Pests
Pests aren’t usually too much of a problem on outdoor crops, but in greenhouses commons pests include aphids, glasshouse whitefly and red spider mite (properly known as two-spotted spider mite). Commercial growers use biological control agents to manage these pests and these are available on our website: Natural pest control. Soft soap is useful for reducing the numbers of pests – use distilled, rain or soft tap water to dilute it.
There is a list of insecticidal soaps and oils here : Pesticides for Home Gardeners RHS Advisory Service February 2015.