Aphids

throughout the world. Aphids form a single, very large group of insects: the super- family Aphidoidea, belonging to the order Hemiptera . The aphids discussed [...] plants in several ways, and the damage can vary depending on the species of aphid and the type of plant being attacked. The following are common signs of [...] Aphids feed on the sap of plants, which can cause the leaves to turn yellow or become distorted. The damage is often more pronounced on the younger leaves

Cotton aphid

including the cucumber mosaic virus. Nymphs and adults extract nutrients from the plant and disturb the balance of growth hormones. As a result, the plant’s [...] skin, betraying their presence in the crop. The cotton aphid can be distinguished from other aphids by the colour of the two cornicles (siphunculi). These [...] as chrysanthemum and kalanchoe. The cotton aphid ( Aphis gossypii ) is distributed throughout the world but prefers the warmer regions. It has been a pest

Common asparagus beetle

Common asparagus beetle The life cycle of the asparagus beetle has the following stages: egg, 4 larval instars, a pupal instar and the adult beetle. Adult [...] larvae feed on the leaves of asparagus. As the larvae feed, they secrete a blackish fluid, consisting of faecal material, which may contaminate the plant. Life [...] three pairs of stout, light brown legs. When fully grown, the larvae drop to the ground to pupate. The adult stage overwinters and starts a new cycle next spring

Lyprauta

are small earthworms of the family Enchytraeidae. Damage symptoms The symptoms are superficial damage on roots. Especially the root tips are affected. [...] vegetative stage. The root damage can also form entry points for pathogens. Life cycle and appearance of Lyprauta The adults of the three species can be [...] dark brown head with short antennae. The thorax is brownish-yellow and the abdomen brown with yellow stripes. The wings are transparent light brown with

Northern Corn Rootworm

feed on the foliage, pollen, silks and developing kernels of corn, with the following consequences: When corn silks are cut all the way back to the ear and [...] diapause; the eggs of “semivoltine” Diabrotica barberi remain dormant in the soil for two winters. This allows the larvae to effectively skip the field’s [...] every year. The rootworms undergo three larval instars then pupate in the soil near the corn roots in late June or early July. After 5–10 days the adults begin

Green peach aphid

from the plant and disturb the balance of growth hormones. As a result, the plant’s growth is retarded giving rise to deformed leaves or, if the infestation [...] different families. Damage symptoms Of all the aphids , the peach potato aphid ( Myzus persicae subsp. persicae ) is the most important vector of viral diseases [...] quantities of sap to get sufficient protein. The excess sugar is secreted in the form of honeydew, making the crop and its fruit sticky. Black fungal moulds

Crane flies

again and feed voraciously when the soil begins to warm up in spring. The larvae pupate below the soil surface in summer. The pupal stage lasts about two weeks [...] General The larvae of crane flies , called leatherjackets, live in the soil and feed on roots and shoots (which they pull into the ground of mainly grasses [...] adults emerge, part of the pupal case can be found sticking out above the soil surface. Adult common crane flies emerge from the soil in late summer to

Cutworms

will occasionally tunnel into the growing stalk, disrupting the sap flow in the plant. Life cycle and appearance of Cutworms The adults of Agrotis spp. have [...] worldwide. Important species are for instance the black cutworm Agrotis ipsilon and the turnip moth Agrotis segetum . The larvae of these moths usually feed on [...] and hide in the ground during the day. Damage from these instars is usually observed as a cutting of young seedlings, often causing death of the cut seedlings

Potato aphid

from the plant and disturb the balance of growth hormones. As a result, the plant’s growth is retarded giving rise to deformed leaves or, if the infestation [...] quantities of sap to get sufficient protein. The excess sugar is secreted in the form of honeydew, making the crop and its fruit sticky. Black fungal moulds [...] characteristic of the potato aphid and is particularly visible in the nymphs. Immatures have a light dusting of whitish-grey wax. The aphids instantly fall

Spider mites and other mites

n of the leaves, with the affected areas curling and twisting. This damage is caused by the mites feeding on the plant tissue, which disrupts the growth [...] and the availability of food. Here's an overview of the life cycle of plant mites: Egg: The life cycle begins with the female mite laying eggs. The eggs [...] During this stage, the larvae start to feed on plant sap and undergo molting to transition to the next stage. Nymph: After the first molt, the mite larvae become