Pierce's disease of grapevine

along the margin or the tip from early to midsummer. The necrotic area spreads over the leaf from the margin and is marked by a chlorotic band. In the beginning [...] In peach, the canopy of infected plants is compact and umbrella-like due to the shorter internodes. The foliage is denser and the leaves are a darker green [...] in the leaves to neighbouring peach trees with the bacteria mainly in the roots is much more successful than the other way around. In general, the low

Angular leaf spot

lesions on the underside of the leaf. They enlarge to angular spots, often limited by the small veins. The distinctive feature is the way the lesions look [...] that become the primary source of infection in the spring. The bacteria are also introduced in a crop in new transplants. This bacterium is very resistant [...] from the lesions on the leaves and form a secondary source of infection. They are dispersed by rain, irrigation water or handling of the plants. Infection

Dwarf bunt

sporidia infect the wheat seedlings even before emergence and the fungi grow inside the plants to the growing tip. The fungi grow between the plant cells and [...] controversa Dwarf bunt General Tilletia controversa is a plant pathogen. It is a fungus known to cause the smut disease TCK smut in soft white and hard red [...] harvest allowing the teliospores to fall to the ground. Additionally, these teliospores contaminate healthy kernels, which in turn become a source of disease

Charcoal rot

density of the microsclerotia in the soil is directly related to disease incidence. Within 24 hours the fungus infects the roots of the host by direct penetration [...] (outer tissue layer) to orange-brown to dark brown. Cutting the roots may show the same discolouration of the internal tissues of the main roots. In most [...] germ tubes. During the next two days, necrotic spots occur on the roots and the fungus spreads into the cortex and vascular tissue. In the infected host tissues

Bacterial canker of tomato

white with a brown centre. In potato, the disease usually only occurs in the second half of the season. The first symptoms are wilting of the lower leaves [...] then growing into the vessels of the plant. Plant growth is inhibited and the plant wilts because the xylem vessels become blocked. The bacterium can survive [...] Clavibacter is a quarantine organism in Europe, which means that strong efforts are used to prevent the bacterium from entering. When the occasional infection

Phytophthora blight

leaf wetness is required. Dispersal is by wind and rain causes the pathogen to be returned to the soil from infected plants. Dispersal in the soil happens [...] fungal growth on the leaves. The centre is grey-brown with a light-green edge. On the stem, elongated brown lesions occur, usually circling the stem. On potato [...] flagellae which enable them to move through water. Infection is usually from the root to the foot, but direct infection of the foot also occurs. Exudates

Citrus mealybug

so that the light yellow to pink body is visible through its waxy covering. There is often a darker longitudinal stripe running over the body. The adult [...] search for a new feeding place and are capable of moving a reasonable distance over the plant. The male nymph attaches itself to the plant, whereas the females [...] can be hard to spot. They are smaller than the females, have two pairs of wings and two long tail filaments. Their sole task is to fertilize the females and

Cotton bollworm

with a flattened base and a diameter of about 0.5 mm. They are at first a shiny yellowish white, with their colour changing to brown just before the larvae [...] caterpillars are yellowish-white to reddish-brown with dark spots. In later instars the head is mottled, and the body is marked with three prominent longitudinal [...] approximately 18 to 19 mm in length and have a wingspan of about 40 mm. The grey-green males are smaller. The forewings are edged with a line of black spots

Spider mites and other mites

covered with 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 [...] cause damage to the host plant by feeding on plant sap. They mainly occur on the underside of leaves where they pierce the cells and suck out the contents [...] videos Take a look at the video or go to our Youtube channel to see our spider mite control products in action. More spider mite control videos How to get rid

Crazy roots, hairy roots, crown gall

disease seems to be caused by a change in the hormonal system of the plant resulting from the Rhizobium infection. Rhizobium rhizogenes puts a Ri-plasmid [...] crown gall The primary source of infection by Rhizobium rhizogenes has not yet been defined. The assumption is that the bacteria survive in the soil, but [...] Disinfect the nutrient solution in order to prevent biofilm growth inside the irrigation system Prevent contact between the plant roots and the gutters in