Green peach aphid

least 100 different viruses and is thus rightfully feared by many growers. Nymphs and adults extract nutrients from the plant and disturb the balance of growth [...] making the crop and its fruit sticky. Black fungal moulds ( Cladosporium spp.) grow on this honeydew, contaminating fruit and ornamental crops and rendering [...] tips. Life cycle and appearance of green peach aphid Aphids have a complex life cycle, with both winged and wingless forms of adults and a great variety

Leaf stripe

stripes are 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 [...] may be stunted and heads may be distorted and failing to emerge from the sheath. Ear length and the number of kernels may be reduced and kernels may be [...] disease of Barley that causes significant yield losses. Damage symptoms Symptoms first occur on the first, second and third leaf and subsequently on other

Tomato

is the edible fruit of this plant. The plant is native to Central and South America and the tropical highlands. Tomato plants usually grow to a height of [...] temperate climates around the world. Greenhouses make year round production and cultivation in cooler regions feasible.

Brown root rot, corky root rot

e disease causes more and more destruction of the root system and subsequent loss of vigour and further wilting. Life cycle and appearance of Brown root [...] soil and in buried tomato roots as microsclerotia. The microsclerotia germinate and produce mycelium that in turn infect the roots of tomato and other [...] lycopersici is a fungal plant pathogen, infecting tomatoes and aubergine. It causes brown root rot and corky root rot. Damage symptoms The first signs of this

Grower Koen - Embracing biological crop protection in agriculture

increasingly critical. Society expects more and more that agriculture is environmentally friendly and responsible. And that the vegetables consumers eat are safe [...] of agriculture, where traditional and organic practices complement each other, and how organic and traditional farming are getting closer together. "The [...] traditional and organic is actually quite pleasant," he explains. He emphasizes that his approach stemmed from both practical considerations and a conscious

Early blight

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 [...] potato and early blight of tomato, which presents itself as spots on leaves, petals and stems. These spots can be distinguished by the dark and brown [...] 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

Pierce's disease of grapevine

normal and look stunted. Twigs and branches die and the foliage becomes thinner, but the trees don’t die of the disease. Olives: Scorch symptoms and desiccation [...] killed and the trees die. Life cycle and appearance of Pierce's disease of grapevine The bacteria live in xylem vessels in roots, stems and leaves and multiply [...] symptoms. More and more plant species are discovered as hosts. Xylella fastidiosa is best known in grapevine, stone fruit (peach and plum) and citrus, where

Ornamentals

Black root rot of cucurbits

are slightly sunken and are mostly formed around the point of attachment of lateral roots and root hairs. The lesions may grow and encircle the root. The [...] rot of cucurbits. Life cycle and appearance of Black root rot of cucurbits Phomopsis sclerotioides survives in the soil and is a strong saprophytic competitor [...] colonize ‘clean’ or sterilized soil and substrate. It aggregates, so disinfection needs to be applied thoroughly and evenly. Phomopsis sclerotioides forms

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 [...] causes spots on leaves, petals and stems. These spots can be distinguished by the dark and brown concentric rings that are caused by sporulation. Species [...] 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