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CTA. 1989. Cassareep. Spore 21. CTA, Wageningen, The Netherlands.
Permanent link to this item: http://hdl.handle.net/10568/45066
A by-product of cassava pressing is now being used to control nematodes. This is cassareep (or 'manipueira'), a liquid that contains high levels of hydrocyanic acid. It is produced when cassava roots are pressed to make flour and extract starch....
A by-product of cassava pressing is now being used to control nematodes. This is cassareep (or 'manipueira'), a liquid that contains high levels of hydrocyanic acid. It is produced when cassava roots are pressed to make flour and extract starch. Tests have shown that cassareep is both more effechve and more economical than commercial nematocides:it can eliminate serious infestahons completely. The varieties of cassava which yield the most effective nematocide are the 'sour'ones, which contain lower concentrahons of hydrocyanic acid than the 'sweet' or table cassavas. Cassareep should be applied as soon as possible after Its extrachon, although it can be kept in a plastic container for up to three days before its effectiveness is seriously reduced. For greater economy it can be diluted with as much as one part water to one part cassareep, without reducing any of its nematocidal properties. Four litres of this dilute mixture (i.e. two litres of cassareep mixed with two of water) applied from any simple watering-pail will treat one square metre of infested soil. The treatment is most effective when used on soil that has been prepared for plantng. The farmer must then wait 20 days before sowing or transplanhng because of the possible toxic effects of the cassareep on plantlets. Once the plants are established, cassareep can be applied between crop rows, after the alleys have been weeded. But applying the nematocide at this stage will be less effective because the nematodes hide in the roots of the crop. For more details, contact: Professor J Julio da Ponte - Universidada Federal de Ceara - Caixa Postal 354 60000 Fortaleza CE- BRAZIL