Which of the following is a management tactic used to control nematodes?

Prevention is a crucial management tactic used to control nematodes effectively. This approach involves implementing strategies that minimize the introduction and establishment of nematodes in the field. Practices such as selecting resistant crop varieties, managing soil health, and rotating crops can significantly reduce the nematode populations in the soil and prevent their impact on future crops. By focusing on preventing nematode infestations before they occur, growers can maintain healthier crops and reduce the need for chemical inputs.

In contrast, choices like increased irrigation, soil compaction, and excessive fertilization may not effectively control nematodes or could even exacerbate the problem. Increased irrigation can promote conditions favorable for nematode survival and reproduction, while soil compaction can reduce root growth, limiting the crop's ability to avoid nematode stresses. Excessive fertilization may contribute to nutrient imbalances, which can also affect plant health and resilience to pest pressures. Thus, proactive prevention is a more reliable and sustainable method for managing nematode populations.