ABSTRACT
Integrated pest management (IPM) is an environmentally and economically sustainable method of managing pests based on applying pesticides only when pest populations surpass a point where expected resource loss exceeds control costs. Site-speciŽc pest management extends IPM principles by determining the spatial and temporal distribution of pest species and optimizes agricultural inputs by spatially adjusting location and/or application rate based on varying conditions within a Želd. The green peach aphid, Myzus persicae (Sulzer), is a candidate for site-speciŽc
8.1 Executive Summary ...................................................................................... 167 8.2 Introduction .................................................................................................. 168 8.3 Methods ........................................................................................................ 174
8.3.1 Exercise 1: Describe the Spatiotemporal Colonization Patterns of M. persicae in Seed Potato ........................................................... 174 8.3.1.1 Description of Dataset ....................................................... 175 8.3.1.2 Assessing Spatial Autocorrelation Using
Semivariograms in GS+ ..................................................... 176 8.3.1.3 Plot the Data from the Dataset in ArcMap ........................ 179 8.3.1.4 Discussion of Observed Colonization Patterns .................. 182
8.3.2 Exercise 2: Using the HYSPLIT Model to Determine If the Wind Vectors at SpeciŽc Dates Provided a SigniŽcant Risk of Aphid Immigration into the Red River Valley ............................. 183 8.3.2.1 Using HYSPLIT to Examine LLJ to Facilitate
Movement of Aphids into the Red River Valley ................ 183 8.3.2.2 Discussion of HYSPLIT Results ........................................ 186
8.4 Conclusions ................................................................................................... 186 References .............................................................................................................. 186
management due to colonization patterns that begin at Želd edges and progress inward. While aphid populations may not cause extensive damage, viruses that the aphids vector may reduce yield, cause the loss of virus-free certiŽcation in seed potato (Solanum tuberosum) production, and result in signiŽcant monetary loss for producers. This case study shows how to summarize the spatial and temporal distribution of M. persicae colonizing seed potato Želds based on 3 years of data. In addition, the Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) model will be demonstrated to predict the seasonal abundance of M. persicae based on wind-mediated dispersion as low-level jet (LLJ) events can identify when scouting efforts of seed potato Želd margins should begin.
