In glasshouses, practive good hygiene and keep conditions dry.
Some plants can be treated by plunging into hot water and then cold water. The timings and temperature are critical, as there is a risk of damaging the plant.
Strawberry runners - 10 minutes at 46 C (115 F)
Ferns - 10-15 mins at 43.5 C (110 F)
Small pot begonias - 30 mins at 48 C (118 F)
Mint runners - 10 mins at 46 C (115 F)
After the final cold plunge, plant up in sterile potting compost, and position out of possible reinfestation.