Downy mildew of Cucurbits

stomata. Life cycle and appearance of Downy mildew Pathogens causing downy mildew are not fungi but Oomycetes and related to Pythium and Phytophthora. They [...] during propagation and maintaining a warm and dry climate in greenhouses. Use hygiene measures. Start clean, remove crop residues and prevent splashing [...] pumpkin, watermelon and squash. Damage symptoms Downy mildew pathogens infect mostly the leaves but occasionally also stems and fruits. They cause lesions

Bacterial wilt, brown rot

well in water and in many different soil types and on alternative hosts like weeds. It invades the plants through wounds or stomata and then spreads into [...] pathogenic bacterium. It is a soil-borne disease and colonises the xylem, causing bacterial wilt and brown rot in a very wide range of potential host plants [...] potato, field symptoms of Ralstonia solanacearum are wilting and yellowing of leaves and stunted plants. Inside, vascular browning is common with bacterial

Black rot of carrots

Alternaria species is the asexual stage. Conidia and mycelium overwinter in the soil and on crop residues and cause primary infection of the leaves. Survival [...] within five days. Infection is both direct and through wounds and stomata. Spores are dispersed by wind and in some species through the splash of rain [...] Typically, Alternaria causes spots on leaves, petals and stems. These spots can be distinguished by the dark and brown concentric rings that are caused by sporulation

Crazy roots, hairy roots, crown gall

which are first white and later turn brown. Only Rhizobium radiobacter causes galls and tumours on underground plant parts and on the crown. Furthermore [...] break open, releasing many bacteria. These are dispersed by rain and wind and by humans and tools. Until now, no bacteria have been isolated from crazy roots [...] roots, hairy roots and crown gall. Damage symptoms The four pathogenic Rhizobium species cause different symptoms, like galls, tumours and excessive root growth

Bacterial canker of tomato

on stems, leaves and fruits. Leaves and shoots wilt. On the lower leaves, blister-like white lesions occur, which later turn brown and may merge. The leaves [...] the name ring rot. Life cycle and appearance of Bacterial canker of tomato Clavibacter is seed-borne and tuber-borne and primary infection is mostly from [...] protective clothing and gloves, disinfect tools and greenhouse structures Use a crop rotation in field crops of at least two years and alternate with a non-host

Damping-off

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 the plant turns brown [...] finger nail. Life cycle and appearance of Damping-off Pythium belongs to the Oomycetes, a separate group of microorganisms and is therefore not a real [...] immediately after planting. Avoid cold and excessive warm irrigation water. Keep the water content of the substrate below 70% and ensure good drainage Disinfect

Powdery mildew

apple, pear, outdoor grown rose and other Rosaceae , the fungus causing powdery mildew is extremely sensitive to water and ‘hides’ on the underside of the [...] mildew fungi and especially in greenhouse crops they don’t play a role in the epidemics. Fungal spores germinate on the leaf surface and the germ tubes [...] tubes grow and branch out on the leaf surface. Small structures are produced, the haustoria, from which the fungus penetrates the plant cell and takes up nutrients

Phytophthora blight

es between 15 and 23 °C and higher water content than is optimal for crop growth. Phytophthora overwinters in roots, infected tubers and bulbs or in the [...] growing root tips promote germination and attract the zoospores. The pathogen grows into the stem and on the plant surface and new sporangiophores (structures [...] ting and be careful with overhead irrigation since both a high water content of the soil and water splash promote disease. Ensure fast drying and wound

Horiver Disc

root aphids and fungus gnats. Pests Root aphids , fungus gnats . Mode of action Insect pests are attracted to the colour of the sticky trap and get caught [...] Presentation Polysterene disc coated with dry sticky glue. Available colours and sizes Yellow: 18 cm diameter Numbers per package 50 pieces Downloads SDS Horiver [...] the top side of the trap Replace the traps when largely covered by insects and/or debris Dosage One Horiver Disc per plant. Storage temperature 0-32°C/32-104°F

Pollination products

Pollination products