Eastern fence lizard

The Eastern fence lizard (Sceloporus undulatus) belongs to the order Squamata and the family Phrynosomatidae. While often considered beneficial for its role in insect control, this species can become a nuisance in specific agricultural settings, particularly in nurseries, vineyards, or small-scale vegetable gardens where soil integrity is critical for plant health.

The biology of this species is characterized by a strong dependence on solar radiation for thermoregulation. These lizards are diurnal and prefer habitats with abundant sunlight and structures for climbing or basking. Their reproductive cycle involves laying eggs in warm, loose soil, which can inadvertently conflict with the preparation of garden beds during the spring and summer months.

The damage caused by these lizards is primarily mechanical. By digging shallow burrows in the soil for shelter or egg-laying, they disrupt the root systems of delicate seedlings and ornamental plants. This disturbance often causes the plants to lose contact with essential moisture in the soil, leading to rapid wilting or inhibited development of the crop.

The pest status is recognized through the observation of excavated soil around the base of vegetable crops and physical breakage of fragile shoots. Furthermore, in high-density areas, their constant movement across foliage can cause minor physiological stress to the plants, making them more susceptible to subsequent secondary environmental pressures.

Effective protection strategies focus on habitat modification and physical exclusion to deter the lizards from nesting areas.

• Regular tilling of the soil to prevent the establishment of long-term burrows.
• Use of protective mesh or floating row covers around young plant clusters.
• Clearing away piles of rocks, firewood, or debris that serve as basking sites for the lizards.
• Incorporating ground cover or mulch that makes the soil surface less attractive for nesting.