Analysis of damage mechanisms by pests and diseases and their effects on rice yield : [proceedings of the SARP application workshop, held at the International Rice Research Institute, 18 April to 6 May 1994]

Yield loss due to the the rice yellow stem borer (Scirpophaga incertulas (Walker)) and other stem borer species was assessed, during the dry and wet seasons of 1986, and dry season of 1987, at the Suphan Buri Rice Experiment Station, Central Plain, Thailand. Variety RD7 was used, and the single hill and microplot methods in were applied in 1986 and 1987, respectively. Infestation was determined on 500 hills by counting the number of injured and healthy tillers per hill. Number of dead hearts per hill was counted at weekly intervals, starting at 35 days after transplanting (DAT) in the wet season, and at 24 DAT in the dry season, respectively, until 70 DAT. Grain yield per hill was determined. Observations were grouped into classes of the same stem borer damage. On the basis of these classes, regression functions that describe the relationship between the number of dead hearts per hill at three crop development stages, and fraction grain yield reduction, were derived.

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