Leek

identify various species of leek, but now they are all classified as cultivars of Allium ampeloprasum . The part of the plant that can be eaten is at times [...] ‘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 soil. [...] About The vegetable leek is a cultivar of Allium ampeloprasum , the broadleaf wild leek. In the past, many different scientific names were used to identify

Experience Centre

from 9:00 AM to 5:00 PM. A tour takes an average of 1,5 hours and is suitable for groups of up to 15 visitors. In the case of bigger groups, the programme [...] you know that the vision of bumblebees differs vastly to that of humans and that we use that difference to provide our clients with the most effective [...] pollination , come and visit the Koppert Experience Centre where you can take an interactive journey through the fascinating world of sustainable cultivation

Tobacco whitefly

is the result of sucking out the sap from the plant leaves and secreting honeydew. This can have the following consequences: If the population is very large [...] influence the development of fruit and lead to a reduction in yield. The honeydew deposited on fruit makes it sticky. Dirt adheres to the fruit, and the growth [...] peppers, yellowing of the flower stalks in gerbera, and serious yellowing of the leaves of French beans. Other symptoms include the appearance of chlorotic patches

Diamond back moth

antennae. The hindwings are narrow, pointed toward the apex. The tips of the wings appear to turn upward slightly when viewed from the side. In males, the upper [...] may occur in the florets. Initially, the pupa is pinkish-white to pinkish-yellow and changes to brown before adult emergence. The adult of the diamond back [...] upper edge. In females, the upper two-thirds of the forewings are light ochreous and the markings are like those of the males. The back is marked with a

Aphidius matricariae

stripes on side parts of the wasp waist. Aphidius matricariae is specific to aphids of the family Aphididae. Most species belong to the genera Myzus, Aphis [...] density and should always be adjusted to the particular situation. Start introduction preventively soon after planting of the crop. Introduction rates typically [...] appearance of Aphidius matricariae Adults are 3-4 mm golden brown wasps with long antennae. Characteristic for the distinction of the species are the fine stripes

Fusarium spp.

inside the vascular system of the host plant and spreads upwards inside the plants. The other species are dispersed upwards on the outside of the plant. Most [...] ) is the species that causes vascular wilt. Initially, the leaves turn yellow and wilt, mostly on one side of the plant. Finally, the whole plant wilts [...] towards the foot of the plant and enters the vascular system. Inside the vessels, the fungus produces mycelium and many spores (microconidia), which are

Broad mite

similar 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 [...] concentrated on the underside near the leaf stalk, which tends to cause the leaf to turn brown and curl up. A typical indication of an attack of broad mite [...] lay their eggs mainly on the underside of the leaf or on the fruit surface. The elongated, oval eggs are firmly attached to the surface and are rather large

Asparagus

species that belongs to the genus Asparagus . In the past, the asparagus plant was classified as a lily species, like the related Allium species of onion and [...] Nowadays the onion-like plants belong to the Amaryllidaceae and asparagus are classified as Asparagaceae . Asparagus officinales is an indigenous plant in most [...] as ‘green asparagus’ and ‘white asparagus’. To produce white asparagus, the shoots are not exposed to the sun (they are covered with soil) and without

Conifer

are also referred to as Pinophyta, Coniferophyta or Coniferae . The plants are so-called gymnosperms or seed-bearing vascular plants. This means that their [...] ovary. All existing conifers are perennial, woody plants and secondary growth occurs in the development of conifers. Conifers are usually trees, but few varieties

Fusarium wilt

inside the vessel system of the host plant and spreads upwards inside the plants. The other species are dispersed upwards on the outside of the plant. Most [...] oxysporum is the species causing vascular wilt. First the leaves turn yellow and wilt, mostly on one side of the plant. Finally, the whole plant wilts. Other [...] place as infection of the roots at the root tip or in small wounds, for example where lateral roots branch off from the tap root. How to prevent Fusarium