Black rot is considered the most important disease of crucifers across the world and can attack its host at any stage of growth. Cauliflower and cabbage are the most readily affected crucifer hosts and suffer significant yield loss as a result of the disease. On cabbage, black rot causes yellow to brown V-shaped lesions to develop on the edges of leaves and move inwards towards the midrib. As the disease progresses, the lesions turn darker, and leaves may wilt and fall from the plant. In the advanced stages of the disease, veins in the affected area will darken.
The disease is causes by a bacteria, Xanthomonas campestris pv. campestris, which can be spread via wild hosts, water or, most commonly, infected seed. Even symptomsless plants may produce infected seed so it is important to try to source certified disease-free seed before planting. For more information about how to control this disease, read September’s Factsheet of the Month, Control of Black Rot in Cabbage, which has been written by staff from the Ministry of Agriculture in Grenada.
Here’s a taste of some of the latest stories about plant health, including the risk of invasive pests spreading across Africa as a consequence of irrigation, research into genetic markers for disease resistance and salt tolerance of rice in Vietnam, and farmers in Honduras adopting sustainable methods to deal with increasing drought.
En junio 2015, se confirmó la presencia del hongo de la Moniliasis del cacao en Alto Beni, Departamento de La Paz a donde 85% de la producción de cacao es producida por aproximadamente 3000 pequeños y pequeñas agricultores. Este hongo (Moniliophthora roreri) es limitado en 13 países de América Latina y causa pérdidas importantes por los productores y productoras. Los síntomas característicos del hongo en los frutos incluyen madurez prematura, deformación, lesiones largas de color marrón y necrosis interna de los tejidos.
Para mantener un cultivo sano y prevenir la dispersión del hongo, revise la Lista Verde sobre la Moniliasis del cacao o para más detalles técnicos revise la Hoja técnica de Plantwise. Si se detecta los síntomas en regiones libres de la enfermedad, contacte el Ministerio de Agricultura de su país para recomendaciones de control locales.
We’ve selected a few of the latest new geographic, host and species records for plant pests and diseases from CAB Abstracts. Records this fortnight include the first report of Beet western yellow virus on pepper in China, the first report of Botrytis cinerea causing blossom blight on Japanese plums in Chile and the first report of lethal necrosis disease associated with co-infection of finger millet with Maize chlorotic mottle virus and Sugarcane mosaic virus in Kenya.
Here’s a taste of some of the latest stories about plant health, including the potential impact of climate change on food security in Sub-Saharan Africa, the use of biocontrol to manage fruit fly in Kenya and the impact of Fusarium on banana production in Honduras.
Today, we are celebrating the publication of the 1000th Plantwise Factsheet for Farmers (PFFFs) on the Plantwise knowledge bank!
PFFFs are written by trained partners in Plantwise countries around the world. Each factsheet provides information on how to recognise the problem, some background details about the problem and offers effective management advice to enable the problem to be controlled. After peer review, the factsheets go through technical validation to ensure that the factsheets offer management advice that is scientifically sound, and safe and practical for a farmer to implement. Once finalised, PFFFs are distributed to plant clinics where they are used to support extension workers in providing farmers with the best possible crop protection recommendations. This makes PFFFs a key resource in preventing crop losses to pests and diseases, boosting food security and improving livelihoods.