二化螟蚁螟在不同类型水稻品种上的存活率及寄主选择性

二化螟Chilo suppressalis Walker是我国主要水稻害虫之一,近年来发生量呈上升趋势.本文研究表明二化螟蚁螟在不同类型水稻品种上3d的存活率不同.在两优培九上,3d的存活率最高,为60.8％.其次为南京11,其存活率为45.8％；在南粳44、武运粳7号、常优3号、武育粳3号和香糯8333上3d的存活率与南京11差异不显著,为40.0％ ～45.0％.在Ⅱ优084上蚁螟3d的存活率最低,只有25.8％.蚁螟对不同类型水稻品种的选择性也有差异.在8个水稻品种中,蚁螟对杂交籼稻两优培九的选择性最高,圆盘法测定其选择率为21.0％；Y型嗅觉仪法测定结果与圆盘法一致,在所有组合中蚁螟对两优培九的选择率均大于50.0％,明显高于常规籼稻和粳稻.蚁螟对南粳44(16.5％)和南京11(15.5％)的选择性仅次于两优培九,其后为常优3号(13.5％).对香糯8333的选择性最低,圆盘法测定其选择率仅有5.6％.进一步利用SPSS软件回归分析蚁螟在不同水稻品种上3d的存活率和对该品种的选择性,发现二者间存在明显的正相关关系.

The relationship between selection and survival of newly-hatched Chilo suppressalis larvae feeding on different varieties of rice

The stem borer, Chilo suppressalis Walker is a major rice pest in China and its numbers have been trending upward. We found that the survival rate of newly-hatched C. suppressalis larvae was highest on Liangyoupeijiu （60. 8% ）, intermediate on Nanjing 11 （45.8%） , and lowest on 11 you 084 （25.8%）. There was no significant difference in the survival rate of larvae feeding on Nanjing 44, Wuyunjing 7, Changyou 3, Wuyujing3 and Xiangnuo 8333, although survival rates were all more than 40. 0% on the first four varieties and only 35.8% in Xiangnuo 8333. Newly-hatched larvae displayed clear preferences for the eight varieties of rice. Liangyoupeijiu （hybrid indica rice ） was the most preferred with 21.0% preference determined by the disk method and 〉 50. 0% in Y-olfactometer experiments. The least preferred was Xiangnuo 8333 （5.6%）. Preferences for Nanjing44, Nanjingll and Changyou 3 were 16.5% , 15.5% and 13.5%, respectively. Regression analysis indicated that larval survival rates were positively correlated with the preference ranking of the rice variety they were raised on.