Type: Parasitic wasp.
How it works:
Adult wasp lays 60 - 100 eggs singly into whitefly scales, which turn black as the parasite develops.
Glasshouse whitefly (Trialeurodes vaporariorum) and limited control of cotton whitefly (Bemisia tabaci).
When to use:
Encarsia are introduced as pupae either on cards, which are hung within the crop or as loose black scales.
Rates of use:
Cool grown crops: 3 wasps per 1m2 until week 12 and then 1 wasp per 1m2 per week.
Heated crops: 0.5 to 1 wasp per 1 m2. If whitefly are present increase rate to 5 wasps per 1 m2 for 6 weeks.
Poinsettia: Preventative is 1 wasp per 3 plants per week; curative or where Bemisia tabaci (cotton whitefly) is suspected then 1 wasp per plant per week.