(b) if he or she has cause to believe that a notifiable plant pest may be present on any land have the power to enter on such land and without warrant to carry out survey and detection programmes as well as to treat, destroy or remove planting material, fruit, vegetable, plant product, plant pest and soil, but he or she shall inform the occupier, if present at the time, of the intention to enter, search, examine, treat, confiscate or destroy such planting material, vegetable, plant product, plant pest or soil.