Cotton aphid

early enough in the season, the death of young plants. Retarded growth and defoliation reduce yield. Plant sap is rich in sugars, but has a low protein [...] extract nutrients from the plant and disturb the balance of growth hormones. As a result, the plant’s growth is retarded giving rise to deformed leaves or, if [...] need to extract large quantities of sap to get sufficient protein. The excess sugar is secreted in the form of honeydew, making the crop and its fruit

Black vine weevil

hatching, but grow to approximately 12 mm. A larva is often curled into the typical C-shape which it assumes whenever it is disturbed. The body is covered with [...] Otiorhynchus sulcatus is parthenogenetic a single female is enough to start a new population. [...] sulcatus, is a pest in many ornamental crops (e.g. rhododendron, cyclamen and azalea), as well as in strawberries and other fruit crops in both temperate

Buckthorn-potato aphid

nasturtii , has a nearly cosmopolitan distribution and is a major pest of potatoes, where it also transmits viruses. It also attacks a large number of [...] otato aphid Aphids have a complex life cycle, with both winged and wingless forms of adults and a great variety in colour. In greenhouses, reproduction [...] usually found in the lower parts of the plants and are not very mobile. In autumn, winged males and females are produced, which return to the primary host

Glasshouse potato aphid

sweet pepper it secretes a toxic substance, which leads to deformations in the growing tip of the plant. Precisely where the plant is pierced is unimportant [...] with a brown head, a dark thorax and a dark abdomen that has pale to dark transverse bands. The body shape is similar to wingless females, but is 2.0-3 [...] aphid Aphids have a complex life cycle, with both winged and wingless forms of adults and a great variety in colour. When reproduction is asexual, the young

Cannabis aphid

General Although it was first described in 1860, the cannabis aphid ( Phorodon cannabis ; a.k.a. bhang aphid or hemp aphid) is a very new pest to North America [...] ( Phorodon humuli ), to the point that microscopic analysis of the head is required to distinguish them. The hop aphid is common in North American hops [...] America. It was first seen on cuttings originating from Colorado in 2016 and is now widespread throughout that state and Oregon. Its range also includes several

Roots Growers positive about Mycotal against whitefly

segment is plant protection in particular a crucial factor. ‘We obviously want our cultivation to be as organic as possible. It has to be, as there’s only one [...] chemical product against whitefly in tomato that is effective and, unlike other products, also has a low MRL, which is a requirement for small cherry tomatoes [...] from week 34 to week 31 inclusive. ‘It never gets cold in there, so the level of infestation is higher and whitefly levels are high earlier in the year. We

Quad

the bumblebees to calm down Protect the hives from direct sunlight and rain, and weigh down the hive for example with a stone, to prevent it from blowing [...] flowers while at the same time collecting pollen to feed the brood. More workers emerge from the brood in the weeks after the introduction, increasing both [...] pollination performance. After some weeks the colony will reach its maximum size and starts declining in size and pollination activity. Colony development depends

Entonem keeps young orchids free from fungus gnats

compatible with a Dosatron. But since Koppert changed the formulation, it works perfectly.’ It is important to apply it correctly, he says. ‘It’s a careful balancing [...] 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 drops [...] allowed to go wrong during the propagation phase; our buyers operate a zero-tolerance policy. To make it possible for them to start with a clean plant, we

Bacterial canker of tomato

infection is mostly from infected propagation material. It spreads to other seedlings by touching the plants in greenhouse crops and by water in field crops [...] bacteria infect the new plants by entering through wounds and then growing into the vessels of the plant. Plant growth is inhibited and the plant wilts because [...] General Clavibacter is a quarantine organism in Europe, which means that strong efforts are used to prevent the bacterium from entering. When the occasional

Phytoseiulus persimilis

outbreak is quickly and effectively dealt with, but the disadvantage is that it disappears rapidly in the absence of suitable prey. When prey is in short [...] persimilis is sensitive to relative humidity below 70%. Phytoseiulus persimilis in bottles The predatory mite Phytoseiulus persimilis is available in a bottle [...] except for the resting period in the larval and nymphal stages. On plants, the oval eggs are usually deposited close to, or in a spider mite colony. They are