Which types of pests are typically targeted in non-soil fumigation?

Non-soil fumigation is primarily used to target specific types of pests that can affect stored products, structures, or agricultural products. The correct answer focuses on insects, fungi, nematodes, and rodents, as these are common threats in environments where fumigation is applied.

Insects are targeted because they can infest a wide array of materials, from crops to stored foods. Fungi are included as they can lead to spoilage and disease in both agricultural and stored products. Nematodes, which are microscopic worms that can damage plant roots and produce, are also effectively controlled through fumigation. Finally, rodents pose a significant risk in food storage areas and agricultural settings due to their ability to contaminate and damage products.

Other options involve pests that may not be directly addressed through non-soil fumigation. For instance, targeting weeds or birds does not typically fall under this category's intended use, as these species are managed through different types of control methods. Overall, option B accurately reflects the primary focus of non-soil fumigation practices.