Phytophthora blight

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 [...] infection is either by germinating sporangia or by zoospores produced in the sporangia. For germination on above-ground plant parts, leaf wetness is required [...] General Late blight (Phytophthora infestans f.sp. infestans) is also known as Phytophthora blight, tomato blight, early / late blight tomato, potato blight

Aphelinus abdominalis

wasp is available in a bottle ( Aphilin ). Release mummies near infested plants, because Aphelinus abdominalis is not very mobile Spread material on rock [...] Aphelinus abdominalis is a parasitic wasp for the biological control of various aphid species. The parasitic wasp Aphelinus abdominalis is used for the biological [...] for advice on the best strategy for your situation. Best conditions for use of Aphelinus abdominalis The parasitic wasp Aphelinus abdominalis is effective

Root rot of carrot

an olive-green mycelium can develop on the surface. Initially, the disease forms circular to irregular spots on the leaves that vary in colour from grey [...] spots 0.5 -1.2 cm diameter 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 [...] or alternate hosts and transfer to annual crops. As far as is known, Daucus carota (carrot) is the only host plant of the fungus. How to prevent root rot

Bacterial wilt, brown rot

adventitious 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 [...] irrigation water. Disease incidence is highest when soil moisture is high, such as during rainy periods. When temperature is low, infection may remain latent [...] General Ralstonia solanacearum is a plant pathogenic bacterium. It is a soil-borne disease and colonises the xylem, causing bacterial wilt and brown rot

Less use of chemical pesticides due to Natutec Scout

Volgering, Scout at Schreurs, explains: “Scouting is very important within this cultivation. This is why we not only conduct a weekly count of all sticky [...] and disease development. Of particular note is the utilization of the 'Heatmap' feature, wherein colors on the company's map indicate the severity of the [...] Excel sheets with rows full of scout data about disease and pest pressure is over for good at Scheurs in De Kwakel since they switched to Natutec Scout

Cottony soft rot

the naked eye and look like rat droppings. The symptoms may occur on stems but also on leaves, fruits and pods. Root infection often leads to premature [...] usually only mycelium is produced by the germinating sclerotia. The fungus grows quite rapidly inside the plant and kills the host cells. On the infected plant [...] General Sclerotinia sclerotiorum, also known as cottony soft root, is a plant pathogenic fungus. It has a very wide range of host plants. Damage symptoms

Aphidius ervi

Aphidius ervi is available in a bottle ( Ervipar ). Spread the material on rock wool slabs or in Diboxes Make sure the material remains dry and is not moved [...] period when aphid infestation is expected. Consult a Koppert advisor or a recognized distributor of Koppert products for advice on the best strategy for your [...] ervi The parasitic wasp Aphidius ervi is most effective between 20 and 25°C (68 and 77°F). This natural enemy is not effective at temperatures above 30°C/86°F

Early blight

only known stage in all Alternaria species is the asexual stage. Conidia and mycelium overwinter in the soil and on crop residues and cause primary infection [...] veins. Lesions can easily rupture. Other symptoms are brown lesions on stem and foot. On fruits, dark sunken, leathery lesions occur at the side of the stem [...] blight of 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

Greenhouse whitefly

es: If the population is very large, feeding on plant sap can affect the physiology of the plant, as a result of which growth is retarded. In full sunlight [...] and the excess is excreted as honeydew, with larger larvae expelling large quantities. The damage that whiteflies cause to a crop is the result of sucking [...] The honeydew deposited on fruit makes it sticky. Dirt adheres to the fruit, and the growth of sooty moulds ( Cladosporium spp .) is encouraged, making it

Impatiens thrips

Pupation occurs on the leaf rather than on the ground. The prepupae and pupae remain immobile on the leaf tissue. Adults are found on both upper- and [...] sweet pepper, cucumber and eggplants. It lives exclusively on the leaves and is often present on weeds in greenhouses. Life cycle and appearance of Impatiens [...] from egg to adult on the plant, specifically on the leaves. Eggs are deposited in the leaf tissue, while subsequent stages are found on the upper- and undersides