My vegetables were badly damaged by whitefly last spring and summer. I don’t use chemicals or high-nitrogen fertilisers so what caused the infestation? How can I minimise the damage next time?
Dani Chatfield, Vic Tiny whiteflies suck sap and can spread viruses. They’re common pests that reproduce rapidly; early control is best. Yellow sticky traps are effective (from greenharvest.com.au or nurseries, or make your own) or use an insecticidal soap (Nature’s Way Vegie and Herb Spray or Natrasoap), sprayed thoroughly and repeated every five days. Natural predators include spiders, lacewings, hoverflies and ladybirds. See goodbugs.org.au to purchase parasitic wasps.