Crazy roots, hairy roots, crown gall

Furthermore, infection is characterized by excessive root growth (crazy roots). In greenhouse vegetables, the roots overgrow the substrate and in severe epidemics [...] Rhizobium. Rhizobium rhizogenes or Rhizobium radiobacter causes crazy roots, hairy roots and crown gall. Damage symptoms The four pathogenic Rhizobium species [...] excessive vegetative growth occurs. Life cycle and appearance of Crazy roots, hairy roots, crown gall The primary source of infection by Rhizobium rhizogenes

Brown root rot, corky root rot

at the roots, there are three different symptoms. Small feeder roots rot completely. Small roots may show smooth brown lesions. On older roots, the outer [...] destruction of the root system and subsequent loss of vigour and further wilting. Life cycle and appearance of Brown root rot, corky root rot Pyrenochaeta [...] plant pathogen, infecting tomatoes and aubergine. It causes brown root rot and corky root rot. Damage symptoms The first signs of this disease, are poorly

Root rot of carrot

that extend only to 2 mm in the root, up to 20-25 per carrot root. They occur haphazardly. The fungus sporulates on root, leaf, and petiole lesions. Continuous [...] diseases. When carrots are stored during winter, diseases on the carrot roots can continue to develop during storage. Alternaria radicina , Alternaria [...] Rhexocercosporidium carotae is a slow-growing fungus that can infect both roots and foliage. The infection starts with small black spots over the entire

Black root rot of cucurbits

line on cucumber roots. The lesions are slightly sunken and are mostly formed around the point of attachment of lateral roots and root hairs. The lesions [...] sclerotioides) Black root rot of cucurbits General Phomopsis sclerotioides is a plant pathogen infecting cucurbits, causing black root rot of cucurbits. Life [...] lesions may grow and encircle the root. The roots become yellow-brown to black and ultimately die. Black lesions with fruiting bodies occur more commonly at

Root and crown rot of strawberry

or brown necrotic areas in crown and root of strawberry. Plant development is slow, growth is retarded and rooting is poor. Transplants look weak and may [...] strawberry have been ascribed to Pestalotiopsis clavispora in the case of root and crown rot (of strawberry), first found in The Netherlands, and Pestalotiopsis [...] psis clavispora and Phytophthora cactorum . Life cycle and appearance of Root and crown rot of strawberry Not much is known about the life cycle. The fungus

Blight of pepper

Phytophthora causes root rot, seedling damping off and rot of stems, bulbs, tubers, leaves and fruits. Several Phytophthora species cause root- and crown rot [...] rot in potted plants. The small roots die and brown-black lesions occur on the larger roots. Plants wilt and the crown leaves drop off. Life cycle and appearance [...] Infection is usually from the root to the foot, but direct infection of the foot also occurs. Exudates leaking from growing root tips promote germination and

Pomegranate wilt complex

colouration of wood below bark and vascular discoloured bands in the stem and roots. Disease cycle The fungus survives for more than 7 years in infected plant [...] plant debris and soil. The pathogen spreads through planting material, root grafts, soil, irrigation, rain, flood, insects, farm machinery and intercultural [...] per litre of water and drench 20 to 25 litre of solution per tree to the root zone by making the ring around the tree for three times at weekly intervals

Black leg of seedlings

the growing roots of young plants and move towards them through the soil water. They infect the roots through small wounds, where the side roots are formed [...] ly. In potted plants the flower buds fall off. The side roots rot and very little of the root system survives. On the border between air and soil or substrate [...] and causes among others cereal diseases. Damage symptoms Pythium affects roots, in particular those of seedlings. Infected plants lag in growth. Seedlings

Apple collar rot

a cactorum causes seedling damping off, a reduced root system and black discolouration of the roots. On the foot, dark brown lesions with sharp borders [...] Infection is usually from the root to the foot, but direct infection of the foot also occurs. Exudates leaking from growing root tips promote germination and [...] General Phytophthora cactorum is a plant pathogen that causes root rot, rhizome rot of strawberry, apple rot, apple collar rot and crown rot. It has an

Damping-off

the growing roots of young plants and move towards them through the soil water. They infect the roots through small wounds, where the side roots are formed [...] ly. In potted plants the flower buds fall off. The side roots rot and very little of the root system survives. On the border between air and soil or substrate [...] damage is more extensive in young crops. Damage symptoms Pythium affects roots, in particular those of seedlings. Infected plants lag in growth. Seedlings