Buckthorn-potato aphid

symptoms Direct damage, caused by sucking of sap is rarely seen. Sometimes, large populations build up on potatoes or other hosts, which can cause growth [...] body length. The aphids overwinter as eggs on buckthorn. After emerging in spring, the aphids mainly feed on the underside of leaves of their summer hosts [...] potato aphid , Aphis nasturtii , has a nearly cosmopolitan distribution and is a major pest of potatoes, where it also transmits viruses. It also attacks

Stable fly

typically congregate on the legs of livestock to feed, and the population size can be assessed by counting the number of Stomoxys on the animals’ front legs [...] average number per leg is as low as two. When populations are very large (> 25 flies/leg), the insects will begin to cluster on the animals’ undersides [...] maggots ranging in size from 5–12 mm long, and they pass through three larval instars within 10–30 (or more) days, depending on the environmental conditions

Chrysopa

their body fluids. Visual effect Prey is sucked out, shrivelled skins are difficult to find. Chrysoperla carnea is active mainly during the night. The larvae [...] before use Apply on infested leaves For hotspot treatments, apply Chrysopa directly in the heavily affected areas The product can be applied on the rock wool [...] weekly intervals until control is achieved. Consult a Koppert advisor or a recognized distributor of Koppert products for advice on the best strategy for your

Entonem keeps young orchids free from fungus gnats

In the interim, the crop is treated with a bacterial preparation. Internal cultivation adviser Jan Mulder explains, ‘It is essential that we do something [...] over the young plants in a fine mist. This is followed by a second fine mist to rinse off nematodes that are on the leaves. A while later, I collect a few [...] Mulder. ‘Our dosages and introductions have therefore always been on the high side. It is better to use a little too much than not enough; infestations must

Municipality Venray: biological control of oak processionary caterpillars

Entonem is that nematodes kill fewer other caterpillars , which means they are less harmful to biodiversity. This is something that is high up on the political [...] positive. ‘The trees that we have treated have been 90% cleared. What is interesting is that avenues running east to west are typically free of oak processionary [...] Municipality of Venray a third of the tree stock in the area, some 11,000 trees, is oak. ‘We’ve been using Koppert’s nematode product Entonem as a curative measure

Pollination

Pollination is the transfer of pollen from the anthers of the flower to the stigma of the flower. If the pollen is transferred from anther to stigma on the same [...] flower it is called self-pollination. Cross pollination, is the transfer of pollen from the anther of one flower to the stigma of another flower on the same [...] What is pollination? Pollination is an annual challenge for growers when it comes to the production of vegetables, fruit and seed. Well pollinated crops

Limonica Ulti-Mite

us limonicus is most effective at temperatures between 13 and 25°C (55 and 77°F). It is not effective above 30°C (86°F). A. limonicus is sensitive to relative [...] after 4 weeks if the pest is not controlled. Consult a Koppert advisor or a recognized distributor of Koppert products for advice on the best strategy for [...] over a period of several weeks. Using their piercing mouthparts, they feed on prey by extracting its contents. The Ulti-Mite slow-release sachet, made from

American serpentine leaf miner

pea, bean and potato. In greenhouses, it is mainly found on gerbera and chrysanthemum. Today the insect is widespread across the whole world. Damage symptoms [...] The American serpentine leaf miner ( Liriomyza trifolii ) is highly polyphagous and thus lives on many host plants such as chrysanthemum, gerbera, gypsophila [...] cause damage to plants both directly and indirectly. The most direct damage is caused by the larvae mining the leaf tissue, leading to desiccation, premature

Yellow rose aphid

General The yellow rose aphid , Rhodobium porosum , is probably of North American origin but is now widely distributed in Europe, North Africa, parts of [...] result, the plant’s growth is retarded giving rise to deformed leaves. Retarded growth and defoliation reduce yield. Plant sap is rich in sugars, but has [...] protein. The excess sugar is secreted in the form of honeydew, making the crop and its fruit sticky. Black sooty moulds grow on this honeydew, contaminating

Nutari

low prey densities. Mode of action When density of the target pest is low and there is no alternative food available in the crop Nutari can be provided as [...] by sprinkling on the leaves by hand or with an Air(o)bug Large heaps of carrier material may cause leaf damage, so make sure the material is distributed [...] of Koppert products for advice on the best strategy for your situation. Environmental conditions Carpoglyphus lactis is tolerant to a wide range of conditions