Community diversity and occurrence dynamics of major pests in Melaleuca leucadendron and its mixed forests
[Objective]The present paper aimed to clarify the diversity,distribution,and occurrence dynamics of the main pest communities in pure plantations of Melaleuca leucadendron and its mixed plantations with Eucalyptus plantations and Podocarpus macrophyllus in Guangxi,providing a basis for the cultivation of M.leucadendron and green non-pollution pest control.[Method]In 2023,the planting areas of M.leucadendron in Qinzhou,Guangxi were investigated,mainly through route surveys and standard plot surveys,supplemented by fixed-point monitoring,regular surveys and indoor rearing observations.The study focused on the composition,diversity and occurrence dynamics of the main pest communities in M.leucadendron and its mixed plantations.[Result]There were 28 species of main pests belonging to 22 families in M.leucadendron plantations,including Hemiptera,Lepidoptera,Coleoptera,Orthoptera,Dermaptera and Thysanoptera,with the highest numbers of pests in the Lepidoptera and Hemiptera.Higher numbers were found in M.leucadendron × Eucalyptus mixed plantations,with significant damage to leaves by Euricania ocellus,Bombotelia sp.,Strepsicrates coriariae,Jankowskia fuscaria and Hyalopterus arundimis.A-mong the three types of stands,B.jocosatrix caused the most severe damage in the mixed plantations,the highest number of pest species was found in the mixed forests of M.leucadendron × P.macrophyllus and the pest diversity was the lowest in the pure stands.The pest occur-rence dynamics were more stable and the damage was less severe in the M.leucadendron × P.macrophyllus mixed plantations.There were differences in the abundance of pests and Chao1 index among different stand types,with the M.leucadendron × Eucalyptus mixed planta-tions having a higher pest abundance and Chao1 index.The occurrence dynamics of B.jocosatrix and M.phaseoli varied among different stands,with the earliest outbreaks of B.jocosatrix in the M.leucadendron × Eucalyptus mixed plantations and M.phaseoli in the pure M.leucadendron stands.[Conclusion]Mixed plantations of M.leucadendron with different species can help improve pest occurrence and diversi-ty,with the M.leucadendron × P.macrophyllus mixed plantations reducing the occurrence of major pests among the three stand types.
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