Life table analysis of the green rice leafhopper,Nephotettix virescens (distant) (Hemiptera: Cicadellidae), and efficient vector of rice tungro disease in asynchronous rice fields in Indonesia |
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Authors: | I Gusti Ngurah Aryawan I Nyoman Widiarta Yoshito Suzuki and Fusao Nakasuji |
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Institution: | (1) Crop Protection Center VII, Ministry of Agriculture, P.O. Box 88 Denpasar, Bali, Indonesia;(2) Laboratory of Applied Entomology, Faculty of Agriculture, Okayama Univeristy, 700 Okayama, Japan;(3) Directorate of Food Crop Protection, Ministry of Agriculture, Pasar Minggu, Jakarta, Indonesia;(4) Present address: Kyushu National Agricultural Experiment Station, Nishigoshi, 861-11 Kumamoto, Japan |
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Abstract: | Summary Population dynamics ofNephotettix virescens was studied in 17 paddy fields transplanted at intervals of about 1 month in 1988–1990. The adult density was highest either
in the immigrant or the 1st generation and sharply decreased to the 2nd generation. The survival rate of the 1st generation
was lowest in the transition season when areal population density increased. Key factor analysis revealed that the nymphal
and adult mortality of the 1st generation (kn) was the principal source of population fluctuations. No significant correaltion
was found between kn and natural enemy density, natural enemy density/healthy egg density, or the precipitation during the
nymphal period. On these bases adult emigration was suspected to be the key factor. Areal population build-up ofN. virescens in the transition season was considered to occur as a result of increasing immigration to young stages of rice.
Contribution from Indonesia-Japan Joint Program on Food Crop Protection (ATA 162), which was implemented by the Directorate
of Food Crop Protection, Ministry of Agriculture, Indonesia and Japan International Cooperation Agency, Japan. |
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Keywords: | Nephotettix virescens life table asynchronous planting population dynamics |
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