Ong Song-Quan, Ahmad Hamdan, Jaal Zairi, Rus Adanan, Fadzlah Fadhlina Hazwani Mohd
Vector Control Research Unit, School of Biological Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia (
KDU Penang University College, 32, Jalan Anson, 10400 Georgetown, Penang, Malaysia.
J Med Entomol. 2017 Jan;54(1):24-29. doi: 10.1093/jme/tjw140. Epub 2016 Aug 22.
Determining the control threshold for a pest is common prior to initiating a pest control program; however, previous studies related to the house fly control threshold for a poultry farm are insufficient for determining such a threshold. This study aimed to predict the population changes of house fly population by comparing the intrinsic rate of increase (r) for different house fly densities in a simulated system. This study first defined the knee points of a known population growth curve as a control threshold by comparing the r of five densities of house flies in a simulated condition. Later, to understand the interactions between the larval and adult populations, the correlation between larval and adult capacity rate (r) was studied. The r values of 300- and 500-fly densities were significantly higher compared with the r values at densities of 50 and 100 flies. This result indicated their representative indices as candidates for a control threshold. The r of larval and adult populations were negatively correlated with densities of fewer than 300 flies; this implicated adult populations with fewer than 300 flies as declining while the larval population was growing; therefore, control approaches should focus on the immature stages. The results in the present study suggest a control threshold for house fly populations. Future works should focus on calibrating the threshold indices in field conditions.
在启动害虫控制计划之前确定害虫的控制阈值是常见做法；然而，先前关于家禽场家蝇控制阈值的研究不足以确定这样一个阈值。本研究旨在通过比较模拟系统中不同家蝇密度的内禀增长率（r）来预测家蝇种群数量的变化。本研究首先通过比较模拟条件下五种家蝇密度的r值，将已知种群增长曲线的拐点定义为控制阈值。后来，为了解幼虫和成虫种群之间的相互作用，研究了幼虫和成虫容量率（r）之间的相关性。与50只和100只家蝇密度下的r值相比，300只和500只家蝇密度下的r值显著更高。这一结果表明它们作为控制阈值候选指标的代表性。当家蝇数量少于300只时，幼虫和成虫种群的r与密度呈负相关；这意味着家蝇数量少于300只时成虫种群数量在减少而幼虫种群数量在增加；因此，控制方法应侧重于未成熟阶段。本研究结果提出了家蝇种群的控制阈值。未来的工作应侧重于在田间条件下校准阈值指标。
