• Angular leaf spot

  in combination with high humidity or presence of water. These conditions occur mostly in the spring if it rains or when sprinkler irrigation is used. [...] bacterium is very resistant to desiccation and can survive well in dry leaves or leaves in the soil, but not independantly in the soil. Under humid conditions [...] secondary source of infection. They are dispersed by rain, irrigation water or handling of the plants. Infection of the plants happens both passively and

• Verticillium wilt

  Start with clean soil or substrate by heating it at a temperature if at least 65 o C for a minimum of 30 minutes Use clean seed, tubers or cuttings Grow less [...] the stalk horizontally reveals a slight discolouration of the vessels, brown or greenish, but much less distinct than the discolouration caused by Fusarium [...] symptoms. In many crops, the fungus can be present without clear symptoms or with only partial wilting. Life cycle and appearance of Verticillium wilt

• Fusarium wilt

  mycelium cells) or mycelium. Survival is also possible on seed, greenhouse structures, tools and machinery. Primary infection is either seed-borne or takes place [...] at the root tip or in small wounds, for example where lateral roots branch off from the tap root. How to prevent Fusarium wilt Remove or destroy crop residues [...] crops. Many species are considered weak pathogens and can only infect wounded or stressed host plants. Damage symptoms Fusarium fungi cause vascular wilt,

• Southern blight

  occur during germination or establishment of the plant (seedling phase), due to the occurrence of fungi inhabiting the soil, or associated with the seeds [...] asexual and there are no spores, forming dark brown or black sclerotia which are rounded, irregular, or compact. The sclerotia have a resistance structure [...] General Grey rot or southern blight is a disease caused by the fungus Athelia (Sclerotium) rolfsii . It is an important plant pathogen that inhabits the

• Pea blight, leaf and pod spot

  and infect through the stomata or directly through the cuticle. On the lesions, pycnidia are formed from which orange-red masses of two-celled conidia are [...] a fungal plant pathogen that causes A scochyta blight on pea (leaf blight or pea blight) and lesions of stems, leaves, and pods (pea leaf spot and pea [...] elongated. The lesions are light brown, sunken and surrounded by a dark brown to red-brown border. The first infection is often on the primary leaves. The fungus

• Pierce's disease of grapevine

  green leaf suddenly dies and turns brown with adjacent tissue turning yellow or red. This desiccation spreads and the whole leaf may shrivel and drop off. Infected [...] In plums, the first symptoms are irregular chlorosis or browning of leaves along the margin or the tip from early to midsummer. The necrotic area spreads [...] treatment of dormant cuttings (20 minutes at 50 °C or 180 minutes at 45 °C) Prune diseased branches or whole trees to remove inoculum sources Prevent plant

• Powdery mildew

  most crops, the white colonies later turn brown or grey. Severely affected leaves may turn yellow, curl up or drop off. Life cycle and appearance of Powdery [...] than a few hours. Powdery mildew spores, either ascospores or conidia, don’t need nutrients or water for germination. In general, the development rate of [...] barely survive in the absence of a living crop. They survive as ascospores or perithecia, structures containing ascospores. Ascospores have not been found

• Gummy stem blight

  fruits. The symptoms on stems, leaves and inside the fruits may occur together or individually. Life cycle and appearance of Gummy stem blight Mycosphaerella [...] can be infected directly, through wounds, hydathodes (the end of leaf veins) or the hair bases. Stems are infected through wounds and by the infected leaves [...] crop prevent condensation on all plant parts at all times Extra Silicon and/or Calcium nutrition hardens the cell walls and makes it harder for the fungi

• Wheat bunt

  remain green longer than healthy heads. The glumes are opened either on some or on all spikelets, showing the bunt (smut spore) they contain, which is larger [...] bunt Tilletia tritici and Tilletia laevis survive as teliospores in the soil or on seed. These teliospores germinate in response to moisture and form bas [...] type so that H-shaped structures are formed. These can germinate directly or form secondary sporidia. These sporidia infect the wheat seedlings even before

• Dwarf bunt

  a fungus known to cause the smut disease TCK smut in soft white and hard red winter wheats, as well as dwarf bunt. Damage symptoms Tilletia controversa [...] remain green longer than healthy heads. The glumes are opened either on some or on all spikelets, showing the bunt (smut spore) they contain, which is larger [...] appearance of Dwarf bunt Tilletia controversa survives as teliospores in the soil or on seed. The soil-borne teliospores are the main source of primary infection