Panthi Babu R, Renkema Justin M, Lahiri Sriyanka, Liburd Oscar E
Gulf Coast Research and Education Center, University of Florida, Wimauma, FL 33598, USA.
Crop and Soil Science Department, Oregon State University, Corvallis, OR 97331, USA.
Insects. 2021 Mar 18;12(3):256. doi: 10.3390/insects12030256.
Hood is an invasive and foliar pest of Florida blueberry that reduces plant growth by feeding on new leaf growth. A sampling plan is needed to make informed control decisions for in blueberry. Fourteen blueberry fields in central Florida were surveyed in 2017 and 2018 after summer pruning to determine the spatial and temporal distribution of and to develop a fixed-precision sampling plan. A sampling unit of ten blueberry shoots (with four to five leaves each) was collected from one blueberry bush at each point along a 40 × 40 m grid. Field counts of varied largely ranging from zero to 1122 adults and larvae per sampling unit. had aggregated distribution that was consistent within fields and temporally stable between summers, according to Taylor's power law (TPL) (aggregation parameter, = 1.57), probability distributions (56 out of 70 sampling occasions fit the negative binomial distribution), Lloyd's index ( > 1 in 94% occasions), and Spatial Analysis by Distance IndicEs (31% had significant clusters). The newly developed fixed-precision sampling plan required 167, 42, seven, or three sampling units to estimate a nominal mean density of 20 per sampling unit with a precision of 5%, 10%, 25%, or 40%, respectively. New knowledge on distribution will aid in evaluating the timing and effectiveness of control measures.
胡德氏叶甲是佛罗里达蓝莓的一种入侵性叶部害虫，它通过取食新叶生长来抑制植株生长。需要一个抽样计划，以便为蓝莓虫害防治做出明智决策。2017年和2018年夏季修剪后，对佛罗里达州中部的14个蓝莓种植园进行了调查，以确定胡德氏叶甲的空间和时间分布，并制定一个固定精度的抽样计划。沿着40×40米的网格，在每个点从一棵蓝莓灌木上采集10个蓝莓嫩枝（每个嫩枝有4至5片叶子）作为一个抽样单元。每个抽样单元的田间胡德氏叶甲成虫和幼虫数量差异很大，从0到1122不等。根据泰勒幂法则（TPL）（聚集参数，b = 1.57）、概率分布（70次抽样中有56次符合负二项分布）、劳埃德指数（94%的情况下I > 1）以及距离指标空间分析（31%有显著聚类），胡德氏叶甲具有聚集分布，且在种植园内一致，夏季之间在时间上稳定。新制定的固定精度抽样计划分别需要167、42、7或3个抽样单元，以估计每个抽样单元名义平均密度为20只的虫口密度，精度分别为5%、10%、25%或40%。关于胡德氏叶甲分布的新知识将有助于评估防治措施的时机和效果。
