Cassava rot

Maniok som har vokst i tørketid. Cyanogenicity of cassava varieties and risk of exposure to cyanide from cassava food in Nigerian communities. Journal of the Science of . Cassava Bufret Lignende Oversett denne siden Manihot esculenta is a woody shrub native to South America of the spurge family, Euphorbiaceae.

It is extensively cultivated as an annual crop in tropical and subtropical regions for its edible starchy tuberous root , a major source of carbohydrates.

Though it is often called yuca in Spanish and in the United States, it differs . Yield losses due to root rot average 0. This paper reviews previous work on cassava root rot and summarizes a few recent studies on . Root rot diseases of cassava are gradually becoming important in the major cassava producing regions of the country with high yield losses due to rots being reported regularly by farmers and Agriculture Extension Agents. Complete crop failure due to root rots have been observed in farms in different regions of the country. ABSTRACT: Although root rot is one of the major diseases affecting Brazilian cassava (Manihot esculenta Crantz.), little is known about the diversity of root rot pathogens.

In this study, diseased plants exhibiting root rot symptoms were collected from cassava -producing regions in five Brazilian states: Bahia, Sergipe, Paraíba . Soft rot of cassava (Manihot utilissima Pohl) was found to be caused by Lasiodiplodia theobromae (Pat.) Griff.

Trichoderma harzianum Rifai, Cylindrocarpon candidum (Link) Wollenw. Aspergillus niger van Tieghem and Aspergillusflavus Link. The organisms enter tubers through wounds, bruises and natural . Many different species of fungi are often isolated from rotted cassava root tubers and pathogenicity studies have often implicated Botryodiplodia theobromae and Fusarium solani as the major causal pathogens. Consequently, more attention has often been focused on Botryodiplodia theobromae and Fusarium solani with. The occurrence of Cassava tuber rot in regions of Kolli hills, Kollam, and Kottayam of South India, causes major economic loss up to in Cassava production.

The disease tuber is characterised by brown watery lesions with foul smell, making it unfit for further use. The sporangia of the pathogen were oval and ellipsoid . The development of cassava cultivars resistant to root rot (PRM) is a viable strategy for disease control. The objectives of this study were to identify stable sources of PRM resistance and to estimate genetic parameters. Inoculation with Fusarium spp. Fspp) species was performed in 6accessions and five . Cassava root rot disease is an increasing problem in Africa where yield losses of about have been recorded.

We evaluated 2African landraces and 3improved genotypes from the germplasm collections of the International Institute of Tropical Agriculture (IITA), for sources of resistance using root slice laboratory. The root -surface mycoflora of cassava were isolated from roots washed in serial changes of sterile distilled water and plated out on potato-dextrose agar. Unearthing a solution to cassava root rot.

During the past decade, Cassava mosaic disease (CMD) has been the focus of extensive collaborative research to understand the nature of the disease and to develop resistant varieties of cassava.

However, another disease, although currently confined to the East African coast, . Fusarium species are a significant component of the set of fungi associated with cassava root rot. Solution found for cassava root -rot devastation in Africa Dar es Salaam, Tanzania – Scientists of the International Institute of Tropical Agriculture (IITA) have developed varieties resistant to Cassava Brown Streak Disease (CBSD) in collaboration with their counterparts at the National Agricultural Research . Dry root rot Causal organism. Armillariella mellea (Vahl.) Pat.

Both of these pathogens have been recorded on cassava in different parts of the world. Symptoms of CRRD are quite variable depending on the causal agent and can be divided into dry, soft, and black rot. In general, dry rot is represented by the appearance of dark brown streaks in the roots with no . Among the diseases of cassava (Manihot esculenta Crantz), root and stem rots are important in different ecozones of West Africa. This study on the prevalence of cassava root and stem rot diseases was carried out in forest and wet savanna ecozones of Togo and the causing pathogens were isolate identified and .