Agave americana · Succulent
Scale insects: Rub off with a cotton bud dipped in methylated spirit or use an insecticidal soap.
Root rot: Ensure sharp drainage with gritty compost and avoid watering during winter dormancy.
Vine weevil: Apply nematodes to the soil in autumn or use a systemic insecticide drench.
Mealybug: Isolate the plant and treat with a suitable horticultural oil or insecticide.
Winter wet damage: Protect outdoor plants with a cloche or clear plastic sheeting in winter.