Apply herbicide when the majority of winter annuals have emerged and are at the right stage for control. One final consideration with fall weed control is crop rotation. The list of fall-applied products is fairly short for fields that will be in canola next year. Fall weed control on fields planned for canola Fall weed control and frost Foxtail barley and fall weed control Top 10 considerations to prep for next year Weed management before and after harvest Glyphosate-resistance and general herbicide-resistance prevention management tips from Monsanto.
Sign Up. Ask a Question. Keep the conversation going. Ask a follow up question to an article, ask something new, or give us your feedback. Skip to content. Was this article helpful? Let us know if you liked the post. Make sure that you thoroughly read and understand the instructions that your weed killer comes with.
Some chemicals could prove to be hazardous to your lawn or your pets. Some killers can be used multiple times on the same patch of land with no negative side-effects, while others are strictly one-use only. Young weeds that are just sprouting are particularly vulnerable to weed killers. Mature weeds can be much harder to deal with, as can perennial weeds who have stronger root systems. You can harm the grass in drought conditions When it is unlikely to rain for at least 6 hours On dry grass. Wet grass will dilute your weedkiller In calm weather — wind will blow spray even from a watering can sprinkle bar Avoid frost or freezing conditions which may occur in spring Avoid strong sunshine In summer it is best to apply weed killer in the cooler evenings Any time after fertilising.
Let the feed kick in one to two weeks then treat the weeds to get a better weed kill After mowing. Leave at least 2 days if applying liquid lawn weed killer to the whole lawn. If you mow close and chop the leaves off the weeds there is nothing left to spray!
How often can you use lawn weed killers? Next article Maintaining a Weed Free Lawn. Related videos for this article. Learn more. Regardless of how much we fight off weeds, they make a comeback. What about specific climates or times of the day? There are also safety issues around our home that we have to consider and emergence herbicides. We need to understand how weed killers work before we spray.
How is it that a sprayed weed killer kills the weeds but not grass other plants? Weed killers interfere in the growth of weeds by blocking protein production or destroying root formation. We can use pre-emergence herbicides on an established lawn to disrupt the weed life cycle, especially for summer weeds. Pre-emergence herbicides examples are benefin and dithiopyr. Time the spraying of weed killer before weeds germinate, which is usually in early spring.
Then, we can reapply the week killer eight weeks after the first spraying. For post-emergence herbicides , we can use glyphosate chemical to kill weeds by absorbing it into the plant tissue.
Glyphosate-based chemicals achieve the best results when applied to young weeds. Not only should we protect ourselves when spraying weed killer by wearing long sleeves, gloves and goggles, as well as using a respirator and protective headgear, but we should protect others.
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