Caterpillars

to crops. The most harmful caterpillars that occur in greenhouses belong to the Noctuidae (the noctuid or owl moths), which is the largest of all lepidopteran [...] greenhouse crops is the leafroller family, the Tortricidae. The name ‘leafroller’ refers to the fact that the caterpillars often live in rolled-up leaves [...] to detect and control. In addition to consumption of the plant, caterpillars also spoil the plant with the large quantities of frass they leave behind

Flies

for flies in your crop Fly damage Flies can cause damage to crops both directly and indirectly. The type of damage depends on the species of the flies. Direct [...] Ephydridae (shore flies). The larvae of these insects generally live on rotting plant material and are mostly found in the soil. The spotted wing drosophila [...] on soft fruits in Europe and North America. Sciarid flies and shore flies are mainly a problem in greenhouses. Their larvae live in the ground and prefer

Spider mites and other mites

such webs in which the mites live. The webbing and spotting on the leaves affect the appearance of the crop. This is of particular concern in ornamental [...] occur on the underside of leaves where they pierce the cells and suck out the contents. The empty dead cells become yellow, and in many plants the damage [...] damage can also be seen on the upper surface of leaves as small yellow dots. The destruction of cells results in reduced photosynthesis, increased transpiration

Laeveld_Agrochem_GROEI_20_-_Winter_2022.pdf

need to be tested in a lure in the field to confirm the behavioural activity of the compound(s) in the presence of various other volatile compounds naturally [...] Independence. The structure of both these varieties is the highest priority in years one through four. The structure is the base for the rest of the tree’s (and [...] es? Carbohydrates are the product of photosynthesis, the process where the leaves of trees produce soluble sugar in the form of sucrose (sugars) and starch

Better insights and digital advice with Natutec Scout

s, departments The grower can use the greenhouse editor in the Natutec Scout app to program in the actual layout of his greenhouse. The software then provides [...] major advantage of the Koppert app is the ability of the consultant to check up on things remotely – for Lema Tomaten, that’s the job of Koppert employee [...] few thrips in your plant, there is little to be concerned about – and little sense in the software reporting these kinds of measurement. The threshold value

Experience Centre

average of 1,5 hours and is suitable for groups of up to 15 visitors. In the case of bigger groups, the programme can be adapted in consultation. The Experience [...] you know that the vision of bumblebees differs vastly to that of humans and that we use that difference to provide our clients with the most effective [...] Visit our Experience Centre and discover the world of sustainable cultivation If you are interested in sustainable cultivation, biological crop protection

Fusarium spp.

inside the vascular system of the host plant and spreads upwards inside the plants. The other species are dispersed upwards on the outside of the plant [...] one side of the plant. Finally, the whole plant wilts. Other symptoms are brown discolouration of the xylem vessels, which can be seen when the stems are [...] ascospores. In general, the life cycle of different Fusarium species is similar. Fusarium overwinters for many years in the soil, and on crop residues of infected

Damping-off

during the night, but later the plants wilt irreversibly. 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 the plant turns brown. A typical symptom of a Pythium infection is the easy stripping of the skin from [...] at the start by using higher substrate blocks for the seedlings. In field crops: Avoid the use of fields with inadequate drainage or improve the drainage

Fusarium wilt

inside the vessel system of the host plant and spreads upwards inside the plants. The other species are dispersed upwards on the outside of the plant. [...] one side of the plant. Finally, the whole plant wilts. Other symptoms are brown discolouration of the xylem vessels which can be seen when the stems are [...] takes place as infection of the roots at the root tip or in small wounds, for example where lateral roots branch off from the tap root. How to prevent

Cottony soft rot

infects the stem base and the roots, whereas the ascospores infect the above-ground plant parts. In greenhouses, usually only mycelium is produced by the germinating [...] range of host plants. Damage symptoms The first symptoms of a cottony soft root ( Sclerotinia sclerotiorum ) infection are water-soaked lesions at the stem [...] base. The plant above it wilts and rots. White, fluffy fungal mycelium grows on the lesions, giving this disease its name cottony soft rot. In the mycelium