• General Conditions Koppert

  January 1, 1970

  complaints from the Buyer concerning the quality and/or quantity of the delivered Natural Enemies, Pollinators and/or Products and/ or Services and/or Advice; [...] 1 The Buyer must be aware that the trading in and the application of the Natural Enemies and Pollinators require a high level of monitoring and expertise [...] damage which is the immediate and direct K result of defects in the Natural Enemies, Pollinators, and Products delivered. Specifically, the obligation to

• Fall Armyworm

  January 1, 1970

  different parts of the host plant, depending on the crop, the stage of crop development, and the age of the larvae. On maize, young larvae usually feed [...] inverted Y-shaped mark on the front of the head and four large spots on the upper surface of the last segment. Pupae are reddish brown and measure 13 to 17 mm [...] General The fall armyworm is a polyphagous pest that is indigenous throughout the Americas. Recently, it has been found in Africa too. The caterpillars

• Predatory mites

  January 1, 1970

  Scouting is essential to know where the pest is, how severe the infestation is and to identify the pest. Select the right predatory mite: Choose the appropriate [...] chemical pesticides. Koppert is the pioneer in the development of predatory mite solutions, starting in 1967 with the rearing of the predatory mite Phytoseiulus [...] combination of predatory mites, food, and carrier materials. The mites breed within the sachets and subsequently disperse into the crop. These release sachets are

• Root rot of carrot

  January 1, 1970

  various shapes. The lesions can merge and eventually cover the entire surface of the carrot. The affected areas are firm, shallow, and clearly visible [...] of the leaf will die off. The fungus appears to prefer older tissue. In the field, the disease is difficult to distinguish from both Cercospora and Alternaria [...] morphological features hence is not easy to place it at the generic level. Årsvoll was the first to identify and describe the fungus in Norway, in 1965.

• Bacterial wilt, brown rot

  January 1, 1970

  s roots on the stem. The vascular stem tissue is coloured brown and when the stem is cut, bacterial slime oozes from the wound. This is the way to distinguish [...] st organism in the United States. It is a commonly found soil-inhabitant in tropical and subtropical regions and is transferred by the introduction of [...] Ralstonia solanacearum is a plant pathogenic bacterium. It is a soil-borne disease and colonises the xylem, causing bacterial wilt and brown rot in a very

• Downy mildew of Cucurbits

  January 1, 1970

  downy mildews, the optimum temperature is around 15 o C and the closer the temperature is to this, the shorter the leaf wetness period that is required. Inside [...] yellow and then turn brown. On the underside of the leave fluffy growth appears which is first white and later turns grey-brown. This is actually the sporulation [...] directly and the germ tubes infect the plants either through the stomata or directly by penetrating the cuticula. For germination free water is required

• Leaf stripe

  January 1, 1970

  formed at the base of the leaf and the leaf sheath. They gradually extend and become brown and chlorotic and may merge. Eventually this leads to the death [...] fungus is seed-borne and this systemic infection is the only source of primary infection. The fungus spreads from the seed into the seedling. Conidia are produced [...] be distorted and failing to emerge from the sheath. Ear length and the number of kernels may be reduced and kernels may be brown. The symptoms do not always

• Southern blight

  January 1, 1970

  lesions on the stem. As the damage progresses, it causes darkening and rotting of the stem, resulting in the destruction of the cortex and the main root [...] southern blight is a disease caused by the fungus Athelia (Sclerotium) rolfsii . It is an important plant pathogen that inhabits the soil, and is responsible [...] leaves, and death of the plant. Symptoms begin with brown, aqueous lesions on the stem. As the damage progresses, it causes darkening and rotting of the stem

• Powdery mildew

  January 1, 1970

  pepper, the fluffy colonies occur mostly on the underside of the leaf, because the fungus infects the plant by entering through the stomata and there are [...] Leveillula taurica ) is through the stomata and the fungus grows inside the leaf. Later, the conidiophores in this case also protrude from the stomata. Conidia [...] outdoor grown rose and other Rosaceae , the fungus causing powdery mildew is extremely sensitive to water and ‘hides’ on the underside of the leaves. Therefore

• Fusarium wilt

  January 1, 1970

  may occur and cause different symptoms. Fusarium oxysporum is the only Fusarium that actually grows inside the vessel system of the host plant and spreads [...] blight in cereals and post-harvest decay. Fusarium oxysporum is the species causing vascular wilt. First the leaves turn yellow and wilt, mostly on one [...] one side of the plant. Finally, the whole plant wilts. Other symptoms are brown discolouration of the xylem vessels which can be seen when the stems are