| Publication Type: | Journal Article |
| Year of Publication: | 1992 |
| Authors: | Y. Suzuki, Raga, I. N., Nurusanti, S., Wadrawan, I. K. R. |
| Journal: | Proceedings of the Association for Plant Protection of Kyushu |
| Volume: | 38 |
| Pagination: | 73-77 |
| Keywords: | agricultural entomology, beneficial insects, biology, cereals, ecology, green rice leafhopper, hosts, insect pests, models, natural enemies, Nephotettix vir, parasitoid, parasitoids, pests, Pipunculidae, population dynamics, rice fields, simulation models |
| Abstract: | The effect of pipunculid parasitism on the population dynamics of the cicadellid Nephotettix virescens was studied in asynchronous rice planting areas of central Java and Bali, Indonesia. The parasitism of N. virescens adults was greater in migrant-producing, 1st and 2nd generations in paddy fields than in the other generations, which were mainly composed of immigrants from outside the area. These included populations obtained in seed beds, paddy fields 1-4 weeks after transplanting and ratoon fields 1-4 weeks after harvest. Since the parasitism occurred mainly in the nymphal stages, the above results indicated a suppression of migratory activities of parasitised N. virescens. The parasitism rate of 1st-generation adults was related positively to the adult density and negatively to the percentage of mature females among parasitoid-free females. The effects of a greater emigration rate of healthy adults on the parasitism rate of resident populations were analysed using mathematical models. The results showed that the role of pipunculid parasitism as a factor stabilising or destabilising population fluctuations of N. virescens was quite limited. |