Northeast Region Certified Crop Adviser (NRCCA) Study Resources

In This Section

• PO 10 Weed life cycles
• PO 11 Weed survival mechanisms
• PO 12 Common weed identification
• PO 13 Dichotomous key
• PO 14 Timing of control
• PO 15 Mechanical weed control
• PO 16 Cultural weed control
• PO 17 Biological weed control
• PO 18 Chemical weed control
• PO 19 Herbicide site of action
• PO 20 Environmental affects herbicides performance
• PO 21 Problems associated with herbicide use

Competency Area 2: Weed Management

PO 17. Biological - Understand why biological control measures do not work as well with intensively managed crops as in extensively managed production systems/natural areas.

Biological control involves use of natural enemies such as insects, diseases, animals, and other plants. Biological control measures do not work as well with intensively managed crops as they do with natural areas because they are meant to be species specific and would only target a single weed per biological control species