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Nelson Mining Resource <br /> Integrated Noxious Weed Management Plan <br /> ' August 2019 <br /> Page 18 <br /> 5.4 BASIC BIOLOGICAL CONTROL GUIDELINES <br /> ' Biological controls are a good option for larger infestations. Expect to wait a few years for the <br /> insects to establish and achieve optimum results. Once established, biological controls tend to <br /> ' persist and provide control for many years. <br /> Not all sites are suitable for biological control. Biocontrol agents are affected by the environment <br /> ' and climatic/cultural conditions may inhibit their efficacy.The use of these insects will also require <br /> some maintenance and considerations for their lifecycle and behavior. For more information, <br /> ' contact the Palisade Insectary of the Colorado Department of Agriculture. <br />