• Root rot of carrot

  features hence is not easy to place it at the generic level. Årsvoll was the first to identify and describe the fungus in Norway, in 1965. An infection [...] the most prevalent black spot pathogens in Northwest Europe. Damage symptoms Rhexocercosporidium carotae is a slow-growing fungus that can infect both [...] the leaves that vary in colour from grey to almost black. The spots appear to be sharply defined, but under a magnifying glass it appears that the infected

• Predatory mites

  crops, using a blower for dispersion is an available option. This approach proves particularly effective when a swift response is required due to a pest invading [...] pests, so knowing the target pest is crucial. Scouting is essential to know where the pest is, how severe the infestation is and to identify the pest. Select [...] are similar to the adults in appearance, but smaller in size. Predatory mites are typically measuring only a millimeter in length. Their bodies are often

• Root and crown rot of strawberry

  areas in crown and root of strawberry. Plant development is slow, growth is retarded and rooting is poor. Transplants look weak and may die. It is hard [...] New diseases in strawberry have been ascribed to Pestalotiopsis clavispora in the case of root and crown rot (of strawberry), first found in The Netherlands [...] Pestalotiopsis longisetula in the case of leaf spots, such as leaf spot of strawberry and fruit rot reported mainly from Brazil. The genus is quite complex, so

• Spider mites and other mites

  control Learn more about What are mites? Plant mites are a diverse group of small arthropods that feed on plant sap. They are found in a wide variety of habitats [...] of plant mite has its own unique characteristics and feeding habits. Plant mites generally thrive in warm and dry conditions, which is why they are often [...] have eight legs. For these plant mites a magnifying glass is needed to detect them. Plant mites are often found in colonies on the undersides of leaves,

• Tobacco whitefly

  insect was first identified on tobacco in Greece in 1889, hence the name tabaci . It has subsequently been found in most tropical and subtropical countries [...] throughout the world. It causes damage in (sub-)tropical areas especially. The tobacco whitefly ( Bemisia tabaci ) is feared because of its high level of resistance [...] 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, leaves

• Pea blight, leaf and pod spot

  ) causes foot rot in peas, whereas Ascochyta pisi does occur sometimes at the stem base but is not part of the foot rot syndrome in peas. Infected seeds [...] General Ascochyta pisi is a fungal plant pathogen that causes A scochyta blight on pea (leaf blight or pea blight) and lesions of stems, leaves, and pods [...] sunken and surrounded by a dark brown to red-brown border. The first infection is often on the primary leaves. The fungus is seed borne and thus also causes

• Leaf miners

  Learn more about What are leaf miners? Leaf miners belong to the order Diptera (the true flies ) and form the family Agromyzidae. This is a family of small [...] species that cause damage in horticultural crops are mostly polyphagous; that is, they feed on many crops. However, this is not universal among the Agromyzidae [...] to burning in fruit such as tomato and melon. Loss of leaves also reduces yield. In full-grown plants of fruiting vegetable crops, however, a considerable

• Whitefly

  comparable in outline. Whitefly damage The larvae need a lot of nutrients for growth, and thus consume a large quantity of plant sap. This contains a high [...] physiology of the plant, as a result of which growth is retarded. In full sunlight, leaves can wilt and drop. Such leaf damage can in turn influence the development [...] fruit and lead to a reduction in yield. By sucking plant sap and secreting honeydew, whitefly reduces the aesthetic value of crops. This is particularly important

• Grapevine powdery mildew

  unlike most other grapevine pathogens, it does not require free water (such as rain or dew) to infect, making it a persistent threat throughout the entire [...] Grapevine powdery mildew (Erysiphe necator) is a widespread fungal disease that poses a serious threat to commercial viticulture worldwide. The pathogen [...] (Erysiphe necator) is closely synchronized with the vine growth stages and environmental conditions. Understanding its lifecycle is essential to implementing

• Carrot

  experiences About The carrot ( Daucus carota subsp. sativus ) is a root vegetable and comes in a variety of colours, ranging from the regular orange to black [...] originally produced for its seeds and leaves. Carrots can be classified as hardy biennials and are grown as annuals. Carrots can vary greatly in colour, shape and [...] and size. The shorter carrot types grow well in heavy soil, the longer varieties need loose and fertile soil.