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Factors affecting successful lawn treatments

Lawn Daisies As a lawn owner, application timing of treatment products is critical to acheive the best results from your efforts. 

All too often, you can spot applications being made too early in the year or too late in the year or when the lawn is under stress. 

If the lawn treatment products are applied in the non-growing season or under times of stress, the desired results will not be acheived and the lawn owner will quickly lose faith in their chosen product when after all, it may not be the products fault in the first place, just that the timing was wrong in the first place.

The environmental factors that influence the degree of control achieved with a given lawn herbicide are:






The effect of wind is two-fold in reducing control, due to a lack of contact with the target weeds and also due to the herbicide being carried to sensitive, non-target plants.  Obviously, the greater the amount of drift, the lower the degree of control. 

Herbicide vapours can also move in the atmosphere, especially by wind movement.  This has been a common problem with some active ingredients on warm days, especially oil based lawn selective herbcides.

Spray Drift varies with:

Direction and velocity of the wind

Size of the spray droplets

Type of applicator

Type of spray or spray additives used.

The movement of herbicide vapours in the atmosphere can be minimized by:

The use of herbicides having low volatility

Applications at the proper rate

Used under proper environmental conditions where vaporization and vapour movement is minimal.  High temperatures, especially at the soil surface, give increased herbicide vaporization.

Choose a day when there is minimal breeze, and make the selective weed killer application in the early morning or later in the afternoon.  Do not mow three days before or after, minimum and when rain is not expected for 6 hours if the product is not showerproof.

Related Topics:

Lawn Weed Control

Knapsack Sprayers

Weed Control in Lawns


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