Whitefly

There are 2 main species present in New Zealand, Greenhouse Whitefly (Trialeurodes vaporariorum) and Citrus Whitefly (Orchamoplatus citri).

Whiteflies are small white sap sucking insects 1-2mm in length that resemble miniature moths with a wingspan of around 3mm. Both the nymphs and the adult insects are sapsuckers. Their feeding can harm the vigour of the plant, and help spread disease. As they feed they excrete a sugary substance (honeydew) and if left can allow sooty mould to grow on the leaves. During warmer periods they can breed prolifically.

Prevention

Nicotiana (and attractive flower) will attract whitefly and can be grown to provide early warning of their presence.

Various beneficial predatory insects will prey on whitefly and can help control numbers. To help attract beneficial predator insects grow a wide array of flowering plants including: alyssum, borage, hyssop, lavender, will help attract them. For more ideas click here

Plant shoofly around your garden as this helps repel them.

Treatment

Spray with Mavrik. Repeat spraying in two-weekly intervals if the problem persists.

Where possible, spray in the evening to avoid affecting beneficial insects.

Natural Option

Spray affected plants  with Bugtrol. Repeat spray within two weekly intervals if the problem persists.

Where possible, spray in the evening to avoid affecting beneficial insects.

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