The population characteristics of the brown plant hopper, Nilaparvata lugens, in the Philippines

Abstract. 1. Population characteristics of the brown planthopper, Nilaparvata lugens (Stål), were investigated over eight growing seasons on rainfed rice in the Philippines.
2. Three nymphal generation peaks were observed in most seasons. The third peak was not always the largest and peaks varied considerably in size from season to season.
3. Generation peaks were less distinct at a second sampling site within an irrigation system, possibly associated with increased asynchrony of planting and the consequent increased immigration potential.
4. Mortality was highest for eggs and first instar nymphs. Egg to adult survivorship was estimated as 1–12%.