A preliminary model to simulate the effect of insecticides on a spider-leafhopper system in the paddy field
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On the basis of life-table studies of the green rice leafhopper,Nephotettix cincticeps Uhler, a descriptive model was constructed to simulate the life system of leafhoppers in the paddy field.
Computer simulation demonstrated the existence of an optimum ratio of predators to prey in utilization of spiders for the control of leafhoppers. Also the population density ofLycosa which prey upon leafhoppers appears to determine the feasibility of controlling leafhoppers with reduced number of applications of selective insecticides. The increase of leafhoppers after application of non-selective insecticides was also simulated by the proposed model.
KeywordsPaddy Field Instar Nymph Rice Dwarf Virus Rice Pest Rice Stem Borer
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- Kawahara, S., K. Kiritani andT. Sasaba (1971) The selective activity of rice-pest insecticides against the green rice leafhopper and spiders. (In Japanese with English summary)Botyu Kagaku 36: 121–128.Google Scholar
- Kiritani, K., S. Kawahara, T. Sasaba andF. Nakasuji (1971) An attempt of rice pest control by integration of pesticides and natural enemies. (In Japanese with English summary)Gensei 22: 19–23.Google Scholar
- Kiritani, K., T. Inoue, F. Nakasuji, S. Kawahara andT. Sasaba (1972b) An approach to the integrated control of rice pests: Control with selective, low dosage insecticides by reduced number of applications. (In Japanese with English summary)Jap. J. appl. Ent. Zool 16: 94–106.Google Scholar
- Sasaba, T. andK. Kiritani (1972) Evaluation of mortality factors with special reference to parasitism of the green rice leafhopper,Nephotettix cincticeps Uhler.Appl. Ent. Zool. 7: 83–93.Google Scholar
- Takahashi, Y. andK. Kiritani (in press) The selective toxicity of rice-pest insecticides against insect pests and their natural enemies.Appl. Ent. Zool. Google Scholar