Rice pest constraints in Tropical Asia : characterization of injury profiles in relation to production situations

2000

Article

Savary Serge, Willocquet Laetitia, Elazegui F.A., Teng P.S., Pham Van Du, Zhu D., Tang Q., Huang S., Lin X., Singh H.M., Srivastava R.K.

Plant Disease, 2000, 84 (3), p. 341-356 ISSN 0191-2917

A protocol for characterizing patterns of rice cropping practices and injuries due to pathogens, insects, and weeds was developed and used in six sites in tropical Asia covering a wide range of environments where lowland rice is cultivated. The data collected in a total population of 456 individual farmers' fields were combined to site-specific weather data and analyzed using non-parametric multivariate techniques : cluster analyses with chi-square distance and correspondence analyses. The main results are : (1) patterns of cropping practices that are common across sites can be identified ; (ii) conversely, injury profiles that are common across sites can be determined ; (iii) patterns of cropping practices and injury profiles are strongly associated at the regional scale ; (iv) weather patterns are strongly associated with patterns of cropping practices and injury profiles ; (v) patterns of cropping practices and injury profiles allow for a good description of the variation in actual yield ; and (vi) patterns of cropping practices and injury profiles allow for a good description of the variation in actual yeild; and (vi) patterns of cropping practices and injury profiles provide a framework that accurately reflects weather variation and site diversity, and reliably accounts for variation in yield. The mean estimated yield across sites (4.12 t/ha) corresponds to commonly cited averages in the region and indicates the potential for increased productivity with better management practices, especially an improved water supply. Injuries due to pests are secondary compared with other yield-limiting factors. Injury profiles were dominated by stem rot and sheath blight (IN1) ; bacterial leaf blight, plant hoppers, and leaf folder (IN2) ; and sheath rot, brown spot, leaf blast, and neck blast (IN3)... (D'après résumé d'auteur)

Maladies des plantes [076MALPLA] ; Ravageurs des plantes [076RAVPLA]

RIZICULTURE ; INSECTE NUISIBLE ; MALADIE DES PLANTES ; FACTEUR DE RENDEMENT ; PESTICIDE ; REPARTITION GEOGRAPHIQUE ; PRATIQUE CULTURALE ; VARIETE ; VARIATION SAISONNIERE ; ANALYSE DE CORRESPONDANCE ; CLASSIFICATION ; ETUDE REGIONALE

ZONE TROPICALE ; ASIE ; PHILIPPINES ; INDE

Fonds IRD [F B010021009] ; Montpellier (Centre IRD)

fdi:010021009