True or False: Contact herbicides require partial coverage to effectively control weeds.

Contact herbicides function by affecting the parts of the plant that they come into direct contact with, usually leading to immediate tissue damage and potentially killing the plant. For these herbicides to be effective, they generally require complete coverage of the target weed surfaces, including leaves and stems. This is because the active ingredients in contact herbicides do not move within the plant; they need to be applied to all the plant parts that you want to impact.

Thus, the assertion that partial coverage is sufficient for effective control is incorrect, as it may lead to ineffective weed management and allow the plant to survive and regenerate. Therefore, this statement is false, confirming that complete coverage is necessary for optimal results with contact herbicides. Understanding the application requirements of contact herbicides is critical for achieving successful weed control in various agricultural and landscaping settings.