Pourriture des racines

Class: champignons
Common Name: Pourriture des racines
Scientific Name: Rhizoctonia spp
Potential Host:

Eggplant, strawberry, pepper, tomato, basil, tarragon, mint, cabbage, cauliflower, pea, beans, soy, lettuce, cucumber, squash, melon, pumpkin, zucchini, watermelon, potato, carrot, beet, rice, sage, cucumber, radish, cotton, canola, wheat, barley, peanuts, corn, strawberry, turf grass, and tobacco

Who Am I?

Rhizoctonia is a common seed-and soil-borne fungus with significant saprophytic characteristics (feeds on dead organic matter). Rhizoctonia causes “damping-off” in cultivated fields, ornamental plants, and turf grass. The pathogen overwinters on plant residue and soil.

Several types of rhizoctonia attack plants and are known by their non-host specialization; in other words, they can affect many types of plants. One such specie is rhizoctonia solani, which is the causal agent of black scurf of potatoes, violet root rot in carrots, bare patch of cereals, root rot of sugar beet, belly rot of cucumber, and sheath blight of rice.

Rhizoctonia favors high humidity conditions and can develop in a broad-spectrum of temperatures: 10-32c. Rhizoctonia tends to occur within the short time frame adjacent to planting; the fungi attacks plants at the soil line. Easy to spot symptoms of Rhizoctonia are « damping off » and reduced seed germination. Infected seedlings exhibit red to brown lesions primarily at the stem base. Red-brown to black lesions will form on roots. With time, infected seedlings will wilt, while older, more mature plants will exhibit an increased tolerance to the disease.

Control Measures

Calendrier: Il est plus facile et plus rentable de surmonter les infestations au cours des premières étapes. Surveillez régulièrement le champ et recherchez les signes ci-dessus.

Diverses techniques peuvent être prises pendant la croissance des cultures pour réduire les risques d’infection et de propagation.:

* Conservez un espace adéquat : évitez les plantations trop denses afin de permettre à la lumière de pénétrer. Cela permet aux feuilles et aux fruits de sécher rapidement les jours humides.

* Assainissement Les débris végétaux doivent être enlevés pendant la culture. Désinfectez l’équipement qui entre en contact avec des plantes infectées. Ne laissez pas du matériel ou des travailleurs traverser le champ lorsque le feuillage est humide.

* Air Circulation : Dans les structures fermées, favoriser l’assèchement du feuillage et réduire la durée des périodes de mouillage en introduisant une zone ventilée avec des rideaux en filet.

* Drainage du sol : La présence d’eau stagnante favorisera la maladie.

* D’autres techniques de réduction de l’humidité comprennent le revêtement du sol avec des feuilles de polyéthylène afin de réduire l’évaporation du sol.

carbendazime, propiconazole, pencycuron, l’iprodione, et fludioxonil.

Trichoderma harzianum est un champignon utilisé comme fongicide et qui aide à prévenir la rhizoctonie.

Caution and careful notice should be taken when using any plant protection products (insecticides, fungicides, and herbicides). It is the grower’s sole responsibility to keep track of the legal uses and permissions with respect to the laws in their country and destination markets. Always read the instructions written on labels, and in a case of contradiction, work in accordance to the product label. Keep in mind that information written on the label usually applies to local markets. Pest control products intended for organic farming are generally considered to be less effective in comparison to conventional products. When dealing with organic, biologic, and to some extent a small number of conventional chemical products, a complete eradication of a pest or disease will often require several iterations of a specific treatment or combination of treatments.

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