• Glasshouse potato aphid

  January 1, 1970

  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 [...] laid) and holocyclic (winter eggs are produced) lifecycles. There is no alternation of hosts, and the two types of life cycles occur on the same host plant [...] their presence in the crop. The wingless adult stage of the greenhouse potato aphid is rather squat, of medium size (1.8 - 3.0 mm long) and oval in shape.

• Bacterial canker of tomato

  January 1, 1970

  then growing into the vessels of the plant. Plant growth is inhibited and the plant wilts because the xylem vessels become blocked. The bacterium can survive [...] centre. In potato, the disease usually only occurs in the second half of the season. The first symptoms are wilting of the lower leaves and subsequent expansion [...] stems, leaves and fruits. Leaves and shoots wilt. On the lower leaves, blister-like white lesions occur, which later turn brown and may merge. The leaves wilt

• Cotton aphid

  January 1, 1970

  virus. 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 [...] contaminating fruit and ornamental crops and rendering them unsuitable for market. At the same time, photosynthesis in the leaves is reduced, affecting [...] melon, pepper and many ornamental plants such as chrysanthemum and kalanchoe. The cotton aphid ( Aphis gossypii ) is distributed throughout the world but prefers

• Beetles

  January 1, 1970

  before reaching the adult stage. Larvae have biting mouthparts and mostly feed on the same food as the adults. The pupae do not make a cocoon and will already [...] contribute to the control of aphids . Beetles undergo a complete metamorphosis, that is, the larvae do not resemble the adult at all, and must pass through [...] 350,000 known species, Coleoptera is the largest of all insect orders and displays an enormous variety of form, size and habit. A number of species are a

• Potato aphid

  January 1, 1970

  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 [...] contaminating fruit and ornamental crops and rendering them unsuitable for market. At the same time, photosynthesis in the leaves is reduced, affecting [...] General The potato aphid ( Macrosiphum euphorbiae ) is of North American origin, but is these days distributed throughout the world. It is a highly polyphagous

• Green peach aphid

  January 1, 1970

  different viruses and is thus rightfully feared by many growers. Nymphs and adults extract nutrients from the plant and disturb the balance of growth hormones [...] contaminating fruit and ornamental crops and rendering them unsuitable for market. At the same time, photosynthesis in the leaves is reduced, affecting [...] As a result, the plant’s growth is retarded giving rise to deformed leaves or, if the infestation occurs early enough in the season, the death of young

• Wheat

  January 1, 1970

  specifically the Levant region that lies east of the Mediterranean. The wheat plant is an annual plant which is sown either in spring or autumn. The plant flowers [...] flowers from about the end of May to the beginning of June. This flowering period is rather long (usually lasting longer than a week), because not all flowers [...] flowers of one single plant open at the same time.

• Aphidius ervi

  January 1, 1970

  is available in a bottle ( Ervipar ). Spread the material on rock wool slabs or in Diboxes Make sure the material remains dry and is not moved from its [...] use of Aphidius ervi The parasitic wasp Aphidius ervi is most effective between 20 and 25°C (68 and 77°F). This natural enemy is not effective at temperatures [...] nectar and water to sustain themselves. Life cycle and appearance of Aphidius ervi Aphidius ervi is a very dark aphid parasitoid. The waist is entirely

• Beet armyworm

  January 1, 1970

  even black. The colour and pattern of the caterpillars is highly variable and depends partly on the host plant, the stage of development and the climate. [...] during the day and is active only at night. The forewings are grey-brown suffused with a dark brown or black. The head and thorax are brown and the abdomen [...] roses and potted plants. In both the greenhouse and the field, it is a major pest of sweet pepper. Damage symptoms Older caterpillars migrate to the top

• Amblyseius swirskii

  January 1, 1970

  often in the axil of veins. They are oval, white and are approximately 0.14 mm in diameter. The larvae have six legs, are the same colour as the eggs, and [...] tomato, use of Amblyseius swirskii is not recommended as it is hindered by the glandular hairs on the stems and leaves and does not build up a population. [...] agent of thrips and whiteflies. Amblyseius swirskii can also survive on pollen and other prey and can establish in the crop before the pest appears. These