|Title:||Occurrence and preference of Anagrus incarnatus Haliday (Hymenoptera: Mymaridae) on eggs of two rice planthdppers in Taiwan||Other Titles:||Anagrus incarnatus 之發生及對二種稻蝨寄主卵之偏好性||Authors:||B.H. Chen
|Keywords:||Rice;planthoppers;egg parasitoid;preference;Anagrus||Issue Date:||Dec-1993||Publisher:||植物保護學會||Journal Volume:||35||Journal Issue:||4||Start page/Pages:||267-275||Source:||植物保護學會會刊||Abstract:||
Field surveys were conducted in several, sites to study occurrence of Anagrus incarnatus Haliday and its parasitism on eggs of rice brown plant-hopper (BPH). A. incarnatus population increased with the increment of BPH at first and second cropping seasons. It peaked during the ripening stage of rice plants at about 46% parasitism at Si-chou in both cropping seasons. The host preference of A. incarnatus to eggs of Nilaparvata lugens Stal (BPH) and small brown planthopper, Laodelphax striatellus (Fallen) (SBPH) was determined in the laboratory by free- and no-choice tests. The parasitoid preferred BPH to SBPH eggs in a free choice test. More A. incarnatus foraged on rice plants infested with BPH eggs than those infested with SBPH eggs, and more A. incarnatus progeny emerged from BPH than from SBPH eggs. The relationship between BPH infesting densities and the emergent A. incarnatus is linear regardless if rice variety is suscep tible or resistant to BPH. The impact of the parasitoid on rice planthop pers is discussed.
本試驗於本省中部地區調查卵寄生蜂Anagrus incornotus Haliday之發生及對稻蝨之寄生率，結果顯示無論一、二期作，該蜂族群隨其寄主褐飛蝨密度之增加而上升，其寄生率之高峰在水稻成熟期，而以溪州之46％為最高。室內以自由選擇與無選擇試驗進行測定該蜂對褐飛蝨與斑飛蝨卵之偏好性，結果顯示該蜂對褐飛蝨卵俱偏好性，較喜在產有褐飛蝨卵之稻株上找尋寄主產卵，而較少於產有斑飛蝨卵之稻株上尋找。無論水稻品種為感蟲或較抗蟲者，該蜂羽化數與褐飛蝨接蟲密度呈直線關係。同時，自被寄生之褐飛蝨卵羽化之該蜂數，遠比自被寄生之斑飛蝨卵者為多。該蜂乃本省稻蝨之有效卵蜂。
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