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Pattern of immigration of the sorghum plant bug Stenotus rubrovittatus (Hemiptera: Miridae) into paddy fields from a large source habitat |
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| Authors: | Ai Takeda Mika Yasuda Ken Tabuchi Keiko Oku Wataru Sugeno Takayuki Mitsunaga Tetsuya Yasuda Tomonari Watanabe |
| Institution: | 1. Chiba Prefectural Agriculture and Forestry Research Center, 808 Daizenno, Midori, Chiba, 266-0006, Japan 2. Graduate School of Horticulture, Chiba University, 648 Matsudo, Chiba, 271-8510, Japan 3. NARO Agricultural Research Center, National Agriculture and Food Research Organization, 3-1-1 Kannondai, Tsukuba, Ibaraki, 305-8666, Japan 4. Plant Geography Lab, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences Menglun, Mengla, Yunnan, 666303, China 5. NARO Tohoku Agricultural Research Center, 4 Akahira, Shimo-kuriyagawa, Morioka, Iwate, 020-0198, Japan 6. Agricultural Production Corporation GRA Inc., Watari, Miyagi, 989-2201, Japan |
| Abstract: | Evaluation of the landscape-level movement of Stenotus rubrovittatus (Matsumura), a major rice pest in Japan, is essential for establishing management strategies. We assessed the immigration timing and the average dispersal distance from a bank slope covered with Italian ryegrass Lolium multiflorum Lam. to paddy fields by periodic sampling in two regions in Chiba Prefecture. The immigrant densities in paddy fields increased exponentially as they approached the bank slope as a large-scale habitat of the insect. The relationship between immigrant density and distance from the source habitat fit an empirical model and theoretical model well. The theoretical model estimated the average dispersal distance during immigration: that of females was 72.0 and 92.1 m and that of males was 122.0 and 112.9 m in the respective regions. In addition, the average dispersal distance of males increased 7 days or later after the rice heading date despite the steady dispersal distance of females. |
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