The term weedy rice generally includes all the species of genus Oryza which behave as rice and which crop in rotation with rice weeds. Weedy rice populations have been reported in many rice- growing areas in the world where the crop is directly seeded. Even though weedy rice belongs to different species and subspecies, all these plants share the ability to disseminate their grains before rice harvesting. Weedy plants can also adapt to a wide range of environmental conditions. Weedy rice grains frequently have a red pigmented pericarp and it is for this reason that the term ‘red rice’ is commonly adopted in international literature to identify these wild plants. This term, however, does not seem very appropriate as red-coat grains are also present in some cultivated varieties, but also absent in various weedy forms. In most rice areas the spread of weedy rice became significant mainly after the shift from rice transplanting to direct seeding, and has started to become very severe over the last 15 years, particularly in European countries, after the cultivation of weak, semi-dwarf indica-type rice varieties. The spread has generally been favoured by the planting of commercial rice seeds that contain grains of the weed. Weedy rice infestations are reported for 40-75 percent of the rice area in European countries, 40 percent in Brazil, 55 percent in Senegal, 80 percent in Cuba, and 60 percent in Costa Rica.

Weedy rice. Biological features and control

FERRERO, Aldo
2003-01-01

Abstract

The term weedy rice generally includes all the species of genus Oryza which behave as rice and which crop in rotation with rice weeds. Weedy rice populations have been reported in many rice- growing areas in the world where the crop is directly seeded. Even though weedy rice belongs to different species and subspecies, all these plants share the ability to disseminate their grains before rice harvesting. Weedy plants can also adapt to a wide range of environmental conditions. Weedy rice grains frequently have a red pigmented pericarp and it is for this reason that the term ‘red rice’ is commonly adopted in international literature to identify these wild plants. This term, however, does not seem very appropriate as red-coat grains are also present in some cultivated varieties, but also absent in various weedy forms. In most rice areas the spread of weedy rice became significant mainly after the shift from rice transplanting to direct seeding, and has started to become very severe over the last 15 years, particularly in European countries, after the cultivation of weak, semi-dwarf indica-type rice varieties. The spread has generally been favoured by the planting of commercial rice seeds that contain grains of the weed. Weedy rice infestations are reported for 40-75 percent of the rice area in European countries, 40 percent in Brazil, 55 percent in Senegal, 80 percent in Cuba, and 60 percent in Costa Rica.
2003
FAO PLANT PRODUCTION AND PROTECTION PAPER - Weed Management for Developing Countries
FAO
120 -Addendum 1
89
107
9789251050194
http://www.fao.org/docrep/006/y5031e/y5031e00.htm#Contents
A. Ferrero
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/81974
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