• Hemp russet mite

  quality. Other signs of damage include dull, greyish, or bronzed leaves and upward curling of leaf edges. Life cycle and appearance of Hemp russet mite All [...] caused by the mites sucking out the contents of plant cells. Hemp russet mite develops on the stems and petioles of the hemp plant and can cause stunting. When [...] found on the underside of leaves. This results in smaller leaf size and suppressed bud growth leading to a reduction in the number of buds and dwarfed buds

• Oleander scale

  symptoms Scale infestation can be seen by the appearance of the scale armour on stems, leaves and fruits of hosts. Infestations on the leaves and stems may cause [...] photosynthetic area of the plants, leading to lower yield. Damage to fruit occurs in heavy infestations, where spotting and often deformity of fruits affects [...] whose apex is off-centred. This scale resembles a miniature fried egg with a diameter of 2 mm. The newly hatched crawlers are roughly 0.3 mm long. They quickly

• Koppert One

  evaluates the harmfulness of various pesticides, considering both direct impacts like mortality or hindered development from eggs or pupae, as well as indirect [...] Side Effects app Understand the impact of pesticides on beneficial organisms and pollinators Pesticides can have both direct and indirect effects on natural [...] indirect effects such as reduced fertility (egg laying), problems with regard to moulting, or a repellent effect. The data within this database serves as

• Thrips

  deposits an egg, she makes an opening in the plant tissue. The eggs are laid in leaves, flower petals and in the soft parts of stalks. On the leaves of sweet [...] smaller and lack wings. One of the most distinctive features of thrips larvae is their characteristic "frass," which is a type of waste material that they [...] transmission of viruses, the best known of which is tomato spotted wilt virus (TSWV), mainly transmitted by F. occidentalis. Life cycle of thrips Thrips

• Large blackberry aphid

  blackberries. Damage symptoms High populations of large blackberry aphids can reduce yield. Life cycle and appearance of Large blackberry aphid Aphids have a complex [...] . The aphids overwinter as eggs on blackberry plants. After emerging in spring, the aphids mainly feed on the underside of leaves and start to reproduce [...] complex life cycle, with both winged and wingless forms of adults and a great variety in colour. In greenhouses, reproduction takes place by parthenogenesis

• Stratiolaelaps scimitus (Hypoaspis miles)

  soil and at the base of plant stems. The reduction of the infestation level occurs at a slow but steady rate. Feeding behaviour of Stratiolaelaps scimitus [...] on the rear end of the body. The eggs, larvae, and first nymphal instars are white, with nymphs becoming light brown as they age. The eggs are white, oval [...] predatory mite occurring naturally in several parts of the world. This predatory mite controls larvae of sciarid flies (fungus gnats), thrips pupae and other

• Pear psylla

  bark of pear trees. The adults become active in spring and start to feed on young leaves and flowers. Eggs are deposited in crevices of the bark of twigs [...] season may affect the harvest of the next year by weakening or killing fruit buds. Pear psyllas excrete large amounts of honeydew. Sooty moulds often grow [...] appearance of Pear psylla Adults pear psyllas are 2-3 mm long and orange red to blackish. They have white, longitudinal stripes on the back of the thorax

• Shore fly

  scale that growth, particularly of young cuttings, can be retarded. Life cycle and appearance of Shore fly The life cycle of the shore fly ( Scatella tenuicosta [...] commonly, often in the vicinity of water. They feed on algae. Other shore fly species have diverse feeding habits but the larvae of most species feed on rotting [...] tenuicosta ) has the following stages: egg, three larval instars, a pupa and the adult fly. The eggs are laid singly and are bean-shaped. A first instar larva

• Leek moth

  cream-coloured, silk cocoon made of characteristic meshes spun on the surface of the leaves or on the flower-stalk of the host plant. The pupa is 7-8 mm [...] with a wing span of 15-16 mm. Their general colour is grey-brown with a typical white triangle in the middle of the posterior edge of the forewings. The [...] found in some Asian countries and has been introduced to parts of Canada. The larvae of Acrolepiopsis assectella feed on cultivated Allium species, primarily

• Buckthorn-potato aphid

  transmission of viruses. Life cycle and appearance of Buckthorn-potato aphid Aphids have a complex life cycle, with both winged and wingless forms of adults [...] The aphids overwinter as eggs on buckthorn. After emerging in spring, the aphids mainly feed on the underside of leaves of their summer hosts and start [...] n distribution and is a major pest of potatoes, where it also transmits viruses. It also attacks a large number of other crops, for instance sweet pepper