Coverage is King

In the case of fungicide applications, subsequent sprays fill in gaps left by previous sprays. If timing is prompt, residual activity will see you through.

We’ve often heard the adage “Coverage is King” but what does that mean, exactly? It means that in order for your spray application to yield acceptable results, a threshold amount of the active ingredient in your tank must end up on the target. But at what point have we achieved sufficient spray coverage without wastefully […]

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Adventures in Lecturing

Harvest is mostly done and growers want to hear what we’ve learned and what’s coming next. Lecture season is upon us once again. We’re still finding our way through virtual conferences and hybrid models, but I like to think we’re slowly returning to the in-person format. Just last week I gave my first in-person talk […]

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Air-Assisted Spraying in Greenhouse Ornamentals

Greenhouse Insects The aesthetic value of ornamental plants requires a near-zero tolerance for insect pests, which cause up to 10% of crop losses per season. Controlling them with insecticides is a difficult proposition: Key pests such as thrips, aphids and whiteflies tend to feed on the underside of leaves – a notoriously difficult surface to […]

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Centrifugal and Diaphragm Pumps

Adjusting Sprayer Settings Operators are encouraged to adjust airblast sprayer settings to conform to the variability in canopy size, density, spacing, and weather conditions. The efficiency and accuracy of the application is improved through the regular and independent adjustment of travel speed, nozzle output, and air settings. Inflexible sprayer design results in a suboptimal match […]

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Testing and Correcting Airblast Pressure

Two gauges keep each other honest – this GB (Italian-made Good Boy) is sporting a home-made assembly that cost ~$50 to assemble, including the second gauge. The silver spray paint on the black pipe prevents rust and makes it look pretty darn sharp.

The role of pressure is often underappreciated in spraying. Many airblast operators (still) don’t use rate controllers, so the only way to monitor sprayer pressure is using a single liquid-filled pressure gauge located near the pump… and it may not be trustworthy. An inaccurate pressure gauge may cause you to spray more or less product […]

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