• Cactus mealybug

  mealybug are yellow-brown and not yet covered with wax. They are actively mobile and known as ‘crawlers’. From the second instar on, they are covered with [...] nymphal instar onwards are covered with a white waxy material in the form of powder, threads, spiky projections or platelets. Eggs are laid in a sticky, foamy [...] this pupa. The males lack mouth parts and are incapable of feeding. They have a brief lifespan during which they are wholly engaged in seeking females to fertilize

• Lyprauta

  which are small earthworms of the family Enchytraeidae. Damage symptoms The symptoms are superficial damage on roots. Especially the root tips are affected [...] spot on their wings. The eggs of Lyprauta sp. are greyish-black and spherical. Larvae of Lyprauta sp. are a transparent greyish white and have a long slender [...] body. The head is brown or reddish. The pupae are white to yellow and embedded in a dense web. Adult flies are long and slender and have a dark brown head

• Hemp russet mite

  nymphal stages are sometimes also called larva (1st stage) and nymph (2nd stage). The eggs are approximately 0.05 mm in diameter and adults are around 0.2 [...] russet mite All life stages of the hemp russet mite are extremely small and difficult to observe. They are elongated (torpedo-shaped), soft and segmented. [...] stems and petioles of the hemp plant and can cause stunting. When populations are large, the mites can also be found on the underside of leaves. This results

• Tomato russet mite

  russet mite All life stages of the tomato russet mite are extremely small and difficult to observe. They are elongated (torpedo-shaped), soft and segmented. [...] of legs, whereas other mite groups have four pairs. Eggs are roughly 0.05 mm in diameter and are laid on the underside of leaves, on leaf petioles, and on [...] When newly laid they are creamy white but turn to a patchy yellow as they age. The mites have two nymphal stages: sometimes they are also called larva (1st

• Chafers

  The chafers are beetles of the Scarabaeidae family. The larvae of both species live in the soil and feed on the roots of many plants. They are a serious [...] lay their eggs. Eggs are shiny and white. The eggs hatch after about four weeks and the larvae start to feed on roots. The larvae are white-coloured, C-shaped [...] serious pest that can cause substantial damage. The adults are not harmful. Damage symptoms Larval feeding on the roots can lead to yellowing and wilting of plants

• Cabbage leafroller

  caterpillars are much lighter and have dark lateral stripes. The caterpillars are relatively thin and measure up to 25 mm in length. They are slightly hairy [...] forming a “V” when at rest. At rest, the wings are held folded almost horizontally over the body. The antennae are thin and of medium length. The moths fly when [...] lateral stripes that are sometimes light in colour. The ventral surface is lighter than the dorsal, with hairs located in warty spots that are lighter than the

• Woolly apple aphid

  egg-laying females are produced in autumn but their eggs do not develop further. Adult viviparous (wingless) females of the woolly aphid are 1.2-2.6 mm long [...] trunk or main branches, are very frequently attacked. The aphids mainly spread through young, wingless nymphs which crawl or are blown by the wind from [...] from tree to tree. Sometimes a few winged aphids are produced in summer. Winged egg-laying females are produced in early autumn but their eggs do not develop

• Tomato leafminer

  absoluta ) are grey-brown with filiform antennae, alternating light or dark segments and recurved labial palps, that are well developed. Black spots are present [...] distinctive symptoms of damage done by the tomato leaf miner ( Tuta absoluta) are the blotch-shaped mines in the leaves. Caterpillars prefer leaves and stems [...] tissues, leaving the epidermis intact. Fruits can be attacked as soon as they are formed but the larvae only feed on green fruits. In case of serious infection

• May beetle

  larvae are relatively harmless, the older larvae are the most aggressive. In early spring they either start feeding again or when the larvae are fully grown [...] Overview May beetles are beetles from the Scarabaeidae family, and are plant-eating species from the Melolonthinae subfamily. Although this subfamily contains [...] of this genus, they are usually treated as a single group, sharing similar habits and biology. The larval stages of these beetles are harmful to crops, since

• Leek moth

  and flowering stages are most widely affected, but the seedling stage is sometimes affected in nurseries. Stored onions and garlic are also damaged. After [...] five larval stages, a pupa and the adult moth. The eggs are small, white and elliptical and are laid singly on the leaf of Allium plants. After a wandering [...] and produce the most severe damage. First instar larvae are ca 1 mm long, but mature larvae are ca 10 mm with a brown head capsule and . a yellowish-white