• Geranium aphid

  adulthood. With each moult they shed white skin, betraying their presence in the crop. Acyrthosiphon malvae rogersii is holocyclic (i.e. they mate in autumn and [...] strawberry foliage, particularly along the petioles. In outdoor strawberries they reach their peak in June. Winged aphids are formed from May onwards and are [...] and produce eggs to overwinter) and monoecious (i.e. they do not change their host plant for overwintering). Wingless females are green or yellow green,

• Shore fly

  Scatella tenuicosta) do not attack plants directly, as they feed on green algae. However, they can transmit plant diseases and can be a nuisance to greenhouse [...] Scatella tenuicosta ) occur very commonly, often in the vicinity of water. They feed on algae. Other shore fly species have diverse feeding habits but the [...] is cylindrical. The larvae are found in the top layer of damp soil, where they also pupate. The adult shore fly is black, about 4 to 5 mm long, and stout

• Two-spotted spider mite

  adults often depends on the crop in which they occur (e.g. on cucumbers they are often yellow-brown, on tomatoes they are mainly red-brown). Both males and [...] damage to the host plant by feeding on plant sap. They mainly occur on the underside of leaves where they pierce the cells and suck out the contents. The [...] slow-moving and tend to cluster on the undersides of leaves, where they feed on plant sap. They produce fine webbing over the infested area. Damage: Spider mites

• Lyprauta

  roots and bark inside orchid pots. They produce acid webs (pH 2.7 or less) consisting of central tubes along which they move, as well as more net-like parts [...] s in the Netherlands. Dutch farmers call these larvae potworms, however, they should not be confused with the actual potworms which are small earthworms [...] symptoms are superficial damage on roots. Especially the root tips are affected. They become black and start to rot internally. Just above the damaged area, the

• Tomato leafminer

  whitish to yellowish after emerging. They mine inside the leaf, stem or fruit. In the second to fourth instars they become greenish with a black band behind [...] or on the surface of a leaf, in a curled leaf or in a mine. If they leave the mines they build silk cocoons on the leaflets or in the soil. When pupation [...] blotch-shaped mines in the leaves. Caterpillars prefer leaves and stems, but they may also occur underneath the crown of the fruit and even inside the fruit

• Whitefly

  hatching they are actively engaged for several hours in seeking a suitable place on the leaf where they can feed. Once they have found such a spot, they remain [...] belong to the family Aleyrodidae. They are called "whiteflies" because they are typically white or yellowish in color, and they are often found on the undersides [...] many different environments, but they are particularly common in greenhouse settings and in agricultural fields. They feed on the sap of plants, which

• Citrus mealybug

  breadth. Seen dorsally, they have an oval form; they are soft and covered with a fine waxy material. They move very little. They can be distinguished from [...] filaments’ . The tail filaments are always shorter than 20% of body length. They produce little wax, so that the light yellow to pink body is visible through [...] running over the body. The adult males are short lived and can be hard to spot. They are smaller than the females, have two pairs of wings and two long tail filaments

• Large blackberry aphid

  leaves and start to reproduce parthenogenetically. They are very mobile and drop from the plant when they are disturbed. Winged aphids usually appear in June [...] females. Aphids moult four times before reaching adulthood. With each moult they shed white skin, betraying their presence in the crop. Wingless females of [...] June and July and migrate to new canes or host plants where they produce wingless aphids again. In October to December winged aphids appear again. These

• Large raspberry aphid

  leaves and start to reproduce parthenogenetically. They are very mobile and drop from the plant when they are disturbed. Winged aphids usually appear in June [...] females. Aphids moult four times before reaching adulthood. With each moult they shed white skin, betraying their presence in the crop. Wingless females of [...] June and July and migrate to new canes or host plants where they produce wingless aphids again. In October to December winged aphids appear again. These

• False spider mites

  greenhouse ornamentals . Tenuipalpidae are known as false spider mites because they closely resemble spider mites (family Tetranychidae ) or as flat mites because [...] mites ( Tenuipalpidae ) are usually found on the underside of leaves where they cause a brown, scabby discolouration spreading from both sides of the main [...] Most false spider mites ( Tenuipalpidae ) are brick-red to yellow in colour. They have the same body shape as spider mites but are usually smaller. The different