• May beetle

  although this is not a method which works for all species. They can best be identified based on examination of the male genitalia. They have a very long lifecycle [...] the larvae are fully grown a kind of earthern cell is created in the ground in which they pupate. The adult beetles emerge a few weeks later but remain [...] species from the Melolonthinae subfamily. Although this subfamily contains a number of species which cause damage to crops, the most representative genus

• Entonem keeps young orchids free from fungus gnats

  young plants in a fine mist. This is followed by a second fine mist to rinse off nematodes that are on the leaves. A while later, I collect a few drops of [...] operate a zero-tolerance policy. To make it possible for them to start with a clean plant, we maximize our use of biological plant protection, with a strong [...] compatible with a Dosatron. But since Koppert changed the formulation, it works perfectly.’ It is important to apply it correctly, he says. ‘It’s a careful balancing

• Circular scale

  hatch under the scale and the crawlers walk about to find a suitable feeding site before settling to a sessile lifestyle. The second-instar nymphs are the main [...] General The circular scale, Chrysomphalus aonidum is a tropical species, native to the Oriental region but it has been dispersed widely in tropical and [...] it occurs on many other plants. Damage symptoms Chrysomphalus aonidum has a preference for humid environments. In citrus, it tends to prefer the lower

• Broccoli

  looks a bit like a tree and branches out from a single thick, edible stalk. Broccoli (both the head and the stalk) can be cooked and eaten as a vegetable [...] oleracea. Broccoli looks a lot like cauliflower, which belongs to a different cultivar group of the same species. The plant has a large, flowering head that [...] About Broccoli is a tasty, green plant. When it comes to botanical classification, the broccoli plant is categorized as part of the Italica cultivar group

• Thrips

  larval instars, a pre-pupa and a pupal instar, and finally the adult insect. The eggs are kidney-shaped and have a white or yellow shell. Before a female deposits [...] in length. They have a distinctive elongated shape, with long, narrow wings that are fringed with fine hairs. Color: Thrips can be a variety of colors, depending [...] populations in check. Predatory mites in sachets can be a good preventive measure as the sachets enable a continuous supply of predatory mites even before the

• Carnation tortrix

  other greenhouse materials. At first, the eggs are a light green colour, later becoming yellow. They have a flattened oval to round shape. Caterpillars have [...] General The carnation tortrix ( Cacoecimorpha pronubana ) is a Mediterranean species belonging to the family of Tortricidae . It occurs in the Middle East [...] at the third larval instar, the whole leaf is attacked and surrounded by a dense silken mass. The larvae hide inside the rolled leaves, growing tips or

• Pepper weevil

  larva forms a cavity and covers it with its excrement, creating a type of cell, to be used later when it begins its metamorphosis. It develops a shiny white [...] since they throw themselves to the ground and keep still when they detect a threat. Damage symptoms The most significant damage occurs with the loss of [...] damaged. Lifecycle and appearance of the pepper weevil Newly hatched adults have a light brown colour, with an oval body measuring 2 to 3.5 mm in length, and

• Tobacco whitefly

  symptoms The larvae of whitefly need a lot of protein for growth, and thus consume a large quantity of plant sap. This contains a high proportion of sugar, and [...] and subtropical countries of the world. The original habitat was probably a tropical or subtropical area, possibly Pakistan. The tobacco whitefly ( Bemisia [...] stadia remain flattened on the leaf. The fourth larva stadium develops into a yellow, almost circular so called pupa, in which the red eyes and white wings

• Tomato russet mite

  Australia and is a pest in tomatoes in all areas where they are grown. Other members of the plant family Solanaceae may be affected to a lesser extent. Damage [...] The first nymphal stage is a transparent white colour and about 0.1 mm long. They usually develop to the 2nd stage within a day. All life stages look very [...] the contents of plant cells. Affected leaves are slightly curled and acquire a silvery sheen on the underside. Later they become brown and brittle. Badly

• Cotton aphid

  world but prefers the warmer regions. It has been a pest in European greenhouses since the late 1980’s, particularly affecting cucumber. Damage symptoms [...] nutrients 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 [...] appearance of Cotton aphid Aphids have a complex life cycle, with both winged and wingless forms of adults and a great variety in colour. In greenhouses