 Although significant problems, fungi are less likely to be the cause of plant morbidity than poor drainage or soil conditions.The larvae of the Macadamia leafminer ("Acrocercops chionosema"), a moth, burrow along and disfigure the waratah's leaves, and are mainly a problem in lowering the value of cut flower crops.More problematic is the larger caterpillar of another moth, the Macadamia twig girdler Macadamia twig girdler ("Xylorycta luteotactella") which can burrow into and disfigure the developing flowerhead.