CA BRANCH 3 Structural Pest Control Exam Study Guide Questions with Complete Solutions

CA BRANCH 3 Structural Pest Control Exam Study Guide Questions with Complete Solutions How can you tell the difference between wood suffering from brown rot and wood suffering from white rot? - Correct Answer Wood infested with brown rot typically: • appears dark brown, • shows excessive shrinkage, • develops cross-grain cracking, and • can be crushed easily to form a brownish powder. Wood infested with white rot on the other hand, often: • appears whiter than normal, • shows normal shrinkage, • does not crack across the grain, • is spongy to the touch. What is the difference between the stains caused by stain (sapstain) fungi vs. mold fungi? - Correct Answer Sapstain fungi live on the starch in wood cells. These fungi may discolor the sapwood entirely or in patches. This stain is deep within the wood and cannot be removed by brushing or planing.