Chapter 25

Pesticide Application and Equipment in Greenhouses

(draft book excerpts)

When developing an integrated pest management strategy, it is important to know the target pests, their economic threshold levels, and multiple control strategies that can minimize pesticide inputs in the greenhouse. However, in many cases, pesticides need to be applied as a last resort to reduce pest infestations and optimize crop production. The objective in applying pesticides in greenhouses is to deliver an effective, uniform dose to a target area in a safe and timely manner. To accomplish this, the characteristics of the pest must be known as well as the characteristics of the pesticide. Prior identification of the pest, location of the pest, and the most susceptible stage of the pest to the pesticide is critical for proper control. Inaccurate pesticide application is expensive and can result in wasted pesticide, marginal pest control, increased likelihood of pest resistance, compromised worker safety, and possibly excessive pesticide carryover contributing to water contamination and plant damage. Many types of application equipment are available to apply pesticides. Some types can be used in a wide range of situations whereas others are highly specialized and are only used for a few specific pesticides.

Click on the following topics for more information on greenhouse pesticide application and equipment.

Topics Within This Chapter:

  • Sprayer Components
  • Tanks
  • Agitation System
  • Direct Injection Sprayers
  • Pumps
  • Piston Pumps
  • Diaphragm Pumps
  • Centrifugal Pumps
  • Roller Pumps
  • Filtration Devices
  • Fans
  • Other Components
  • Nozzles
  • Pressure Regulators
  • Pressure Guages
  • Control Valves
  • Electronic Systems
  • Hoses, Clamps, and Fittings
  • Sprayer Nozzles
  • Nozzle Materials
  • Nozzle Types
  • Hydraulic Nozzles
  • Cone Nozzles
  • Flat-Fan Nozzles
  • Turbulence Chamber Nozzles
  • Air-Induction Nozzles
  • Air-Shear (Air-assisted) Nozzles
  • Controlled Droplet Applicators
  • Droplet Size Classification
  • Pressure Effects and Nozzle Spray Angle
  • Methods of Pesticide Application
  • Hydraulic Sprayers
  • Types of Hydraulic Sprayers
  • Targeted Low-Volume Sprayers
  • Types of Targeted Low-Volume Sprayers
  • Fog or Ultra-Low Volume Sprayers
  • Types of Fog or Ultra Low-Volume Sprayers
  • Sprayer Calibration
  • Techniques in Sprayer Calibration
  • References