but 21.739heads/day at 28?.The maximum was reached at 32?,which was 46.948 heads/day.In addition,the study found that the predation ability(a/Th)of the female C.malaccensis was 28.680 at 24?,19.457 at 28?,and 37.981 at 32?.The experimental study of interspecific interference found that the average predation of female C.malaccensis was gradually reduced with the increase of its own density.In summary,the results of the study on the predation efficiency and interspecies interference of M.japonica and P.citri showed that C.malaccensis showed strong predation ability,which was the agricultural production of peas.The prevention and control of M.japonica and P.citri provides new ideas;it also provides a reference for the field release of C.malaccensis.