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 [...] lesions with vague borders and white fluffy fungal growth on the leaves. The centre is grey-brown with a light-green edge. On the stem, elongated brown lesions [...] between 15 and 23 °C and higher water content than is optimal for crop growth. Phytophthora overwinters in roots, infected tubers and bulbs or in the soil in

Understanding Orius

it preventatively and wanting them to establish, it is best not to apply Thripor from the end of September to the end of March of the following year (between [...] pepper and eggplant flowers, the adults and older nymphs can easily be found in crop flowers, where they are feeding on thrips and pollen. Adults and their [...] works fine). Mark the introduction point(s) within the crop and/or on the scouting maps, along with date of application. Check the marked areas starting

Downy mildew of Cucurbits

downy mildews, the optimum temperature is around 15 o C and the closer the temperature is to this, the shorter the leaf wetness period that is required. Inside [...] yellow and then turn brown. On the underside of the leave fluffy growth appears which is first white and later turns grey-brown. This is actually the sporulation [...] directly and the germ tubes infect the plants either through the stomata or directly by penetrating the cuticula. For germination free water is required

Bacterial wilt, brown rot

s roots on the stem. The vascular stem tissue is coloured brown and when the stem is cut, bacterial slime oozes from the wound. This is the way to distinguish [...] st organism in the United States. It is a commonly found soil-inhabitant in tropical and subtropical regions and is transferred by the introduction of [...] Ralstonia solanacearum is a plant pathogenic bacterium. It is a soil-borne disease and colonises the xylem, causing bacterial wilt and brown rot in a very

Canadian Thrips in Greenhouses & Grow Rooms

treatments. As the pest is dormant and protected in the hard pupal casing it is extremely resistant to pesticide treatments. Vents - The other way that [...] thrips, the main thing to look for in the adults is their light-yellow legs and their black-darkish brown coloring. The adults are poor fliers and tend to [...] on the foliage, attacking the lower surface first. When the population increases and feeding progresses, they will move to the upper surface of the plants

Fusarium wilt

may occur and cause different symptoms. Fusarium oxysporum is the only Fusarium that actually grows inside the vessel system of the host plant and spreads [...] blight in cereals and post-harvest decay. Fusarium oxysporum is the species causing vascular wilt. First the leaves turn yellow and wilt, mostly on one [...] one side of the plant. Finally, the whole plant wilts. Other symptoms are brown discolouration of the xylem vessels which can be seen when the stems are

Powdery mildew

pepper, the fluffy colonies occur mostly on the underside of the leaf, because the fungus infects the plant by entering through the stomata and there are [...] Leveillula taurica ) is through the stomata and the fungus grows inside the leaf. Later, the conidiophores in this case also protrude from the stomata. Conidia [...] outdoor grown rose and other Rosaceae , the fungus causing powdery mildew is extremely sensitive to water and ‘hides’ on the underside of the leaves. Therefore

Monitoring

Crazy roots, hairy roots, crown gall

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 [...] of the plant resulting from the Rhizobium infection. Rhizobium rhizogenes puts a Ri-plasmid in the plant tissue and causes a genetic change in the plant [...] Agrobacterium vitis, Agrobacterium rhizogenes and Agrobacterium rubi, n ow the first part of the name is changed to Rhizobium. Rhizobium rhizogenes or

Limonica

Turn and shake bottle gently before use Push the centre of the cap to open the dosage hole Carefully sprinkle material on leaves Make sure the material [...] or Natutec Airobug Dosage The dosage of Limonica depends on climate, crop and pest density and should always be adjusted to the particular situation. Start [...] species of thrips (first and second larval stages); eggs and larvae of greenhouse whitefly ( Trialeurodes vaporariorum ) and tobacco whitefly ( Bemisia