Circular scale

sub-central point which is sometimes pale. When the scale is lifted, the insect beneath is yellow and up to 1.7 mm long. The adult male is 0.7 mm long and has [...] spots with paler margins, on both surfaces of shaded leaves of the host plant. Life cycle and appearance of Circular scale Female nymphs and adults have [...] and subtropical parts of the world, mostly in association with the citrus industry. In more northern countries of its range, it occurs in greenhouses. In

Chafers

General 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 [...] There, secondary damage is often caused by birds and small mammals digging for the grubs to eat them. Life cycle and appearance of Chafers Adult Amphimallon [...] mate. During the night the females move to the ground to lay their eggs. Eggs are shiny and white. The eggs hatch after about four weeks and the larvae start

Broad mite

to the damage caused by viruses. The typical pattern of damage consists of malformation and distortion of the above-ground growth of the plant. The mites [...] appearance of Broad mite The life cycle of tarsonemid mites has the following stages: egg, larva, and adult. The larvae have three pairs of legs, adults [...] to cause the leaf to turn brown and curl up. A typical indication of an attack of broad mite ( Polyphagotarsonemus latus ), is the appearance of dark brown

Impatiens thrips

patches on leaves and the black dots of their excreta indicate their presence in the crop. The vigour of the plant is reduced by loss of chlorophyll. When [...] eggplants. It lives exclusively on the leaves and is often present on weeds in greenhouses. Life cycle and appearance of Impatiens thrips Impatiens thrips [...] specifically on the leaves. Eggs are deposited in the leaf tissue, while subsequent stages are found on the upper- and undersides of the leaf. Pupation occurs

Cactus mealybug

eventually die. Life cycle and appearance of Cactus mealybug Mealybugs get their name from the fact that the body of the females from the third nymphal instar [...] but its origin is not clear. It is now found on many greenhouse-grown succulents around the world as it was probably distributed by the trade in ornamental [...] infestations with cactus mealybug cause discoloration of the plants and later necrosis of the tissue. Plant deformations can also occur. Heavily infested

Onion thrips

black dots of their excreta indicate their presence in the crop. The vigour of the plant is reduced by loss of chlorophyll. When infestations become serious [...] pupa, and finally the adult insect. The eggs of the onion thrips (Thrips tabaci) are laid in leaves, flower petals and in the soft parts of stalks. They are [...] cells of the surface tissues and sucking out their contents, causing the surrounding tissue to die. The resulting silver-grey patches on leaves and the black

Natutec Drive

through tubes over crops. The Natutec Drive is applicable in any situation and based on the specifications of the greenhouse. The Natutec Drive module can [...] exacly onto the crop. Because of its unique design, the natural enemies suffer no damage when the blower is used. Application This product is only available [...] evenly over the crop to get the most effective pest control. The product is a unit with a patented release system to disperse material into an airstream

Greenhouse whitefly

whiteflies reduce the aesthetic value of crops. This is particularly important in ornamentals . Life cycle and appearance of Greenhouse whitefly The greenhouse [...] General The greenhouse whitefly ( Trialeurodes vaporariorum ) is one of the major pests of vegetable and ornamental crops in greenhouses throughout the world [...] and the excess is excreted as honeydew, with larger larvae expelling large quantities. The damage that whiteflies cause to a crop is the result of sucking

Oak processionary moth

months. From the 5th instar on, the larvae start building silken nests at the base of lower branches, on the trunks or at the base of the trunks, which [...] and also in parts of the Middle East. Damage symptoms The nests of caterpillars on infested trees are clearly visible. The larvae of the oak processionary [...] reducing the viability of oak trees. However, this is usually less of a problem as the trees normally recover from this. More important is the health risk

American serpentine leaf miner

enter the plant tissue via the feeding spots. Life cycle and appearance of American serpentine leaf miner The life cycle of a leaf miner has the following [...] roughly one hour the larva crawls out of the leaf and falls to the ground. This occurs in the early morning. The larva crawls into the ground to pupate [...] intermediate forms of tunnelling between these ‘plate mines’ and normal mines, making it an unreliable criterion for the identification of the species. Indirect