Lyprauta

Just above the damaged area, the roots produce large numbers of new branches. This ultimately results in a reduced number of flower stems and a longer vegetative [...] distinguished by the wing pattern of adults. Adults of P. trinidadensis have a variation of dark-coloured markings spread over their wings. Adults of L. cambria [...] head with short antennae. The thorax is brownish-yellow and the abdomen brown with yellow stripes. The wings are transparent light brown with clearly visible

Grey mould

cinerea ) is part of the foot rot complex, which causes rotting of the foot and may cause death of the plants. In cucumber and tomato the fungus causes lesions [...] compounds that kill the plant cells and then uses the content of the plant cells as nutrients. On the infected area, new spores are formed within a few days. Under [...] lesions on pruning wounds. These lesions may encircle the stem, so the part of the plant above the lesion wilts and dies. In vegetables and strawberry,

Verticillium wilt

upwards with the transpiration stream. As a defence mechanism, the plant produces gum in the vessels. The presence of both the fungus and the gum causes [...] recover at night. The symptoms may occur only in parts of the plant. Cutting the stalk horizontally reveals a slight discolouration of the vessels, brown [...] residues. The fungus infects the roots of plants, directly or through wounds caused by for example nematodes. The fungus then grows into the vessels of the plant

Bacterial spot

as they grow. The centre of the lesions may fall out as they become drier. Under humid conditions, the spots may merge with lesions on the petioles and [...] green fruits. The specks grow into brown spots that look like scab. These spots may be surrounded by a halo. In pepper, the spots on the leaves are also [...] also round and small to start with and slightly raised from the leaf surface. They occur on the abaxial (underside of) leaf surfaces and may enlarge into

Glasshouse potato aphid

deformations in the growing tip of the plant. Precisely where the plant is pierced is unimportant. The piercing of the lower leaves in the crop can cause [...] abdomen at the base of the cornicles. Alate (winged) females are yellow-green, with a brown head, a dark thorax and a dark abdomen that has pale to dark [...] growth above with lumpy leaves and curled leaf margins. The immediate effects of piercing by the aphids are visible in lower leaves in the form of yellow patches

Common cockchafer

General The cockchafer ( Melolontha melolontha) , also known as the doodlebug or May bug is a European beetle of the genus Melolontha, in the family S [...] adults feed on the leaves of trees, mainly on oak, maple, beech and plum. Life cycle and appearance of Common cockchafer The life cycle of the common cockchafer [...] melolontha ) has the following stages: egg, three larval instars, a pupal instar and the adult beetle. The adult beetle is 25 to 30 mm long, with a dark head

Yellow rose aphid

South America. It attacks plants of the family Rosaceae and is a pest of strawberries and roses. Damage symptoms The yellow rose aphids usually live in [...] Nymphs and adults extract nutrients from the plant and disturb the balance of growth hormones. As a result, the plant’s growth is retarded giving rise to [...] Life cycle and appearance of Yellow rose aphid Aphids have a complex life cycle, with both winged and wingless forms of adults and a great variety in colour

Cactus mealybug

appearance of Cactus mealybug Mealybugs get their name from the fact that the body of the females from the third nymphal instar onwards are covered with a white [...] flowers. Depending on the host plant species, infestations with cactus mealybug cause discoloration of the plants and later necrosis of the tissue. Plant de [...] covered with white waxy exudate and become more sedentary and only move occasionally. After the second instar, the males form a pupa. After a complete

Tomato moth

fruit. The second generation of larvae often causes greater loss of fruit than the first. Life cycle and appearance of Tomato moth The forewings of adult [...] oleracea) are a reddish-brown with a feint light brown, kidney-shaped marking, and a thin, toothed white line along the posterior edge of the forewing. As [...] while the abdomen is a lighter grey-brown. The females of the tomato moth (Lacanobia oleracea) deposit their spherical eggs on the underside of leaves

Diamond back moth

pointed toward the apex. The tips of the wings appear to turn upward slightly when viewed from the side. In males, the upper two-thirds of the forewings are [...] suffused with ochre or mixed with whitish scales. The lower one-third of the forewing is ochreous-white, with a nearly white upper edge. In females, the upper [...] upper two-thirds of the forewings are light ochreous and the markings are like those of the males. The back is marked with a broad cream or light brown band