HomeInternational Rice Research Notesvol. 22 no. 2 (1997)

A Method for Estimating the Number of Eggs in Egg Masses of Yellow Stem Borer

A M. Romena | F. Gould | M B. Cohen

Discipline: Agriculture



Egg masses of yellow stem borer (YSB), Scirpophaga incertulas (Walker), are multilayered and densely covered with hair. Consequently, it is not possible to count the number of eggs in an egg mass, either before or after the eggs have hatched. This results in difficulties in many studies of YSB behavior and host plant resistance in which plants or plots are artificially infested with egg masses, and where interpretation of results would be more powerful if the number of larvae hatching from the egg mass was known. This study demonstrates the accuracy of a method of egg number estimation that we have developed, based on comparison of test egg masses with a “reference collection.”