How to identify whitefly
Whitefly in adult form are small, white and winged insects that gather at the top of a plant, if disturbed, they fly away. The adults and larvae whitefly suck sap from leaves, causing poor growth and leaf damage. This activity from the whitefly also results in mould growing on the lower leaves as they excrete excess sugar from the sap, coating the lower leaves.
Whitefly can infest your greenhouse or conservatory if you bring in an infected plant or if there are open windows or vents.
Whitefly can lay up to 200 eggs in groups underneath the leaves so infestation can get out of control quickly. Tiny larvae will begin to emerge and search for a feeding site, then they lose the ability to move. This is called the “scale stage” and you can identify this as they will be 2mm long, pale green and live under the lower leaves.
Note, Whitefly can be mistaken with Aphids. Aphids will shed their skin and leave them on the leaves, whitefly will fall off completely if the plant is shaken.
If you find the problem is Aphids and not Whitefly, you can use Aphidus, Ladybirds or Lacewings instead.
How to Use Encarline F
• Introduce Encarsia (a small parasitic wasp) as soon as you notice the first Whitefly, the daytime temperature needs to average at around 10˚C.
• You will notice on the cards that there are tiny black dots, these are the Encarsia. The cards simply need to be hung on the lower leaves of the plant.
• The Encarsia will soon emerge from the cards and lay an egg inside the whitefly when the whitefly are in “scale stage” and soon after another Encarsia hatches from out of the dead whitefly.
Every Encarsia is able to lay up to 300 eggs inside 300 whitefly scales in 30 days.
|Pack Size||50 Cards|
|Species controlled||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||1 card treats up to 10m².|
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