Woolly apple aphid

trees sheltering in cracks and under loose bark. The nymphs become active in late March or April (in the northern hemisphere) and around the end of May, large [...] aphids are produced in summer. Winged egg-laying females are produced in early autumn but their eggs do not develop. Contrary to the situation in America [...] females of the woolly aphid are 1.2-2.6 mm long, purplish brown and covered by masses of white, mealy wax. The siphunculi are pore-like and the cauda is

Fusarium spp.

branch off the tap root. F. oxysporum grows inside the roots towards the foot of the plant and enters the vascular system. Inside the vessels, the fungus produces [...] stop the fungus from spreading. This gum blocks the xylem and causes the wilting which is the main symptom of this Fusarium species. Higher up in the plant [...] causes foot and/or root rot of the infected host plant, and the disease may manifest as wilting, stunting and chlorosis or lesions on the stem and/or leaves

Rice

for a large part of the world population, especially in Asia. Rice is a monocotyledon and is usually cultivated as an annual plant. In tropical climates [...] perennial and can produce a ratoon crop for as long as 30 years. The edible seeds of the plant (caryopsis) are usually between 5-12 mm (0.20–0.47 in) long [...] actually the seed of two particular species of grass: Oryza sativa (Asian rice) or Oryza glaberrima (African rice). Rice is a serial grain and the most popular

Knowing & recognizing

in 2003, the latest edition comprises 443 pages, 700 photographs, and dozens of illustrations of the most prevalent pests, diseases and their natural enemies [...] how they spread in the crop, the damage they can cause, and specific behavioural characteristics. Shop now Koppert - A knowledge company The use of biological [...] edition of Knowing and recognizing also includes new biopesticides and biostimulants that increase the plant’s resilience to stress and help the plant to grow

Flowering potted plants

of flowering potted plants, the most common species are: Poinsettia is well known and popular for its large red, white and green leaves, especially around [...] grown indoors and are used as ornamental houseplants in countries with colder climates. Kalanchoe is a tropical, succulent flowering plant and a genus that [...] around Christmas. Begonia is a perennial flowering plants and belongs to the family of Begoniaceae . The genus consists of 1,795 different plant species. Some

Cotton aphid

including the cucumber mosaic virus. Nymphs and adults extract nutrients from the plant and disturb the balance of growth hormones. As a result, the plant’s [...] if the infestation occurs early enough in the season, the death of young plants. Retarded growth and defoliation reduce yield. Plant sap is rich in sugars [...] pepper and many ornamental plants such as chrysanthemum and kalanchoe. The cotton aphid ( Aphis gossypii ) is distributed throughout the world but prefers

Fusarium head blight or scab

cycle and appearance of Fusarium head blight or scab Most Fusarium species only make asexual spores. Some also produce ascospores. In general, most Fusarium [...] primarily infects the older, lower leaves. The spores are dispersed upwards to the ears by splashing rain drops or wind. On the infected ears, the typical pink [...] structures, tools and machinery. Primary infection is either seed-borne or takes place as infection of the roots at the root tip or in small wounds, for

Experience Centre

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 [...] Experience Centre and discover the world of sustainable cultivation If you are interested in sustainable cultivation, biological crop protection , and natural [...] pollination, come and visit the Koppert Experience Centre where you can take an interactive journey through the fascinating world of sustainable cultivation

Verticillium wilt

produces gum in the vessels. The presence of both the fungus and the gum causes the xylem vessels to get blocked, which in turn causes the plant to wilt [...] species mostly cause wilting of plants. The wilting starts at the lower leaves. These leaves are pale-green, then orange-yellow. In the beginning the plant [...] distinct than the discolouration caused by Fusarium . The root system usually stays mostly intact. In rose, branches die off from the top and purple brown

Leaf stripe

gradually extend and become brown and chlorotic and may merge. Eventually this leads to the death of the leaf. The leaf splits at the end which makes it look [...] first occur on the first, second and third leaf and subsequently on other leaves. Yellow stripes are formed at the base of the leaf and the leaf sheath. [...] may be stunted and heads may be distorted and failing to emerge from the sheath. Ear length and the number of kernels may be reduced and kernels may be