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Pest of the month – Whitefly

Posted on May 08, 2015 by Potter & Rest

The rise in ambient temperatures in May means an explosion occurs in insect populations and the dreaded whitefly comes among our plants.

There are two distinct types of whitefly, which are in fact close relatives of greenfly, the Greenhouse Whitefly, Trialeurodes vaporariorum, and the Brassica Whitefly, Ayleyrodes brassicae. 

In the greenhouse and conservatory, most plants are attacked, but favourites include fuchsias, geraniums, cucumbers and tomatoes. The adult insects are white and moth-like, about 3mm in length.

As they feed, a sticky substance called honeydew is excreted. This in turn leads to the growth of ‘sooty mould’, a black fungus that covers leaves, flowers and fruit below the feeding site causing cosmetic damage and depriving the plant tissue of light.

How to control them?

Greenhouse Whitefly Traps


Sticky yellow traps for the control of whitefly, greenfly, blackfly, thrips and other flying insects.

Application: Hang just above plants

Features: Yellow colour attracts flying insects. Non-toxic, environmentally-friendly and suitable for use in organic systems.

Supplied with twist ties for easy application. 

Fruit & Vegetable Bug Killer


A rapid acting natural insecticide to control aphids, blackfly, greenfly, caterpillars and whitefly on garden fruit and vegetables throughout the season.

Application: For use outdoors, in greenhouses and on pot plants.

Active Ingredient: Pyrethrum. MAPP No: 15605.

Features: Can be used on all edible crops.

Shrub & Flower Bug Killer

A rapid acting natural insecticide to control aphids, blackfly, greenfly, caterpillars and whitefly on ornamental plants and flowers throughout the season.

Application: For use outdoors, in greenhouses and on pot plants.

Active Ingredient: Pyrethrum. MAPP No: 15597.

Features: For all ornamental garden plants.

Provado Ultimate Bug Killer ready to use spray

This contact and systemic action insecticide controls a wide range of pests, such as lily beetle, whitefly, scale, greenfly, red spider mite, blackfly, mealybug, thrips and leaf hopper for up to six weeks.

It can be used on a variety of flowers, fruit and vegetables, including aubergines, courgettes, cucumbers, leafy brassicas, lettuces and tomatoes.

Provado Ultimate Bug Killer Concentrate 2


A fast acting, contact and systemic action insecticide, which spreads throughout the whole plant helping to kill hidden pests too. It can be used to controlblackfly, greenfly, leaf hopper, lily beetle, mealy bug, scale insects, thrips, whitefly and woolly aphid for up to six weeks.

Safe to use on all ornamental plants, selected fruit trees or bushes and greenhouse crops including aubergines, herbs and tomatoes.

This product has an easy pour bottle meaning there is no contact with the chemical when measuring the insecticide.

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