• Rice root aphid

  feeds on the roots of the host plant. The winged form is about 1.8 mm long, darker than the wingless form, with a brown-black head. Aphids in the winged [...] symptoms Because they suck the plant’s vital sap from the roots, plants infested with rice root aphids will exhibit some or all of the following symptoms: Wilting; [...] deposited on the plant by aphids promotes the growth of mould and fungus. Transmission of viral disease between plants. Life cycle and appearance of the Rice root

• Gerbera

  About The gerbera belongs to the family of daisies or Asteraceae . The flowering plant is originally from South Africa and grew among others in the Cape [...] result of crossing the Gerbera jamesonii with another species from South Africa, the Gerbera viridifolia. The result is generally known as Gerbera hybrida [...] Nowadays, the gerbera is still popular and extensively used as a decorative garden plant or sold as cut flower. Domesticated cultivars are usually the result

• Root rot of carrot

  at the generic level. Årsvoll was the first to identify and describe the fungus in Norway, in 1965. An infection can occur through the soil and the air [...] to black lesions of various shapes. The lesions can merge and eventually cover the entire surface of the carrot. The affected areas are firm, shallow, and [...] develop on the surface. Initially, the disease forms circular to irregular spots on the leaves that vary in colour from grey to almost black. The spots appear

• Fusarium wilt

  oxysporum is the only Fusarium that actually grows inside the vessel system of the host plant and spreads upwards inside the plants. The other species [...] Fusarium 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 [...] tion of the xylem vessels which can be seen when the stems are cut. In banana, whole plantations may die and the soil may not be suitable for planting

• Grey mould

  es unfavourable for germination, the spores can survive a few days on the plant surface and still germinate when the RH increases, for example when cut [...] cinerea ) is part of the foot rot complex, which causes rotting of the foot and may cause death of the plants. In cucumber and tomato the fungus causes lesions [...] lesions on pruning wounds. These lesions may encircle the stem, so the part of the plant above the lesion wilts and dies. In vegetables and strawberry, grey

• Bacterial wilt, brown rot

  signs of wilting during the day which may disappear in the early stages of infection. Under conditions favourable for the bacteria, the whole plant will wilt [...] 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 [...] Control root rot nematodes as the wounds they make on roots help the bacteria to infect the crop Do not use cut potatoes for propagation, since cutting tubers

• Phytophthora blight

  fungal growth on the leaves. The centre is grey-brown with a light-green edge. On the stem, elongated brown lesions occur, usually circling the stem. On potato [...] from the root to the foot, but direct infection of the foot also occurs. Exudates leaking from growing root tips promote germination and attract the zoospores [...] wind and rain causes the pathogen to be returned to the soil from infected plants. Dispersal in the soil happens via water, since the zoospores can readily

• Fusarium spp.

  This species is the only Fusarium that actually grows inside the vascular system of the host plant and spreads upwards inside the plants. The other species [...] infection of the roots at the root tip, or in small wounds, for example where lateral roots branch off the tap root. F. oxysporum grows inside the roots towards [...] towards the foot of the plant and enters the vascular system. Inside the vessels, the fungus produces mycelium and many spores (microconidia), which are

• Black leg of seedlings

  older plants, the leaves lose their turgor or the leaf tips turn yellow, for example in flower bulbs. At first, the plants recover during the night, but later [...] later the plants wilt irreversibly. In potted plants the flower buds fall off. The side roots rot and very little of the root system survives. On the border [...] and soil or substrate the plant turns brown. A typical symptom of a Pythium infection is the easy stripping of the skin from the root cortex with a finger

• Damping-off

  bulbs. At first, the plants recover during the night, but later the plants wilt irreversibly. In potted plants the flower buds fall off. The side roots rot [...] ‘damping-off’, hence the name damping-off disease. In slightly older plants, the leaves lose their turgor or the leaf tips turn yellow, for example in flower [...] of the root system survives. On the border between air and soil or substrate the plant turns brown. A typical symptom of a Pythium infection is the easy