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The caterpillars of both the small and large cabbage white butterflies are are the two culprits. The first is pale green with a body up to 2.5cm long, the second is bigger at 4cm and is yellow with black markings. The adult butterflies lay eggs

These tiny, sap-sucking pests may be only 0.5mm long but they can wreak havoc in a greenhouse or on houseplants indoors. For most of the year they are a pale green colour with two dark spots on their back; it's only in autumn and winter

The larval form of a Lepidopteran. They are voracious phytophagous feeders and considered a pest.

An insect that attacks plant roots. This pest can be controlled using pesticides.

A covering (traditionally bell-shaped) for the protection of plants from cold temperatures, frost, birds and pests.

An insect of the order Hymenoptera. They're considered a pest in the summer when they feed on ripe fruit.

Sap-sucking insects of the family Aleyrodidae. A particular pest of the greenhouse, whitefly can be very destructive.

Click beetle larvae that live in the soil. They're a pest that attacks the roots of many crops, including tubers and bulbs.

Plants that work well together, either aesthetically, because their colours are complementary or they flower at different times, or functionally, because they benefit one another, with one plant perhaps repelling pests that prey on the other.

Learn environmentally friendly methods for controlling aphids, and other garden pests with Monty's guide to organic insecticides and how they work. Monty also talks you through how to make your own, organic pesticide.summerAdvice on aphids and other