Category Archives: IPM

Pest Management: Pesticide Redistribution, an important feature of synthetic pesticides

Brent Warneke

I have been working on the Intelligent Sprayer (ISS) project with the Nackley lab investigating management of plant diseases such as grape powdery mildew while also investigating ways to improve spray coverage and efficacy of the ISS on hazelnuts and nursery crops. I was recently invited to write an article for, a resource used globally to inform and provide resources to producers, to discuss my work exploring pesticide redistribution in plant tissues following application.

Pesticide redistribution is a characteristic of many modern synthetic pesticides that aids in their efficacy and reliability. Pesticide redistribution is the movement of pesticide away from its point of deposition to a different spot on or in the plant where it retains its activity against the pest or pathogen of interest. While many pesticides have redistribution properties, they are often under-studied and not always considered when choosing a pesticide product for an application.

One example of a type of pesticide redistribution is “translaminar redistribution”. This occurs when a pesticide is applied to one side of a plant (for example, a leaf) and absorbs through the plant tissue to protect the other side that did not directly receive spray (Figure 1). This can help make a pesticide application more effective especially when the crop contains dense or complex growth that is difficult to fully cover with pesticide when spraying. There are other types of redistribution that each are effective in their own way such as xylem systemic, phloem systemic, and vapor redistribution.

image shows pesticide movement within plant tissues
Figure 1. Translaminar relocation

Read more about this in the article on While you’re there, explore the many other posts covering everything from sprayer optimization and nozzles to maintenance. Also featured on the page is Airblast101, a comprehensive handbook on the principles of air blast spraying.

Right: Brent Warneke (right) and Brian Hill (left) with the Intelligent Sprayer used for research at the North Willamette Research and Extension Center

Brent Warneke and Brian Hill with the ISS sprayer

Lab Overview 2022

The Nackley lab is committed to being an inclusive group who investigates the maladies of young plants. We are scientists and educators with expertise in ecology, entomology, soils science, and engineering.

Nackley Lab practicing social distancing after setting up our herbal distancing boxwood blight trial

Our mission is to sustain horticultural productions systems by partnering with growers and academics to provide research-based solutions. Our programs take four main themes that address major challenges to nursery and greenhouse production in Oregon: 1. Irrigation application; 2. Pest management; 3. Plant nutrition; and 4. climate adaptation. Our projects are designed to provide information that will support vibrant, verdant, urban and rural communities. We seek the balance between the low resource-use while maximizing plant health/quality. Often we grow plants the wrong way so you don’t have to.

Team members checking nutrient concentrations on our run-off pad at NWREC

This year, we continue research on flathead borers, precision sprayer application, sensor-controlled irrigation, heat, and drought stress mitigation, hemp production, hydroponic production, and nutrient management in soilless substrates. Throughout the year we’ll be posting about these projects and the people who conduct the research. Also, check out our previous Projects and Publications pages to see our pre-blog work. You can also stay up to date on either of our social media feeds. 

Welcome to the Nackley Lab

We’re just getting started with our content, and we’re excited to share our work on nursery and ornamental production. Here are some things you can expect coming your way:

  • Soils and substrates for plant production
  • Irrigation and Nutrient Management
  • Strategies for managing pests
  • Climate-Ready planting
  • Greenhouse Management

We are proud to partner with many of the local growers, students and other extension partners in the Pacific Northwest. Stay tuned to learn about our team and the work we’re currently involved with!