Investigation on Matsucoccus sinensis and its natural enemies and their occurrence patterns in the southern region of Gansu Province
[Objective]The objective of this study was to investigate the occurrence time,living habits,morphological changes at different stages,and natural enemies of M.sinensis in southern Gansu,providing a reliable basis for effectively monitoring the population dynamics of M.sinensis.[Method]Three monitoring samples of Pinus tabulaeformis were selected from the Xiaolongshan Forest Region,Kangxian Forest Re-gion,and Bailongjiang Forest Region in southern Gansu,based on the distribution status of M.sinensis.The study employed a combination of continuous field investigations,indoor breeding,observations,and micro-scopic examinations.[Result]The newly hatched nymph of M.sinensis had developed antennae and feet.The first instar nymph undergone black shell formation in the later stage,and the second instar nymph be-came a third instar nymph after overwintering within the shell.The third instar male nymph exited the scale shell and moved into the bark layer at the base of the tree trunk.After pupation,it emerged as a male adult,while the third instar female nymph transformed into a female adult within the scale shell.M.sinensis exhib-ited an annual life cycle in southern Gansu,with the first hatching nymphs appearing in mid-May,late May,and early June in the three forest areas,respectively.All nymphs overwintered as second instars.Eight natu-ral enemies of M.sinensis were identified in the southern forest area of Gansu,including Sympherobius mat-sucocciphagus,Sympherobius weisong,Chrysopa kulingensis,Chilocorus kuwanae,Coccinula quatuordecim-pustulata,Rodolia limbata,Synharmonia bissexnotata,and Polyrhachis vicina.[Conclusion]Through sys-tematic descriptions of morphological changes and developmental processes at various stages of M.sinensis,including the use of continuous photography to capture characteristic morphological features during expo-sure,mating,and egg-laying of newly hatched nymphs and female adults,this study provided a reference ba-sis for rapid and accurate identification,population investigation,prediction,and quarantine of the scale in-sect in the field.
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