• Damping-off

  aphanidermatum mostly occurs in young plants and damage is more extensive in young crops. Damage symptoms Pythium affects roots, in particular those of seedlings [...] subsequently zoospores are produced. Zoospores are spores with flagellae, which enable the spores to move through water. The zoospores are chemically drawn to [...] most rapidly in wet conditions with a high water content ( > 70%) of the soil or substrate. Oospores are dispersed when soil particles are moved around

• Bacterial wilt, brown rot

  wilt and brown rot in a very wide range of potential host plants. Damage symptoms In potato, field symptoms of Ralstonia solanacearum are wilting and yellowing [...] slime produced from wounds, which is not seen in Clavibacter -infected plants. In tomato, the youngest leaves are affected first. They show signs of wilting [...] quarantine organism in Europe and considered a bioterrorist organism in the United States. It is a commonly found soil-inhabitant in tropical and subtropical

• Early blight

  (RH) of over 90% or when the leaves are wet. Small differences in optimum temperature occur between species, but in general the risk of Alternaria infection [...] and propagation materials. Practice crop rotation, in particular when spores surviving in the soil are the main source of infection. Especially wheat and [...] General The only known stage in all Alternaria species is the asexual stage. Conidia and mycelium overwinter in the soil and on crop residues and cause

• Partners with Nature

  April 5, 2016

  operate, this goal remains the same. This clarity of mission crystallized in October in 2014, after almost 50 years of Koppert’s dedication to the production [...] solutions & knowhow and knowledge sharing are the three important pillars of our company. Cornerstones that are inseparably connected and continue to grow [...] Koppert is playing an ever-increasing role in boosting the sustainability of cultivation and the chain. We are convinced that by working with nature and

• Phytophthora blight

  optimal for crop growth. Phytophthora overwinters in roots, infected tubers and bulbs or in the soil in different stages: as oospores (sexual overwintering [...] cells which are resistant to desiccation) or mycelium. Zoospores are formed from the overwintering structures which infect the host. Zoospores are spores with [...] of Phytophthora blight Phytophthora species are very destructive organisms belonging to the Oomycetes and are therefore strictly speaking not fungi. They

• Black sigatoka disease

  produces both ascospores and conidia. The ascospores are wind-dispersed over longer distances, the conidia are splash-dispersed within the crop. Both types of [...] parallel to the veins. Within a few days, the spots become a few centimetres in size and turn brown with light grey centres. These spots enlarge further and [...] and dies. Lesions merge and the whole leaf turns brown and ultimately dies. In cases of severe infection leaves may die within a few weeks. Because of the

• Cottony soft rot

  lesions, giving this disease its name cottony soft rot. In the mycelium, big, dark sclerotia are formed. They can easily be seen with the naked eye and [...] Sclerotinia sclerotiorum ) overwinters as sclerotia and mycelium in dead and living plant material in or on the ground. Sclerotia germinate at temperatures between [...] first symptoms of a cottony soft root ( Sclerotinia sclerotiorum ) infection are water-soaked lesions at the stem base. The plant above it wilts and rots.

• Cotton bollworm

  rapidly, and drop off. In legumes, flowers are attacked, and seed pods may be pierced. Life cycle and appearance of Cotton bollworm Eggs are deposited individually [...] brown. Full grown larvae are 30 to 40 mm long. The first instars are the most mobile, and move like loopers. The caterpillars are often aggressive and c [...] approximately 18 to 19 mm in length and have a wingspan of about 40 mm. The grey-green males are smaller. The forewings are edged with a line of black

• Faba bean

  bean’ is commonly used in the United Kingdom, New Zealand and Australia and usually applied to large-seeded varieties which are cultivated for consumption [...] sturdy stems of a square cross-section. The broad beans are broad, leather like pods. They are green and usually mature to a blackish-brown with a densely [...] food production have pods which are 15-25 cm long and 2-3 cm thick. Each bean pod contains some 3-8 seeds. These seeds are round or more oval shaped.

• Tomato russet mite

  lycopersici was detected for the first time in Australia and is a pest in tomatoes in all areas where they are grown. Other members of the plant family [...] of legs, whereas other mite groups have four pairs. Eggs are roughly 0.05 mm in diameter and are laid on the underside of leaves, on leaf petioles, and on [...] after about two or three days. They are cream to orange-yellow in colour, wedge-shaped and very small (roughly 0.17 mm in length), with males being slightly