1. Alam MZ (1967) Insect pests of rice in East Pakistan. In: The major insect pests of the rice plant. International Rice Research Institute, Johns, Hopkins Press, Baltimore, 643–655 pp
2. Andow DA, Kiritani K (1983) The economic injury level and the control threshold. Jpn Pestic Info 43:3–8
3. Anonymous (1980) Economic threshold. Aduthurai Reporter 4:139–140
4. Anonymous (1982) Insect pests of cereals. In: Insect pests and their control. Nat. Vishiva. Division of Entomology, Indian Agricultural Research Institute, New Delhi, India, pp 30–37
5. Aquino GB, Heinrichs EA (1985) Timing of insecticide applications in rice for economical control of the brown planthopper. J Plant Prot Trop 2:9–14