• Whitefly

  January 1, 1970

  engaged for several hours in seeking a suitable place on the leaf where they can feed. Once they have found such a spot, they remain there throughout the [...] the leaf: the longer the hairs on the leaf, the longer the hairs on the insect. In other words, the larva adapts itself to the structure of the leaf on [...] feeding weakens plants, causes leaf yellowing and leads to honeydew deposits that reduce crop quality. Effective whitefly control is essential to maintain healthy

• Anthurium

  January 1, 1970

  anthurium is a flowering, perennial plant and has beautiful, long lasting flowers that come in a variety of colours. However, the ‘flower’ is actually an [...] markets, red is the most popular colour. Other types include the obake anthuriums which are larger than the standard ones and their spathe has a more prolonged [...] an altered leaf (also called spathe) with many flowers on the spadix. Standard varieties of anthuriums are recognized by its uniform colours and heart-shaped

• Dwarf bunt

  January 1, 1970

  General Tilletia controversa is a plant pathogen. It is a fungus known to cause the smut disease TCK smut in soft white and hard red winter wheats, as [...] on all spikelets, showing the bunt (smut spore) they contain, which is larger than a normal kernel. The bunt balls are grey-brown. They rupture at harvest [...] healthy kernels, which in turn become a source of disease in the next season. The optimum temperature for germination is 3-8 °C and it takes three to ten weeks

• Hemp russet mite

  January 1, 1970

  Aculops cannabicola is host specific to hemp/cannabis ( Cannabis sativa ). It cannot survive on other plants. Damage symptoms Damage is caused by the mites [...] on the underside of leaves. This results in smaller leaf size and suppressed bud growth leading to a reduction in the number of buds and dwarfed buds. This [...] of damage include dull, greyish, or bronzed leaves and upward curling of leaf edges. Life cycle and appearance of Hemp russet mite All life stages of the

• Tomato russet mite

  January 1, 1970

  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 [...] 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 [...] Damage symptoms Damage is caused by the mites sucking out the contents of plant cells. Affected leaves are slightly curled and acquire a silvery sheen on the

• Box tree moth

  January 1, 1970

  brown with a dark pattern towards the end of pupation. There are two variants of adults. The most common one is mostly iridescent white with a dark brown [...] brown band at the outer margin and a characteristic white spot on the forewing, while the other is mostly light brown with a white spot on the forewings. The [...] death of the tree. As the tree is extensively traded within Europe, the box tree moth ( Cydalima perspectalis ) poses a serious threat as invasive species

• False spider mites

  January 1, 1970

  dorsal surface showing a net-like pattern. The eggs are a clear red colour and elliptical in shape. They are laid in a fold in the leaf or along the mid-vein [...] underside of leaves where they cause a brown, scabby discolouration spreading from both sides of the main vein into the leaf blade. The damage often leads to [...] can become misshapen, presumably because the mites secrete a substance while feeding, that is poisonous to the plant. In places where mites have been feeding

• Leek

  January 1, 1970

  plant that can be eaten is at times erroneously called a stem or stalk. This part is actually a bundle of leaf sheaths. This bundle is blanched by putting [...] ‘trenching’). The plant is usually sold as a small seedling and planted in a greenhouse. Later on, as weather permits, the leek is planted outside in the [...] Once outside, the plant is rather hardy and many varieties can be left in the soil during winter and harvested when there is a need for them.

• Greenhouse whitefly

  January 1, 1970

  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 the excess is excreted [...] remain flattened on the leaf. The fourth larva stadium develops into a white, oval case encircled by a ring of erect waxy rods. This is called the pupa stadium [...] es: If the population is very large, feeding on plant sap can affect the physiology of the plant, as a result of which growth is retarded. In full sunlight

• Tree specialist Wolterinck: Control of oak processionary caterpillar with Entonem

  January 1, 1970

  least 30% of their leaf cover, Bacillus thuringiensis can also have a good combatting effect.’ Staunch advocate Wolterinck BV is a staunch advocate of [...] Wolterinck BV in Beltrum, the Netherlands, is a specialist in tree care and weed control and works on behalf of local authorities and governmental bodies [...] The product is our preferred method over products based on Bacillus thuringiensis , which can only be used on trees with leaves. Nematodes are a better solution