What damage can be caused by billbug larvae?

Billbug larvae are known for their specific feeding habits, which primarily target the stems and crowns of grass plants. This feeding often leads to substantial damage, including hollowness and decay within the plant tissues. The destruction of stems and crowns can significantly weaken the grass, leading to reduced vitality and increased vulnerability to environmental stressors such as drought or disease. This feeding behavior can ultimately result in thinning lawns and dead patches, impacting the overall health and appearance of turfgrass.

The other answer choices do not accurately reflect the specific type of damage associated with billbug larvae. While severe wilting of grass and various plant diseases can occur due to different factors or pests, they are not primarily caused by billbug larvae. Increased growth rates are contrary to the effects of billbug damage, as the weakening of the grass leads to stunted growth rather than enhanced growth. Understanding this specific damage helps in identifying and controlling infestations effectively.