WEED CONTROL METHODS CONT .
NQ DRY TROPICS WEED FREE pg . 11
compete weeds and prevent them from establishing .
CHEMICAL CONTROL
This is the use of herbicides to treat the weeds . This can be a very effective method of treating small infestations , reducing the size of large infestations , controlling regrowth after initial control and as part of an integrated pest management approach . It is important to consider the timing , application method and potential impact on non target species . Care must be taken to ensure the right herbicide is used in a safe manner . This information is supplied on the product label .
• Foliar Spraying
Foliar spraying is the application of herbicide to the leaf and stems of plants , usually using either a boom or handheld spray unit .
• Basal Barking
This is the application of herbicide in a carrier ( usually diesel ) to the bark of a woody weed up to a height of approximately 30 centimetres . If there are any branches in this area they must also be treated to a distance of at least 10 centimetres . The herbicide is dribbled onto the stem in a way that completely covers the entire stem from ground level to the required height . In many cases , a small amount applied to the soil around the base will also help .
WEED CONTROL METHODS CONT .
• Frilling
This method involves gently cutting the bark using a small hand axe . The bark is then bent out and herbicide is injected directly into the cut .