Spatiotemporal dynamics and survey sampling techniques of Aphis spiraecola population in apple orchards of southern Xinjiang
Aphis spiraecola is a major pest in apple orchards of southern Xinjiang.This paper analyzed the population dynamics,spatial distribution pattern,sampling number and sequential sampling of A.spiraecola in apple orchards in the Aksu area.The results showed that population dynamics of A.spiraecola in the apple orchard presented an obvious single peak during May to August,and June encountered the population peak period.During the period with the highest population,the spatial pattern of A.spiraecola in apple orchards was clustered,and population density displayed no significant difference in different directions of the apple tree.The optimal theoretical sampling model was N=t2/D2(163.90/m+0.16).Given the economic threshold of 1 500 individuals/12 branches,the sequential sampling model formula was Tn=1 500n±1 534 √n.Our results provided an important scientific basis for the investigation and monitoring of A.spiraecola population in apple orchards of southern Xinjiang.
apple orchardAphis spiraecolapopulation dynamicspatial distributionsampling technique
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万方数据
