Which statement about forest disease is incorrect?

The statement regarding Annosum Root Rot's association with heavy-clay soils that are poorly drained is the incorrect one. Annosum Root Rot is primarily caused by the fungus Heterobasidion annosum and is typically associated with well-drained, sandy soils rather than heavy clay soils. This disease is often found in environments where forest management practices, such as logging, create openings that allow spores to infect freshly cut stumps.

Understanding the conditions under which different forest diseases thrive is crucial. In this case, it is essential to recognize the appropriate environmental conditions that favor Annosum Root Rot, indicating that poor drainage often leads to a different set of problems for trees, which might include other root diseases or stress factors unrelated to this specific pathogen.

The other statements are accurate and reflect the characteristics of their respective diseases. Littleleaf Disease is indeed caused by root pathogens, and oak-pine forest types do show increased susceptibility to Rust Disease under the right conditions. Foliar Diseases can reduce the photosynthetic capability of trees, subsequently making them more vulnerable to insect infestations as their overall health declines.